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mikroSDK Library

DHT22 click

Rating:

7

Author: MikroElektronika Team

Last Updated: 2019-01-10

Category: Measurement

Downloaded: 4442 times

Followed by: 4 users

License: MIT license  

This example demonstrates how to use DHT22 click.
DHT22 sensor measures temperature and relative humidity.

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mikroSDK Library Blog

DHT22 click - example

DHT22 click - example

Front and back side appearance of the DHT22 click Board.

View full image

Library Description

The library covers all the necessary functions to control DHT22 Click board. 
Library performs the communication with the device via CS pin as output and input.
Library have drivers for sending start signal to the sensor, release the bus to wait the sensor response signal function, for reading data from sensor ( humidity and temperature data ) and for calculating temperature and humidity data and for converting sensory data into percent humidity [ % RH ] and degree Celsius [ °C ].

Key functions:

  • uint32_t dht22_getSensorData() - Reading data from the sensor function.
  • uint16_t dht22_calculateTemperature( uint32_t sensorData ) - Calculate the temperature data function.
  • uint16_t dht22_calculateHumidity( uint32_t sensorData ) - Calculate the humidity data function.

Examples description

The application is composed of the three sections :

  • System Initialization - Initializes GPIO and LOG structures, set CS pin as input/output.
  • Application Initialization - Initialization driver enable's - GPIO and start write log.
  • Application Task - (code snippet) This is a example which demonstrates the use of DHT22 Click board. DHT22 Click communicates with sensor via CS pin and display humidity and temperature value by set the CS pin as output and sends start signal to the sensor, set the CS pin as input and release the bus to wait the sensor response signal, reading data from the sensor and display calculated value of the humidity and temperature data. Results are being sent to the Usart Terminal where you can track their changes.
    All data logs write on usb uart changes for every 1 sec.
void applicationTask()
{   
    mikrobus_gpioInit( _MIKROBUS1, _MIKROBUS_CS_PIN, _GPIO_OUTPUT );

    dht22_startSignal();

    mikrobus_gpioInit( _MIKROBUS1, _MIKROBUS_CS_PIN, _GPIO_INPUT );

    if ( dht22_checkSensorResponse() )
    { 
        sensorData = dht22_getSensorData(); 
        
        if ( sensorData != 0 ) 
        {
            temperature = dht22_calculateTemperature( sensorData ); 
            humidity = dht22_calculateHumidity( sensorData ); 
            dht22_displayTempHum(); 
        } 
    } 

    Delay_1sec();

}

Additional Functions :

  • dht22_displayTempHum()  - - Write log to Usart Terminal of humidity and temperature as a two-digit number.

Other mikroE Libraries used in the example:

  • UART
  • Conversions

Additional notes and information

Depending on the development board you are using, you may need USB UART clickUSB UART 2 click or RS232 click to connect to your PC, for development systems with no UART to USB interface available on the board. The terminal available in all MikroElektronika compilers, or any other terminal application of your choice, can be used to read the message.

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