TOP Contributors

  1. MIKROE (2752 codes)
  2. Alcides Ramos (372 codes)
  3. Shawon Shahryiar (307 codes)
  4. jm_palomino (118 codes)
  5. Bugz Bensce (90 codes)
  6. S P (73 codes)
  7. dany (71 codes)
  8. MikroBUS.NET Team (35 codes)
  9. NART SCHINACKOW (34 codes)
  10. Armstrong Subero (27 codes)

Most Downloaded

  1. Timer Calculator (139071 times)
  2. FAT32 Library (71594 times)
  3. Network Ethernet Library (56989 times)
  4. USB Device Library (47330 times)
  5. Network WiFi Library (43006 times)
  6. FT800 Library (42297 times)
  7. GSM click (29777 times)
  8. mikroSDK (27874 times)
  9. PID Library (26859 times)
  10. microSD click (26129 times)
Libstock prefers package manager

Package Manager

We strongly encourage users to use Package manager for sharing their code on Libstock website, because it boosts your efficiency and leaves the end user with no room for error. [more info]

< Back
mikroSDK Library

DHT22 click

Rating:

7

Author: MIKROE

Last Updated: 2019-01-10

Package Version: 1.0.0.1

mikroSDK Library: 1.0.0.0

Category: Temperature & humidity

Downloaded: 8724 times

Followed by: 4 users

License: MIT license  

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

No Abuse Reported

Do you want to subscribe in order to receive notifications regarding "DHT22 click" changes.

Do you want to unsubscribe in order to stop receiving notifications regarding "DHT22 click" changes.

Do you want to report abuse regarding "DHT22 click".

  • mikroSDK Library 2.0.0.0
  • Comments (1)
DOWNLOAD LINK RELATED COMPILER CONTAINS
mikroBasic PRO for ARM
  • lib
  • src
  • exa
  • hlp
  • hex
  • sch
  • pcb
  • doc
mikroBasic PRO for AVR
  • lib
  • src
  • exa
  • hlp
  • hex
  • sch
  • pcb
  • doc
mikroBasic PRO for dsPIC30/33 & PIC24
  • lib
  • src
  • exa
  • hlp
  • hex
  • sch
  • pcb
  • doc
mikroBasic PRO for FT90x
  • lib
  • src
  • exa
  • hlp
  • hex
  • sch
  • pcb
  • doc
mikroBasic PRO for PIC
  • lib
  • src
  • exa
  • hlp
  • hex
  • sch
  • pcb
  • doc
mikroBasic PRO for PIC32
  • lib
  • src
  • exa
  • hlp
  • hex
  • sch
  • pcb
  • doc
mikroC PRO for ARM
  • lib
  • src
  • exa
  • hlp
  • hex
  • sch
  • pcb
  • doc
mikroC PRO for AVR
  • lib
  • src
  • exa
  • hlp
  • hex
  • sch
  • pcb
  • doc
mikroC PRO for dsPIC30/33 & PIC24
  • lib
  • src
  • exa
  • hlp
  • hex
  • sch
  • pcb
  • doc
mikroC PRO for FT90x
  • lib
  • src
  • exa
  • hlp
  • hex
  • sch
  • pcb
  • doc
mikroC PRO for PIC
  • lib
  • src
  • exa
  • hlp
  • hex
  • sch
  • pcb
  • doc
mikroC PRO for PIC32
  • lib
  • src
  • exa
  • hlp
  • hex
  • sch
  • pcb
  • doc
mikroPascal PRO for ARM
  • lib
  • src
  • exa
  • hlp
  • hex
  • sch
  • pcb
  • doc
mikroPascal PRO for AVR
  • lib
  • src
  • exa
  • hlp
  • hex
  • sch
  • pcb
  • doc
mikroPascal PRO for dsPIC30/33 & PIC24
  • lib
  • src
  • exa
  • hlp
  • hex
  • sch
  • pcb
  • doc
mikroPascal PRO for FT90x
  • lib
  • src
  • exa
  • hlp
  • hex
  • sch
  • pcb
  • doc
mikroPascal PRO for PIC
  • lib
  • src
  • exa
  • hlp
  • hex
  • sch
  • pcb
  • doc
mikroPascal PRO for PIC32
  • lib
  • src
  • exa
  • hlp
  • hex
  • sch
  • pcb
  • doc

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.

ALSO FROM THIS AUTHOR

Stepper 18 Click

0

Stepper 18 Click is a compact add-on board that contains a microstepping stepper motor driver. This board features the DRV8426, a stepper motor driver for industrial and consumer applications from Texas Instruments.

[Learn More]

Tamper 2 click

5

Tamper 2 click contains a levered D2HW-A221Dswitch by Omron, which outputs signal in both positions - pressed and released. The most common use of the Tamper 2 click is door opening or closing detection, detecting the end of travel of a linear actuator, a Morse code input device, etc.

[Learn More]

Barometer 9 Click

0

Barometer 9 Click is a compact add-on board ideal for precision activity tracking and indoor navigation/localization. This board features the ENS220, a barometric pressure and temperature sensor from ScioSense

[Learn More]