Thu, 06 Apr 2023 20:53:06 +0200
Set the new measured deep sleep current consumption. This is half of the Wemos D1 system.
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1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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1 | # Driver for **BME680** digital **environmental sensor** |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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changeset
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2 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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changeset
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3 | Forked from [original driver by Gunar Schorcht](https://github.com/gschorcht/bme680-esp-idf). |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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changeset
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4 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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changeset
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5 | The driver supports multiple BME680 sensors which are connected to the same or |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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6 | different I2C interfaces with different addresses. *SPI interface is not |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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7 | supported yet*. |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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8 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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9 | It is for the usage with the ESP8266 and [ESP8266 RTOS SDK](https://github.com/espressif/ESP8266_RTOS_SDK) |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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10 | or ESP32 and [ESP-IDF](https://github.com/espressif/esp-idf.git). |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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11 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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12 | ## About the sensor |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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13 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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14 | BME680 is an ultra-low-power environmental sensor that integrates temperature, |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
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15 | pressure, humidity and gas sensors in only one unit. |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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16 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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17 | ## Communication interface |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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18 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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19 | The BME680 sensor can be connected using I2C. |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
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20 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
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21 | The I2C interface supports data rates up to 1 Mbps (ESP-IDF limitation). It is |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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22 | possible to connect multiple BME680 sensors with different I2C slave addresses |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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23 | to the same I2C bus or to different I2C buses. Possible I2C slave addresses |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
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24 | are 0x76 and 0x77. |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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25 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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26 | ## Measurement process |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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27 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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28 | Once the BME680 has been initialized, it can be used for measurements. The |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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29 | BME680 operates in two different modes, the **sleep mode** and the |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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30 | **forced mode**. |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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31 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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32 | The sensor starts after power-up automatically in the *sleep mode* where it |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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33 | does not perform any measurement and consumes only 0.15 μA. Measurements are |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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34 | only done in *forced mode*. |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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35 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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36 | **Please note:** There are two further undocumented modes, the *parallel* and |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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37 | the *sequential* mode. They can't be supported by the driver, since it is |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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38 | not clear what they do and how to use them. |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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39 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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40 | ### Measurement cylce |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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41 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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42 | To perform measurements, the BME680 sensor has to be triggered to switch to |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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43 | the **forced mode**. In this mode, it performs exactly one measurement of |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
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44 | temperature, pressure, humidity, and gas in that order, the so-called |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
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45 | **TPHG measurement cycle**. After the execution of this TPHG measurement cycle, |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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46 | **raw sensor data** become available and the sensor returns automatically back |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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47 | to sleep mode. |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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48 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
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49 | Each of the individual measurements can be configured or skipped separately |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
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50 | via the sensor settings, see section **Measurement settings**. Dependent on |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
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51 | the configuration, the **duration of a TPHG measurement cycle** can vary from |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
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52 | some milliseconds up to about 4.5 seconds, especially if gas measurement is |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
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53 | enabled. |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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54 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
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55 | To avoid the blocking of the user task during measurements, the measurement |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
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56 | process is therefore separated into the following steps: |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
parents:
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57 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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58 | 1. Trigger the sensor with function `bme680_force_measurement()` to switch |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
Michiel Broek <mbroek@mbse.eu>
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59 | to *forced mode* in which it performs exactly one THPG measurement cycle. |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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60 | 2. Wait the measurement duration using function `vTaskDelay()` and the value |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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61 | returned from function `bme680_get_measurement_duration()` or wait as long |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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62 | as function `bme680_is_measuring` returns true. |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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63 | 3. Fetch the results as fixed point values with function |
1c9894662795
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64 | `bme680_get_results_fixed()` or as floating point values with function |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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65 | `bme680_get_results_float()`. |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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66 | |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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67 | ```C |
1c9894662795
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Michiel Broek <mbroek@mbse.eu>
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68 | ... |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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69 | // as long as sensor configuration isn't changed, the duration can be considered as constant |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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70 | uint32_t duration |
1c9894662795
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71 | bme680_get_measurement_duration(sensor, &duration); |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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72 | ... |
1c9894662795
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73 | if (bme680_force_measurement(sensor) == ESP_OK) // STEP 1 |
1c9894662795
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74 | { |
1c9894662795
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75 | // STEP 2: passive waiting until measurement results are available |
1c9894662795
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76 | vTaskDelay(duration); |
1c9894662795
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Michiel Broek <mbroek@mbse.eu>
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77 | |
1c9894662795
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78 | // STEP 3: get the results and do something with them |
1c9894662795
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79 | if (bme680_get_results_float(sensor, &values) == ESP_OK) |
1c9894662795
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80 | ... |
1c9894662795
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81 | } |
1c9894662795
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82 | ... |
1c9894662795
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83 | ``` |
1c9894662795
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84 | |
1c9894662795
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85 | Alternatively, busy waiting can be realized using function `bme680_is_measuring()`. |
1c9894662795
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86 | |
1c9894662795
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87 | ```C |
1c9894662795
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88 | ... |
1c9894662795
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89 | if (bme680_force_measurement(sensor) == ESP_OK) // STEP 1 |
1c9894662795
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90 | { |
1c9894662795
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91 | // STEP 2: busy waiting until measurement results are available |
1c9894662795
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92 | bool busy; |
1c9894662795
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93 | do |
1c9894662795
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94 | { |
1c9894662795
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95 | ESP_ERROR_CHECK(bme680_is_measuring(sensor, &busy)); |
1c9894662795
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96 | } |
1c9894662795
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97 | while(busy); |
1c9894662795
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98 | |
1c9894662795
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99 | // STEP 3: get the results and do something with them |
1c9894662795
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100 | if (bme680_get_results_float(sensor, &values) == ESP_OK) |
1c9894662795
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101 | ... |
1c9894662795
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102 | } |
1c9894662795
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103 | ... |
1c9894662795
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104 | ``` |
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105 | |
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106 | For convenience, it is also possible to use the high-level functions |
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107 | `bme680_measure_float()` or `bme680_measure_fixed()`. These functions combine |
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108 | all 3 steps above within a single function and are therefore very easy to use. |
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109 | **Please note** that these functions must not be used when they are called |
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110 | from a software timer callback function since the calling task is delayed |
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111 | using function *vTaskDelay*. |
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112 | |
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113 | ```C |
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114 | ... |
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115 | // ONE STEP: measure, wait, get the results and do something with them |
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116 | if (bme680_measure_float(sensor, &values) == ESP_OK) |
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117 | ... |
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118 | ... |
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119 | ``` |
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120 | |
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121 | #### Measurement results |
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122 | |
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123 | Once the sensor has finished the measurement raw data are available at the sensor. |
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124 | Either function `bme680_get_results_fixed()` or function |
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125 | `bme680_get_results_float()` can be used to fetch the results. Both functions |
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126 | read raw data from the sensor and converts them into utilizable fixed point or |
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127 | floating point sensor values. |
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128 | |
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129 | **Please note:** Conversion of raw sensor data into the final sensor values is |
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130 | based on very complex calculations that use a large number of calibration |
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131 | parameters. Therefore, the driver does not provide functions that only return |
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132 | the raw sensor data. |
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133 | |
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134 | Dependent on sensor value representation, measurement results contain different |
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135 | dimensions: |
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136 | |
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137 | | Value | Fixed Point | Floating Point | Conversion |
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138 | | -------------- | ------------- | -------------- |--------------------- |
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139 | | temperature | 1/100 °C | °C | float = fixed / 100 |
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140 | | pressure | Pascal | hPascal | float = fixed / 100 |
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141 | | humidity | 1/1000 % | % | float = fixed / 1000 |
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142 | | gas_resistance | Ohm | Ohm | float = fixed |
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143 | |
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144 | The gas resistance value in Ohm represents the resistance of sensor's gas sensitive |
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145 | layer. |
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146 | |
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147 | If the TPHG measurement cycle or fetching the results fails, invalid sensor values |
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148 | are returned: |
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149 | |
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150 | | Invalid Value | Fixed Point | Floating Point |
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151 | | -------------- | ----------- | --------------- |
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152 | | temperature | INT16_MIN | -327.68 |
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153 | | pressure | 0 | 0.0 |
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154 | | humidity | 0 | 0.0 |
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155 | | gas_resistance | 0 | 0.0 |
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156 | |
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157 | ## Measurement settings |
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158 | |
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159 | The sensor allows to change a lot of measurement parameters. |
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160 | |
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161 | ### Oversampling rates |
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162 | |
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163 | To increase the resolution of raw sensor data, the sensor supports |
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164 | oversampling for temperature, pressure, and humidity measurements. Using |
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165 | function `bme680_set_oversampling_rates()`, individual **oversampling rates** |
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166 | can be defined for these measurements. With an oversampling rate *osr*, the |
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167 | resolution of the according raw sensor data can be increased from 16 bit to |
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168 | 16+ld(*osr*) bit. |
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169 | |
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170 | Possible oversampling rates are 1x (default by the driver) 2x, 4x, 8x and 16x. |
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171 | It is also possible to define an oversampling rate of 0. This **deactivates** |
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172 | the corresponding measurement and the output values become invalid. |
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173 | |
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174 | ```C |
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175 | ... |
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176 | // Changes the oversampling rate for temperature to 4x and for pressure to 2x. Humidity measurement is skipped. |
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177 | ESP_ERROR_CHECK(bme680_set_oversampling_rates(sensor, osr_4x, osr_2x, osr_none)); |
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178 | ... |
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179 | ``` |
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180 | |
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181 | ### IIR Filter |
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182 | |
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183 | The sensor also integrates an internal IIR filter (low pass filter) to reduce |
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184 | short-term changes in sensor output values caused by external disturbances. |
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185 | It effectively reduces the bandwidth of the sensor output values. |
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186 | |
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187 | The filter can optionally be used for pressure and temperature data that are |
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188 | subject to many short-term changes. With the IIR filter the resolution of |
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189 | pressure and temperature data increases to 20 bit. Humidity and gas inside |
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190 | the sensor does not fluctuate rapidly and does not require such a low pass |
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191 | filtering. |
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192 | |
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193 | Using function `bme680_set_filter_size()`, the user task can change the |
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194 | **size of the filter**. The default size is 3. If the size of the filter |
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195 | becomes 0, the filter is **not used**. |
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196 | |
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197 | ```C |
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198 | ... |
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199 | // Change the IIR filter size for temperature and pressure to 7. |
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200 | bme680_set_filter_size(sensor, iir_size_7); |
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201 | ... |
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202 | // Don't use IIR filter |
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203 | bme680_set_filter_size(sensor, iir_size_0); |
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204 | ... |
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205 | ``` |
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206 | |
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207 | ### Heater profile |
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208 | |
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209 | For the gas measurement, the sensor integrates a heater. Parameters for this |
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210 | heater are defined by **heater profiles**. The sensor supports up to 10 such |
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211 | heater profiles, which are numbered from 0 to 9. Each profile consists of a |
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212 | temperature set-point (the target temperature) and a heating duration. By |
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213 | default, only the heater profile 0 with 320 degree Celsius as target temperature |
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214 | and 150 ms heating duration is defined. |
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215 | |
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216 | **Please note:** According to the data sheet, target temperatures between 200 |
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217 | and 400 degrees Celsius are typical and about 20 to 30 ms are necessary for |
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218 | the heater to reach the desired target temperature. |
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219 | |
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220 | Function `bme680_set_heater_profile()` can be used to set the parameters |
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221 | for one of the heater profiles 0 ... 9. Once the parameters of a heater profile |
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222 | are defined, the gas measurement can be activated with that heater profile |
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223 | using function `bme680_use_heater_profile()`. If -1 or `BME680_HEATER_NOT_USED` |
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224 | is used as heater profile, gas measurement is deactivated completely. |
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225 | |
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226 | ```C |
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227 | ... |
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228 | // Change the heater profile 1 to 300 degree Celsius for 100 ms and activate it |
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229 | bme680_set_heater_profile (sensor, 1, 300, 100); |
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230 | bme680_use_heater_profile (sensor, 1); |
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231 | ... |
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232 | // Deactivate gas measurement completely |
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233 | bme680_use_heater_profile (sensor, BME680_HEATER_NOT_USED); |
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234 | ... |
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235 | |
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236 | ``` |
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237 | |
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238 | If several heater profiles have been defined with function |
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239 | `bme680_set_heater_profile()`, a sequence of gas measurements with different |
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240 | heater parameters can be realized by a sequence of activations of different |
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241 | heater profiles for successive TPHG measurements using function |
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242 | `bme680_use_heater_profile()`. |
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243 | |
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244 | For example, if there were 5 heater profiles defined with following code |
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245 | during the setup |
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246 | |
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247 | ```C |
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248 | bme680_set_heater_profile(sensor, 0, 200, 100); |
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249 | bme680_set_heater_profile(sensor, 1, 250, 120); |
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250 | bme680_set_heater_profile(sensor, 2, 300, 140); |
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251 | bme680_set_heater_profile(sensor, 3, 350, 160); |
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252 | bme680_set_heater_profile(sensor, 4, 400, 180); |
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253 | ``` |
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254 | |
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255 | the user task could use them as a sequence like following: |
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256 | |
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257 | ```C |
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258 | ... |
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259 | while (1) |
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260 | { |
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261 | switch (count++ % 5) |
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262 | { |
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263 | case 0: bme680_use_heater_profile(sensor, 0); break; |
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264 | case 1: bme680_use_heater_profile(sensor, 1); break; |
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265 | case 2: bme680_use_heater_profile(sensor, 2); break; |
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266 | case 3: bme680_use_heater_profile(sensor, 3); break; |
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267 | case 4: bme680_use_heater_profile(sensor, 4); break; |
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268 | } |
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269 | |
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270 | // measurement duration changes in each cycle |
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271 | uint32_t duration; |
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272 | bme680_get_measurement_duration(sensor, &duration); |
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273 | |
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274 | // trigger the sensor to start one TPHG measurement cycle |
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275 | if (bme680_force_measurement(sensor) == ESP_OK) |
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276 | { |
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277 | vTaskDelay(duration); |
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278 | |
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279 | // get the results and do something with them |
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280 | if (bme680_get_results_float(sensor, &values) == ESP_OK) |
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281 | ... |
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282 | } |
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283 | ... |
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284 | } |
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285 | ... |
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286 | ``` |
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287 | |
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288 | ### Ambient temperature |
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289 | |
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290 | The heater resistance calculation algorithm takes into account the ambient |
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291 | temperature of the sensor. Using function `bme680_set_ambient_temperature()`, |
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292 | the ambient temperature either determined from the sensor itself or from |
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293 | another temperature sensor can be set. |
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294 | |
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295 | ```C |
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296 | ... |
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297 | bme680_set_ambient_temperature(sensor, ambient); |
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298 | ... |
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299 | ``` |
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300 | |
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301 | ## Usage |
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302 | |
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303 | First, the hardware configuration has to be established. This can differ |
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304 | dependent on the communication interface and the number of sensors used. |
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305 | |
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306 | ### Hardware configurations |
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307 | |
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308 | The driver supports multiple BME680 sensors at the same time that are |
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309 | connected to I2C. Following figure show some possible hardware |
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310 | configurations. |
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311 | |
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312 | First figure shows the configuration with only one sensor at I2C bus 0. |
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313 | |
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314 | ```text |
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315 | +------------------+ +----------+ |
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316 | | ESP8266 / ESP32 | | BME680 | |
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317 | | | | | |
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318 | | GPIO 14 (SCL) ----> SCL | |
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319 | | GPIO 13 (SDA) <---> SDA | |
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320 | +------------------+ +----------+ |
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321 | ``` |
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322 | |
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323 | Next figure shows a possible configuration with two I2C buses. In that case, |
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324 | the sensors can have same or different I2C slave addresses. |
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325 | |
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326 | ```text |
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327 | +------------------+ +----------+ |
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328 | | ESP8266 / ESP32 | | BME680_1 | |
1c9894662795
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329 | | | | | |
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330 | | GPIO 14 (SCL) ----> SCL | |
1c9894662795
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331 | | GPIO 13 (SDA) <---> SDA | |
1c9894662795
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332 | | | +----------+ |
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333 | | | | BME680_2 | |
1c9894662795
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334 | | | | | |
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335 | | GPIO 5 (SCL) ----> SCL | |
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336 | | GPIO 4 (SDA) <---> SDA | |
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337 | +------------------+ +----------+ |
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338 | ``` |
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339 | |
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340 | Further configurations are possible, e.g., two sensors that are connected |
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341 | at the same I2C bus with different slave addresses. |
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342 |