AHT20

My implementation of AHT20 driver.

Usage

1. Init sensor AHT20_Init();
2. Start measuring AHT20_StartMeasurement();
3. Make delay about 100ms
4. Parse data AHT20_ParseData(&temp,&humidity);

Note: temp and humidity variables must be float type!

Example

with stm32 HAL

float temp = 0;
float humidity = 0;
void main() {
    HAL_Init();
    /* USER CODE BEGIN Init */
    AHT20_Init();
    /* USER CODE END Init */
    /* Initialize all configured peripherals */
    MX_I2C1_Init();
    /* Infinite loop */
    while (1)
    {
        AHT20_StartMeasurement();
        HAL_Delay(150);
        AHT20_ParseData(&temp,&humidity);
        HAL_Delay(5000);
    }
}

Return type

All functions return AHT20_ResponseTypeDef.
Values:
AHT20_OK = 0 AHT20_ERROR = 1 AHT20_BUSY = 2 AHT20_BAD_CRC =3

Explanation

• AHT20_OK if everything is OK.
• AHT20_ERROR something went wrong.
• AHT20_BUSY You called AHT20_ParseData too early, and chip still measuring.
• AHT20_BAD_CRC mismatch of CRC.

CMAKE

If you are using CMAKE, you can add config to your toolchain.

#Default path. Change tou yours.
add_subdirectory(Drivers/AHT20) 
target_link_libraries(${CMAKE_PROJECT_NAME} PRIVATE
    aht20
)

Hardware

Core functionality is hardware agnostic. You can add your hardware implementation. By default shipped with STM32 HAL implementation.

You can change hardware by toggling build params.
CMAKE params:

• AHT20_DRIVER_HAL_STM32 - Default, STM32 HAL WIP

TODO

• [] DMA and INTERRUPT modes
• [] Doxygen
• [] More supported hardware
  • [] CC13xx/CC11xx
  • [] MSP430
  • [] Arduino
  • [] PI nano SDK