Sun, 16 Apr 2023 12:27:12 +0200
Preparations for BLE GATT. Added extra time after INA219 is powered on before measurement. Reduced LEDC frequency to 60 Hz, that makes the LED lights less nervous. Hardware mod on output 4, now needs external pulldown resistor.
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1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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parents:
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1 | /** |
1c9894662795
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2 | * @file sgp40.h |
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3 | * @defgroup sgp40 sgp40 |
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4 | * @{ |
1c9894662795
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5 | * |
1c9894662795
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6 | * ESP-IDF driver for SGP40 Indoor Air Quality Sensor for VOC Measurements |
1c9894662795
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7 | * |
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8 | * Copyright (c) 2020 Ruslan V. Uss <unclerus@gmail.com> |
1c9894662795
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9 | * |
1c9894662795
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10 | * BSD Licensed as described in the file LICENSE |
1c9894662795
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11 | */ |
1c9894662795
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12 | #ifndef __SGP40_H__ |
1c9894662795
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13 | #define __SGP40_H__ |
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14 | |
1c9894662795
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15 | #include <stdbool.h> |
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16 | #include <time.h> |
1c9894662795
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17 | #include <i2cdev.h> |
1c9894662795
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18 | #include <esp_err.h> |
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19 | #include "sensirion_voc_algorithm.h" |
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20 | |
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21 | #ifdef __cplusplus |
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22 | extern "C" { |
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23 | #endif |
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24 | |
1c9894662795
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25 | #define SGP40_ADDR 0x59 //!< I2C address |
1c9894662795
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26 | |
1c9894662795
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27 | /** |
1c9894662795
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28 | * Device descriptor |
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29 | */ |
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30 | typedef struct |
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31 | { |
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32 | i2c_dev_t i2c_dev; |
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33 | uint16_t serial[3]; |
1c9894662795
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34 | uint16_t featureset; |
1c9894662795
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35 | VocAlgorithmParams voc; |
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36 | } sgp40_t; |
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37 | |
1c9894662795
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38 | /** |
1c9894662795
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39 | * @brief Initialize device descriptor |
1c9894662795
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40 | * |
1c9894662795
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41 | * @param dev Device descriptor |
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42 | * @param port I2C port |
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43 | * @param sda_gpio SDA GPIO |
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44 | * @param scl_gpio SCL GPIO |
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45 | * @return `ESP_OK` on success |
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46 | */ |
1c9894662795
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47 | esp_err_t sgp40_init_desc(sgp40_t *dev, i2c_port_t port, gpio_num_t sda_gpio, gpio_num_t scl_gpio); |
1c9894662795
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48 | |
1c9894662795
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49 | /** |
1c9894662795
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50 | * @brief Free device descriptor |
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51 | * |
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52 | * @param dev Device descriptor |
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53 | * @return `ESP_OK` on success |
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54 | */ |
1c9894662795
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55 | esp_err_t sgp40_free_desc(sgp40_t *dev); |
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56 | |
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57 | /** |
1c9894662795
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58 | * @brief Read device information, initialize the VOC algorithm |
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59 | * |
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60 | * @param dev Device descriptor |
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61 | * @return `ESP_OK` on success |
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62 | */ |
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63 | esp_err_t sgp40_init(sgp40_t *dev); |
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64 | |
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65 | /** |
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66 | * @brief Reset device, than put it to idle mode |
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67 | * |
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68 | * @param dev Device descriptor |
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69 | * @return `ESP_OK` on success |
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70 | */ |
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71 | esp_err_t sgp40_soft_reset(sgp40_t *dev); |
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72 | |
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73 | /** |
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74 | * @brief Perform a self-test |
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75 | * |
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76 | * @param dev Device descriptor |
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77 | * @return `ESP_OK` on success |
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78 | */ |
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79 | esp_err_t sgp40_self_test(sgp40_t *dev); |
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80 | |
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81 | /** |
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82 | * @brief Turn hotplate off, stop measurement and put device to idle mode |
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83 | * |
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84 | * @param dev Device descriptor |
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85 | * @return `ESP_OK` on success |
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86 | */ |
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87 | esp_err_t sgp40_heater_off(sgp40_t *dev); |
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88 | |
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89 | /** |
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90 | * @brief Perform a measurement |
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91 | * |
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92 | * @param dev Device descriptor |
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93 | * @param humidity Relative humidity, percents. Use NaN if |
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94 | * you want uncompensated measurement |
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95 | * @param temperature Temperature, degrees Celsius. Use NaN if |
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96 | * you want uncompensated measurement |
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97 | * @param[out] raw Raw value, proportional to the logarithm |
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98 | * of the resistance of the sensing element |
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99 | * @return `ESP_OK` on success |
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100 | */ |
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101 | esp_err_t sgp40_measure_raw(sgp40_t *dev, float humidity, float temperature, uint16_t *raw); |
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102 | |
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103 | /** |
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104 | * @brief Perform a measurement and update VOC index |
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105 | * |
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106 | * @param dev Device descriptor |
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107 | * @param humidity Relative humidity, percents. Use NaN if |
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108 | * you want uncompensated measurement |
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109 | * @param temperature Temperature, degrees Celsius. Use NaN if |
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110 | * you want uncompensated measurement |
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111 | * @param[out] voc_index Calculated VOC index |
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112 | * @return |
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113 | */ |
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114 | esp_err_t sgp40_measure_voc(sgp40_t *dev, float humidity, float temperature, int32_t *voc_index); |
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115 | |
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116 | #ifdef __cplusplus |
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117 | } |
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118 | #endif |
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119 | |
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120 | /**@}*/ |
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121 | |
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122 | #endif /* __SGP40_H__ */ |