Get in sync with mother nature uaing DHT22 and STM32F429ZI

Stay ahead of the weather

Published Jun 21, 2023

Click board™

DHT22 Click

Dev Board

Fusion for STM32 v8

Compiler

NECTO Studio

MCU

STM32F429ZI

Our temperature and humidity sensing solution delivers the data you need for informed decision-making, risk assessment, and proactive maintenance, enabling you to take timely actions and ensure optimal conditions in any setting

Hardware Overview

How does it work?

DHT22 Click is based on the DHT22, a digital humidity sensor with an integrated temperature sensor and a calibrated output signal from Aosong Electronics. The DHT22 utilizes an exclusive digital-signal-collecting technique and humidity sensing technology, assuring its reliability and stability. It can read humidity over the full range of 0 to 100% RH with a typical accuracy of ±2-5%, while its maximum temperature range is from -40 to 80°C with a typical accuracy of ±0.5°C. As mentioned, the DHT22 uses a capacitive humidity sensor and

a thermistor to measure the surrounding air, providing a digital signal for the host controller on one of the two possible mikroBUS™ pins, CS and Int pins of the mikroBUS™ socket marked as SD1 and SD2. An onboard SMD jumper labeled as SDA SEL can select the desirable processing line, placing it in an appropriate position marked as SDA1 or SDA2. This Click board™ only requires careful timing to grab the data. The DHT22 can only get new data once every two seconds, meaning the sensor readings can be up to two

seconds old. This Click board™ can operate with both 3.3V and 5V logic voltage levels selected via the PWR SEL jumper. This way, it is allowed for both 3.3V and 5V capable MCUs to use the communication lines properly. However, the Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used, as a reference, for further development.

Features overview

Development board

Fusion for STM32 v8 is a development board specially designed for the needs of rapid development of embedded applications. It supports a wide range of microcontrollers, such as different 32-bit ARM® Cortex®-M based MCUs from STMicroelectronics, regardless of their number of pins, and a broad set of unique functions, such as the first-ever embedded debugger/programmer over WiFi. The development board is well organized and designed so that the end-user has all the necessary elements, such as switches, buttons, indicators, connectors, and others, in one place. Thanks to innovative manufacturing technology, Fusion for STM32 v8 provides a fluid and immersive working experience, allowing

access anywhere and under any circumstances at any time. Each part of the Fusion for STM32 v8 development board contains the components necessary for the most efficient operation of the same board. An advanced integrated CODEGRIP programmer/debugger module offers many valuable programming/debugging options, including support for JTAG, SWD, and SWO Trace (Single Wire Output)), and seamless integration with the Mikroe software environment. Besides, it also includes a clean and regulated power supply module for the development board. It can use a wide range of external power sources, including a battery, an external 12V power supply, and a power source via the USB Type-C (USB-C) connector.

Communication options such as USB-UART, USB HOST/DEVICE, CAN (on the MCU card, if supported), and Ethernet is also included. In addition, it also has the well-established mikroBUS™ standard, a standardized socket for the MCU card (SiBRAIN standard), and two display options for the TFT board line of products and character-based LCD. Fusion for STM32 v8 is an integral part of the Mikroe ecosystem for rapid development. Natively supported by Mikroe software tools, it covers many aspects of prototyping and development thanks to a considerable number of different Click boards™ (over a thousand boards), the number of which is growing every day.

Microcontroller Overview

MCU Card / MCU

Type

8th Generation

Architecture

ARM Cortex-M4

MCU Memory (KB)

2048

Silicon Vendor

STMicroelectronics

Pin count

144

RAM (Bytes)

262144

Used MCU Pins

mikroBUS™ mapper

RST

Data Signal

PA4

SCK

MISO

MOSI

Power Supply

3.3V

Ground

GND

PWM

Data Signal

PD3

INT

SCL

SDA

Power Supply

Ground

GND

Take a closer look

Schematic

Step by step

Project assembly

Fusion for PIC v8 front image hardware assembly

Start by selecting your development board and Click board™. Begin with the Fusion for STM32 v8 as your development board.

NECTO Output Selection Step Image hardware assembly

In the advanced settings, pay special attention to the Redirect standard output field. By default, it is set to Application output as the method of displaying final results. To show results via a UART terminal, select the “UART” option in that field and click the “SAVE” button. You will be returned to the Compiler field, and now you can move on to the next step by pressing the “NEXT” button.

Buck 22 Click front image hardware assembly

SiBRAIN for PIC32MZ1024EFK144 front image hardware assembly

v8 SiBRAIN MB 1 - upright/background hardware assembly

NECTO Compiler Selection Step Image hardware assembly

Track your results in real time

Application Output

After pressing the "FLASH" button on the left-side panel, it is necessary to open the UART terminal to display the achieved results. By clicking on the Tools icon in the right-hand panel, multiple different functions are displayed, among which is the UART Terminal. Click on the offered "UART Terminal" icon.

Once the UART terminal is opened, the window takes on a new form. At the top of the tab are two buttons, one for adjusting the parameters of the UART terminal and the other for connecting the UART terminal. The tab's lower part is reserved for displaying the achieved results. Before connecting, the terminal has a Disconnected status, indicating that the terminal is not yet active. Before connecting, it is necessary to check the set parameters of the UART terminal. Click on the "OPTIONS" button.

In the newly opened UART Terminal Options field, we check if the terminal settings are correct, such as the set port and the Baud rate of UART communication. If the data is not displayed properly, it is possible that the Baud rate value is not set correctly and needs to be adjusted to 115200. If all the parameters are set correctly, click on "CONFIGURE".

The next step is to click on the "CONNECT" button, after which the terminal status changes from Disconnected to Connected in green, and the data is displayed in the Received data field.

Software Support

Library Description

This library contains API for DHT22 Click driver.

Key functions:

dht22_start_signal - Sends start signal to the sensor function
dht22_check_sensor_response - Release the bus to wait the sensor response signal function
dht22_get_sensor_data - Reading data from the sensor function

Open Source

Code example

This example can be found in NECTO Studio. Feel free to download the code, or you can copy the code below.

/*!
 * \file 
 * \brief DHT22 Click example
 *
 * # Description
 * This is a example which demonstrates the use of DHT22 Click board by
 * measuring temperature and relative humidity.
 *
 * The demo application is composed of two sections :
 *
 * ## Application Init
 * Initializes the SDA data pin depending on the selected GPIO pin (SDA1/SDA2)
 * and log module.
 *
 * ## Application Task
 * Reads the temperature and humidity from the sensor and 
 * displays the values on the USB UART.
 *
 * \author Nemanja Medakovic
 *
 */

#include "board.h"
#include "log.h"
#include "dht22.h"

static dht22_t dht22;
static log_t logger;

void application_init ( void )
{
    log_cfg_t log_cfg;

    /** 
     * Logger initialization.
     * Default baud rate: 115200
     * Default log level: LOG_LEVEL_DEBUG
     * @note If USB_UART_RX and USB_UART_TX 
     * are defined as HAL_PIN_NC, you will 
     * need to define them manually for log to work. 
     * See @b LOG_MAP_USB_UART macro definition for detailed explanation.
     */
    LOG_MAP_USB_UART( log_cfg );
    log_init( &logger, &log_cfg );
    log_info( &logger, "---- Application Init... ----" );

    dht22_cfg_t dht22_cfg;

    //  Click initialization.

    dht22_cfg_setup( &dht22_cfg );
    DHT22_MAP_MIKROBUS( dht22_cfg, MIKROBUS_1 );

    if ( dht22_init( &dht22, &dht22_cfg ) == DHT22_ERROR )
    {
        log_info( &logger, "---- Application Init Error. ----" );
        log_info( &logger, "---- Please, run program again... ----" );

        for ( ; ; );
    }

    log_info( &logger, "---- Application Init done. ----" );
}

void application_task ( void )
{
    uint8_t resp_stat = DHT22_RESP_NOT_READY;
    uint32_t sens_meas = 0;
    float dht22_temp = 0;
    float dht22_hum = 0;
    
    dht22_init_sda_output( &dht22 );
    
    if ( dht22_start_signal( &dht22 ) == DHT22_OK )
    {
        dht22_init_sda_input( &dht22 );
        
        if ( dht22_check_sensor_response( &dht22, &resp_stat ) == DHT22_OK )
        {
            if ( resp_stat == DHT22_RESP_READY )
            {
                if ( dht22_get_sensor_data( &dht22, &sens_meas ) == DHT22_OK )
                {
                    dht22_temp = dht22_calculate_temperature( &dht22, sens_meas );
                    dht22_hum = dht22_calculate_humidity( &dht22, sens_meas );

                    log_printf( &logger, " Humidity : %.2f %%\r\n", dht22_hum );
                    log_printf( &logger, " Temperature : %.2f degC\r\n", dht22_temp );
                    log_printf( &logger, " ---------------------------\r\n", dht22_temp );
                    Delay_ms( 1000 );
                }
                
            }
        }
    }
}

void main ( void )
{
    application_init( );

    for ( ; ; )
    {
        application_task( );
    }
}

// ------------------------------------------------------------------------ END