Version 1.1.0
Added some sensor types. Added datasheets.
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@ -1,4 +1,4 @@
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# ESP32 ESP-IDF and ESP8266 RTOS SDK component for AHT20/AHT21 humidity & temperature sensor
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# ESP32 ESP-IDF and ESP8266 RTOS SDK component for AHT10/AHT15/AHT20/AHT21/AHT25/AHT30 humidity & temperature sensor
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## Tested on
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BIN
ds/AHT10.pdf
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ds/AHT10.pdf
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ds/AHT15.pdf
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ds/AHT15.pdf
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ds/AHT20.pdf
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ds/AHT20.pdf
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ds/AHT21.pdf
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ds/AHT21.pdf
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ds/AHT25.pdf
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ds/AHT25.pdf
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ds/AHT30.pdf
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ds/AHT30.pdf
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@ -10,9 +10,11 @@
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#define ZH_AHT_INIT_CONFIG_DEFAULT() \
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{ \
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.i2c_port = 0 \
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#define ZH_AHT_INIT_CONFIG_DEFAULT() \
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{ \
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.sensor_type = ZH_AHT2X, \
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.i2c_address = ZH_I2C_ADDRESS_LOW, \
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.i2c_port = 0 \
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}
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#ifdef __cplusplus
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@ -22,11 +24,20 @@ extern "C"
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typedef struct // Structure for initial initialization of AHT sensor.
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{
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enum // Sensor type.
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{
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ZH_AHT1X, // AHT10/AHT15.
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ZH_AHT2X // AHT20/AHT21/AHT25/AHT30.
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} sensor_type;
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enum // Sensor I2C address.
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{
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ZH_I2C_ADDRESS_HIGH = 0x39, // Address pin connected to VCC. AHT10 only.
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ZH_I2C_ADDRESS_LOW = 0x38 // AHT15/AHT20/AHT21/AHT25/AHT30. AHT10 address pin connected to GND.
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} i2c_address;
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bool i2c_port; // I2C port.
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#ifndef CONFIG_IDF_TARGET_ESP8266
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i2c_master_bus_handle_t i2c_handle; // Unique I2C bus handle.
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#endif
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} zh_aht_init_config_t;
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/**
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@ -1 +1 @@
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1.0.1
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1.1.0
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zh_aht.c
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zh_aht.c
@ -1,12 +1,13 @@
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#include "zh_aht.h"
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#define I2C_DATA_SIZE 7 // Sensor data size.
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#define MEASUREMENT_TIME 80 // Sensor measurement time.
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#define RESET_TIME 20 // Sensor reset time.
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#define I2C_ADDRESS 0x38 // Sensor I2C address.
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#define I2C_MAX_DATA_SIZE 7 // Sensor maximum data size (in bytes).
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#define MEASUREMENT_TIME 80 // Sensor measurement time (in milliseconds).
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#define RESET_TIME 20 // Sensor reset time (in milliseconds).
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#define I2C_DATA_READ_COMMAND 0xAC, 0x33, 0x00 // Command for read sensor data (temperature and humidity).
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#define I2C_RESET_COMMAND 0xBA // Command for reset sensor.
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#define I2C_INIT_COMMAND 0xBE, 0x08, 0x00 // Command for initialize sensor.
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#define I2C_INIT_COMMAND 0x00, 0x08, 0x00 // Command for initialize sensor. First byte is depend of sensor type.
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#define I2C_INIT_AHT1X_FIRST_BYTE 0xE1 // First byte for command for initialize sensor. For AHT1X series.
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#define I2C_INIT_AHT2X_FIRST_BYTE 0xBE // First byte for command for initialize sensor. For AHT2X/3X series.
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#define I2C_STATUS_READ_COMMAND 0x71 // Command for read sensor status.
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static zh_aht_init_config_t _init_config = {0};
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@ -31,11 +32,11 @@ esp_err_t zh_aht_init(const zh_aht_init_config_t *config)
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#ifndef CONFIG_IDF_TARGET_ESP8266
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i2c_device_config_t aht_config = {
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.dev_addr_length = I2C_ADDR_BIT_LEN_7,
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.device_address = I2C_ADDRESS,
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.device_address = _init_config.i2c_address,
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.scl_speed_hz = 100000,
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};
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i2c_master_bus_add_device(_init_config.i2c_handle, &aht_config, &_aht_handle);
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if (i2c_master_probe(_init_config.i2c_handle, I2C_ADDRESS, 1000 / portTICK_PERIOD_MS) != ESP_OK)
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if (i2c_master_probe(_init_config.i2c_handle, _init_config.i2c_address, 1000 / portTICK_PERIOD_MS) != ESP_OK)
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{
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ESP_LOGE(TAG, "AHT initialization fail. Sensor not connected or not responded.");
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return ESP_ERR_NOT_FOUND;
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@ -47,7 +48,7 @@ esp_err_t zh_aht_init(const zh_aht_init_config_t *config)
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#ifdef CONFIG_IDF_TARGET_ESP8266
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i2c_cmd_handle_t i2c_cmd_handle = i2c_cmd_link_create();
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i2c_master_start(i2c_cmd_handle);
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i2c_master_write_byte(i2c_cmd_handle, I2C_ADDRESS << 1 | I2C_MASTER_WRITE, true);
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i2c_master_write_byte(i2c_cmd_handle, _init_config.i2c_address << 1 | I2C_MASTER_WRITE, true);
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i2c_master_write_byte(i2c_cmd_handle, command, true);
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i2c_master_stop(i2c_cmd_handle);
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esp_err = i2c_master_cmd_begin(_init_config.i2c_port, i2c_cmd_handle, 1000 / portTICK_PERIOD_MS);
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@ -63,7 +64,7 @@ esp_err_t zh_aht_init(const zh_aht_init_config_t *config)
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#ifdef CONFIG_IDF_TARGET_ESP8266
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i2c_cmd_handle = i2c_cmd_link_create();
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i2c_master_start(i2c_cmd_handle);
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i2c_master_write_byte(i2c_cmd_handle, I2C_ADDRESS << 1 | I2C_MASTER_READ, true);
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i2c_master_write_byte(i2c_cmd_handle, _init_config.i2c_address << 1 | I2C_MASTER_READ, true);
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i2c_master_read_byte(i2c_cmd_handle, &sensor_data, I2C_MASTER_NACK);
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i2c_master_stop(i2c_cmd_handle);
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esp_err = i2c_master_cmd_begin(_init_config.i2c_port, i2c_cmd_handle, 1000 / portTICK_PERIOD_MS);
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@ -76,13 +77,21 @@ esp_err_t zh_aht_init(const zh_aht_init_config_t *config)
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ESP_LOGE(TAG, "AHT initialization fail. I2C driver error at line %d.", __LINE__);
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return ESP_ERR_INVALID_RESPONSE;
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}
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if ((sensor_data & 0b00001000) == 0)
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if ((sensor_data & 0x08) == 0) // If sensor is not calibrated.
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{
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uint8_t command[] = {I2C_INIT_COMMAND};
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if (_init_config.sensor_type == ZH_AHT1X)
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{
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command[0] = I2C_INIT_AHT1X_FIRST_BYTE;
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}
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else
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{
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command[0] = I2C_INIT_AHT2X_FIRST_BYTE;
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}
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#ifdef CONFIG_IDF_TARGET_ESP8266
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i2c_cmd_handle_t i2c_cmd_handle = i2c_cmd_link_create();
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i2c_master_start(i2c_cmd_handle);
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i2c_master_write_byte(i2c_cmd_handle, I2C_ADDRESS << 1 | I2C_MASTER_WRITE, true);
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i2c_master_write_byte(i2c_cmd_handle, _init_config.i2c_address << 1 | I2C_MASTER_WRITE, true);
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i2c_master_write_byte(i2c_cmd_handle, command[0], true);
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i2c_master_write_byte(i2c_cmd_handle, command[1], true);
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i2c_master_write_byte(i2c_cmd_handle, command[2], true);
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@ -117,12 +126,12 @@ esp_err_t zh_aht_read(float *humidity, float *temperature)
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return ESP_ERR_NOT_FOUND;
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}
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esp_err_t esp_err = ESP_OK;
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uint8_t sensor_data[I2C_DATA_SIZE] = {0};
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uint8_t sensor_data[I2C_MAX_DATA_SIZE] = {0};
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uint8_t command[] = {I2C_DATA_READ_COMMAND};
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#ifdef CONFIG_IDF_TARGET_ESP8266
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i2c_cmd_handle_t i2c_cmd_handle = i2c_cmd_link_create();
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i2c_master_start(i2c_cmd_handle);
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i2c_master_write_byte(i2c_cmd_handle, I2C_ADDRESS << 1 | I2C_MASTER_WRITE, true);
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i2c_master_write_byte(i2c_cmd_handle, _init_config.i2c_address << 1 | I2C_MASTER_WRITE, true);
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i2c_master_write_byte(i2c_cmd_handle, command[0], true);
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i2c_master_write_byte(i2c_cmd_handle, command[1], true);
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i2c_master_write_byte(i2c_cmd_handle, command[2], true);
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@ -141,7 +150,7 @@ esp_err_t zh_aht_read(float *humidity, float *temperature)
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#ifdef CONFIG_IDF_TARGET_ESP8266
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i2c_cmd_handle = i2c_cmd_link_create();
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i2c_master_start(i2c_cmd_handle);
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i2c_master_write_byte(i2c_cmd_handle, I2C_ADDRESS << 1 | I2C_MASTER_READ, true);
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i2c_master_write_byte(i2c_cmd_handle, _init_config.i2c_address << 1 | I2C_MASTER_READ, true);
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for (uint8_t i = 0; i < sizeof(sensor_data); ++i)
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{
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i2c_master_read_byte(i2c_cmd_handle, &sensor_data[i], i == (sizeof(sensor_data) - 1) ? I2C_MASTER_NACK : I2C_MASTER_ACK);
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@ -157,15 +166,18 @@ esp_err_t zh_aht_read(float *humidity, float *temperature)
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ESP_LOGE(TAG, "AHT read fail. I2C driver error at line %d.", __LINE__);
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return ESP_ERR_INVALID_RESPONSE;
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}
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if ((sensor_data[0] & 0b01000000) != 0)
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if ((sensor_data[0] & 0x40) != 0) // If sensor is busy in measurement.
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{
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ESP_LOGE(TAG, "AHT read fail. Timeout exceeded.");
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return ESP_ERR_TIMEOUT;
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}
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if (_calc_crc(sensor_data, I2C_DATA_SIZE - 1) != sensor_data[6])
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if (_init_config.sensor_type != ZH_AHT1X)
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{
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ESP_LOGE(TAG, "AHT read fail. Invalid CRC.");
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return ESP_ERR_INVALID_CRC;
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if (_calc_crc(sensor_data, I2C_MAX_DATA_SIZE - 1) != sensor_data[6])
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{
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ESP_LOGE(TAG, "AHT read fail. Invalid CRC.");
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return ESP_ERR_INVALID_CRC;
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}
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}
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*humidity = (((((uint32_t)sensor_data[1]) << 16) | (((uint32_t)sensor_data[2]) << 8) | (((uint32_t)sensor_data[3]) << 0)) >> 4) / 1048576.0 * 100.0;
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*temperature = (((((uint32_t)sensor_data[3]) << 16) | (((uint32_t)sensor_data[4]) << 8) | (((uint32_t)sensor_data[5]) << 0)) & 0xFFFFF) / 1048576.0 * 200.0 - 50.0;
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@ -186,7 +198,7 @@ esp_err_t zh_aht_reset(void)
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#ifdef CONFIG_IDF_TARGET_ESP8266
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i2c_cmd_handle_t i2c_cmd_handle = i2c_cmd_link_create();
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i2c_master_start(i2c_cmd_handle);
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i2c_master_write_byte(i2c_cmd_handle, I2C_ADDRESS << 1 | I2C_MASTER_WRITE, true);
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i2c_master_write_byte(i2c_cmd_handle, _init_config.i2c_address << 1 | I2C_MASTER_WRITE, true);
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i2c_master_write_byte(i2c_cmd_handle, command, true);
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i2c_master_stop(i2c_cmd_handle);
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esp_err = i2c_master_cmd_begin(_init_config.i2c_port, i2c_cmd_handle, 1000 / portTICK_PERIOD_MS);
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