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.
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1 | /* |
1c9894662795
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2 | * Copyright (c) 2020 Erriez <https://github.com/Erriez> |
1c9894662795
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3 | * Copyright (c) 2021 David Douard <david.douard@sdfa3.org> |
1c9894662795
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4 | * |
1c9894662795
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5 | * Redistribution and use in source and binary forms, with or without |
1c9894662795
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6 | * modification, are permitted provided that the following conditions are met: |
1c9894662795
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7 | * |
1c9894662795
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8 | * 1. Redistributions of source code must retain the above copyright notice, |
1c9894662795
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9 | * this list of conditions and the following disclaimer. |
1c9894662795
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10 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
1c9894662795
Added esp-idf-lib for a lot of sensors. Added the basic design for the BMP280 task.
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11 | * this list of conditions and the following disclaimer in the documentation |
1c9894662795
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12 | * and/or other materials provided with the distribution. |
1c9894662795
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13 | * 3. Neither the name of the copyright holder nor the names of itscontributors |
1c9894662795
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14 | * may be used to endorse or promote products derived from this software without |
1c9894662795
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15 | * specific prior written permission. |
1c9894662795
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16 | * |
1c9894662795
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17 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
1c9894662795
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18 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
1c9894662795
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
1c9894662795
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20 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
1c9894662795
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
1c9894662795
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
1c9894662795
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23 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
1c9894662795
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24 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
1c9894662795
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25 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
1c9894662795
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26 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
1c9894662795
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27 | */ |
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28 | |
1c9894662795
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29 | /** |
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30 | * @file mhz19b.h |
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31 | * @defgroup mhz19b mhz19b |
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32 | * @{ |
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33 | * |
1c9894662795
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34 | * ESP-IDF driver for MH-Z19B NDIR CO2 sensor connected to UART |
1c9894662795
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35 | * |
1c9894662795
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36 | * Inspired from https://github.com/Erriez/ErriezMHZ19B |
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37 | * |
1c9894662795
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38 | * Copyright (c) 2020 Erriez <https://github.com/Erriez>\n |
1c9894662795
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39 | * Copyright (c) 2021 David Douard <david.douard@sdfa3.org> |
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40 | * |
1c9894662795
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41 | * BSD Licensed as described in the file LICENSE |
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42 | */ |
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43 | #ifndef __MHZ19B_H__ |
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44 | #define __MHZ19B_H__ |
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45 | |
1c9894662795
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46 | #include <stdbool.h> |
1c9894662795
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47 | #include <driver/uart.h> |
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48 | #include <driver/gpio.h> |
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49 | #include <esp_err.h> |
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50 | |
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51 | #ifdef __cplusplus |
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52 | extern "C" { |
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53 | #endif |
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54 | |
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55 | /** |
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56 | * @brief MHZ19B sensor device data structure |
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57 | */ |
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58 | typedef struct |
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59 | { |
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60 | uart_port_t uart_port; ///< UART port used to communicate |
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61 | uint8_t *buf; ///< read buffer attached to this device |
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62 | int16_t last_value; ///< last read value |
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63 | int64_t last_ts; ///< timestamp of the last sensor co2 level reading |
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64 | } mhz19b_dev_t; |
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65 | |
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66 | //! 3 minutes warming-up time after power-on before valid data returned |
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67 | #define MHZ19B_WARMING_UP_TIME_MS (3UL * 60000UL) |
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68 | #define MHZ19B_WARMING_UP_TIME_US (3UL * 60000UL * 1000UL) |
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69 | |
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70 | //! Minimum response time between CO2 reads (EXPERIMENTALLY DEFINED) |
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71 | #define MHZ19B_READ_INTERVAL_MS (5UL * 1000UL) |
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72 | |
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73 | //! Fixed 9 Bytes response |
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74 | #define MHZ19B_SERIAL_RX_BYTES 9 |
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75 | //! 128 is the minimal value the UART driver will accept (at least on esp32) |
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76 | #define MHZ19B_SERIAL_BUF_LEN 128 |
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77 | |
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78 | //! Response timeout between 15..120 ms at 9600 baud works reliable for all commands |
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79 | #define MHZ19B_SERIAL_RX_TIMEOUT_MS 120 |
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80 | |
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81 | // Documented commands |
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82 | #define MHZ19B_CMD_SET_AUTO_CAL 0x79 ///< set auto calibration on/off |
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83 | #define MHZ19B_CMD_READ_CO2 0x86 ///< read CO2 concentration |
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84 | #define MHZ19B_CMD_CAL_ZERO_POINT 0x87 ///< calibrate zero point at 400ppm |
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85 | #define MHZ19B_CMD_CAL_SPAN_PIONT 0x88 ///< calibrate span point (NOT IMPLEMENTED) |
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86 | #define MHZ19B_CMD_SET_RANGE 0x99 ///< set detection range |
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87 | |
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88 | // Not documented commands |
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89 | #define MHZ19B_CMD_GET_AUTO_CAL 0x7D ///< get auto calibration status (NOT DOCUMENTED) |
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90 | #define MHZ19B_CMD_GET_RANGE 0x9B ///< get range detection (NOT DOCUMENTED) |
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91 | #define MHZ19B_CMD_GET_VERSION 0xA0 ///< get firmware version (NOT DOCUMENTED) |
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92 | |
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93 | /** |
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94 | * @brief PPM range |
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95 | */ |
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96 | typedef enum { |
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97 | MHZ19B_RANGE_2000 = 2000, ///< 2000 ppm |
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98 | MHZ19B_RANGE_5000 = 5000, ///< 5000 ppm (Default) |
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99 | } mhz19b_range_t; |
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100 | |
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101 | |
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102 | /** |
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103 | * @brief Initialize device descriptor |
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104 | * |
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105 | * @param dev Pointer to the sensor device data structure |
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106 | * @param uart_port UART poert number |
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107 | * @param tx_gpio GPIO pin number for TX |
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108 | * @param rx_gpio GPIO pin number for RX |
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109 | * |
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110 | * @return ESP_OK on success |
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111 | */ |
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112 | esp_err_t mhz19b_init(mhz19b_dev_t *dev, uart_port_t uart_port, gpio_num_t tx_gpio, gpio_num_t rx_gpio); |
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113 | |
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114 | /** |
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115 | * @brief Free device descriptor |
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116 | * |
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117 | * @param dev Pointer to the sensor device data structure |
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118 | * |
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119 | * @return ESP_OK on success |
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120 | */ |
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121 | esp_err_t mhz19b_free(mhz19b_dev_t *dev); |
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122 | |
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123 | /** |
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124 | * @brief Detect sensor by checking range response |
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125 | * |
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126 | * @param dev Pointer to the sensor device data structure |
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127 | * |
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128 | * @return true if sensor is detected |
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129 | */ |
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130 | bool mhz19b_detect(mhz19b_dev_t *dev); |
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131 | |
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132 | /** |
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133 | * @brief Check if sensor is warming up |
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134 | * |
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135 | * @param dev Pointer to the sensor device data structure |
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136 | * @param smart_warming_up Smart check |
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137 | * |
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138 | * @return true if sensor is warming up |
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139 | */ |
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140 | bool mhz19b_is_warming_up(mhz19b_dev_t *dev, bool smart_warming_up); |
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141 | |
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142 | /** |
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143 | * @brief Check minimum interval between CO2 reads |
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144 | * |
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145 | * Not described in the datasheet, but it is the same frequency as the built-in LED blink. |
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146 | * |
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147 | * @param dev Pointer to the sensor device data structure |
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148 | * |
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149 | * @return true if ready to call ::mhz19b_read_co2() |
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150 | */ |
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151 | bool mhz19b_is_ready(mhz19b_dev_t *dev); |
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152 | |
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153 | /** |
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154 | * @brief Read CO2 from sensor |
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155 | * |
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156 | * @param dev Pointer to the sensor device data structure |
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157 | * @param[out] co2 CO2 level |
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158 | * - < 0: MH-Z19B response error codes. |
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159 | * - 0..399 ppm: Incorrect values. Minimum value starts at 400ppm outdoor fresh air. |
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160 | * - 400..1000 ppm: Concentrations typical of occupied indoor spaces with good air exchange. |
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161 | * - 1000..2000 ppm: Complaints of drowsiness and poor air quality. Ventilation is required. |
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162 | * - 2000..5000 ppm: Headaches, sleepiness and stagnant, stale, stuffy air. Poor concentration, loss of |
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163 | * attention, increased heart rate and slight nausea may also be present. |
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164 | * - Higher values are extremely dangerous and cannot be measured. |
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165 | * |
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166 | * @return ESP_OK on success |
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167 | */ |
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168 | esp_err_t mhz19b_read_co2(mhz19b_dev_t *dev, int16_t *co2); |
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169 | |
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170 | /** |
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171 | * @brief Get firmware version (NOT DOCUMENTED) |
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172 | * |
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173 | * @details |
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174 | * This is an undocumented command, but most sensors returns ASCII "0430 or "0443". |
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175 | * |
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176 | * @param dev Pointer to the sensor device data structure |
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177 | * @param[out] version |
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178 | * Returned character pointer to version (must be at least 5 Bytes)\n |
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179 | * Only valid when return is set to ESP_OK. |
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180 | * |
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181 | * @return ESP_OK on success |
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182 | */ |
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183 | esp_err_t mhz19b_get_version(mhz19b_dev_t *dev, char *version); |
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184 | |
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185 | /** |
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186 | * @brief Set CO2 range |
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187 | * |
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188 | * @param dev Pointer to the sensor device data structure |
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189 | * @param range Range of the sensor (2000 or 5000, in ppm) |
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190 | * |
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191 | * @return ESP_OK on success |
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192 | */ |
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193 | esp_err_t mhz19b_set_range(mhz19b_dev_t *dev, mhz19b_range_t range); |
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194 | |
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195 | /** |
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196 | * @brief Get CO2 range in PPM (NOT DOCUMENTED) |
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197 | * |
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198 | * @details |
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199 | * This function verifies valid read ranges of 2000 or 5000 ppm.\n |
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200 | * Note: Other ranges may be returned, but are undocumented and marked as invalid. |
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201 | * |
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202 | * @param dev Pointer to the sensor device data structure |
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203 | * @param range Current value of the range of the sensor (output) |
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204 | * |
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205 | * @return ESP_OK on success |
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206 | */ |
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207 | esp_err_t mhz19b_get_range(mhz19b_dev_t *dev, uint16_t *range); |
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208 | |
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209 | /** |
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210 | * @brief Enable or disable automatic calibration |
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211 | * |
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212 | * @param dev Pointer to the sensor device data structure |
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213 | * @param calibration_on |
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214 | * - true: Automatic calibration on. |
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215 | * - false: Automatic calibration off. |
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216 | * |
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217 | * @return ESP_OK on success |
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218 | */ |
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219 | esp_err_t mhz19b_set_auto_calibration(mhz19b_dev_t *dev, bool calibration_on); |
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220 | |
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221 | /** |
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222 | * @brief Get status of automatic calibration (NOT DOCUMENTED) |
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223 | * |
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224 | * @param dev Pointer to the sensor device data structure |
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225 | * @param[out] calibration_on Automatic calibration status |
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226 | * |
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227 | * @return ESP_OK on success |
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228 | */ |
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229 | esp_err_t mhz19b_get_auto_calibration( |
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230 | mhz19b_dev_t *dev, bool *calibration_on); // (NOT DOCUMENTED) |
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231 | |
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232 | /** |
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233 | * @brief Start Zero Point Calibration manually at 400ppm |
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234 | * |
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235 | * @details |
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236 | * The sensor must be powered-up for at least 20 minutes in fresh air at 400ppm room |
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237 | * temperature. Then call this function once to execute self calibration.\n |
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238 | * Recommended to use this function when auto calibration is off. |
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239 | * |
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240 | * @param dev Pointer to the sensor device data structure |
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241 | * |
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242 | * @return ESP_OK on success |
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243 | */ |
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244 | esp_err_t mhz19b_start_calibration(mhz19b_dev_t *dev); |
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245 | |
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246 | /** |
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247 | * @brief Send serial command to sensor and read response |
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248 | * |
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249 | * @details |
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250 | * Send command to sensor and read response, protected with a receive timeout.\n |
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251 | * Result is available in the device descriptor buffer. |
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252 | * |
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253 | * @param dev Pointer to the sensor device data structure |
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254 | * @param cmd Command Byte |
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255 | * @param b3 Byte 3 (default 0) |
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256 | * @param b4 Byte 4 (default 0) |
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257 | * @param b5 Byte 5 (default 0) |
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258 | * @param b6 Byte 6 (default 0) |
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259 | * @param b7 Byte 7 (default 0) |
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260 | */ |
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261 | esp_err_t mhz19b_send_command(mhz19b_dev_t *dev, uint8_t cmd, |
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262 | uint8_t b3, uint8_t b4, uint8_t b5, |
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263 | uint8_t b6, uint8_t b7); |
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264 | |
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265 | /** |
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266 | * @brief Calculate CRC on 8 data Bytes buffer |
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267 | * |
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268 | * @param data Buffer pointer to calculate CRC. |
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269 | * @return Calculated 8-bit CRC. |
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270 | */ |
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271 | uint8_t mhz19b_calc_crc(uint8_t *data); |
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272 | |
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273 | #ifdef __cplusplus |
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274 | } |
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275 | #endif /* End of CPP guard */ |
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276 | |
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277 | /**@}*/ |
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278 | |
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279 | #endif /* __MHZ19B_H__ */ |