Beginner
10 min
0

Experience the future of climate control with SHT31-DIS and STM32F101ZG

Climate control, simplified.

SHT Click with UNI Clicker

Published Nov 02, 2023

Click board™

SHT Click

Development board

UNI Clicker

Compiler

NECTO Studio

MCU

STM32F101ZG

Our temperature and humidity sensing solution combines cutting-edge precision with unparalleled comfort, ensuring the perfect environment for your well-being

A

A

Hardware Overview

How does it work?

SHT Click is based on the SHT31-DIS, a humidity and temperature sensor from Sensirion. The SHT31-DIS is a robust and reliable sensor, and even when exposed to conditions outside its normal range, it can recalibrate itself once conditions stabilize. The sensor performs best when operated within the recommended normal temperature and humidity range of 5°C up to 60°C and 20%RH up to 80%RH, respectively. Long-term exposure to conditions outside the normal range, especially at high humidity, may temporarily offset the RH signal. After returning to the normal temperature

and humidity range, the sensor will slowly return to a calibration state by itself. Also, note that prolonged exposure to extreme conditions may accelerate aging. The SHT Click communicates with the host MCU using an I2C interface over the mikroBUS™ socket, with communication speeds of up to 1MHz. This Click board™ allows the selection of one of two available I2C addresses via the ADDR jumper, where I2C address 0 is selected by default. To reset the SHT31-DIS sensor, there is an RST pin with an active LOW state. The SHT31-DIS also features alert functions and can send

interrupt signals over the INT pin of the mikroBUS™ socket. The output of this pin depends on the RH/T reading relative to programmable limits. This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the PWR SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. Also, this 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.

SHT Click hardware overview image

Features overview

Development board

UNI Clicker is a compact development board designed as a complete solution that brings the flexibility of add-on Click boards™ to your favorite microcontroller, making it a perfect starter kit for implementing your ideas. It supports a wide range of microcontrollers, such as different ARM, PIC32, dsPIC, PIC, and AVR from various vendors like Microchip, ST, NXP, and TI (regardless of their number of pins), four mikroBUS™ sockets for Click board™ connectivity, a USB connector, LED indicators, buttons, a debugger/programmer connector, and two 26-pin headers for interfacing with external electronics. Thanks to innovative manufacturing technology, it allows you to build

gadgets with unique functionalities and features quickly. Each part of the UNI Clicker development kit contains the components necessary for the most efficient operation of the same board. In addition to the possibility of choosing the UNI Clicker programming method, using a third-party programmer or CODEGRIP/mikroProg connected to onboard JTAG/SWD header, the UNI Clicker board also includes a clean and regulated power supply module for the development kit. It provides two ways of board-powering; through the USB Type-C (USB-C) connector, where onboard voltage regulators provide the appropriate voltage levels to each component on the board, or using a Li-Po/Li

Ion battery via an onboard battery connector. All communication methods that mikroBUS™ itself supports are on this board (plus USB HOST/DEVICE), including the well-established mikroBUS™ socket, a standardized socket for the MCU card (SiBRAIN standard), and several user-configurable buttons and LED indicators. UNI Clicker is an integral part of the Mikroe ecosystem, allowing you to create a new application in minutes. Natively supported by Mikroe software tools, it covers many aspects of prototyping thanks to a considerable number of different Click boards™ (over a thousand boards), the number of which is growing every day.

UNI clicker double image

Microcontroller Overview

MCU Card / MCU

default

Type

8th Generation

Architecture

ARM Cortex-M3

MCU Memory (KB)

1024

Silicon Vendor

STMicroelectronics

Pin count

144

RAM (Bytes)

81920

Used MCU Pins

mikroBUS™ mapper

NC
NC
AN
Reset
PE13
RST
NC
NC
CS
NC
NC
SCK
NC
NC
MISO
NC
NC
MOSI
Power Supply
3.3V
3.3V
Ground
GND
GND
NC
NC
PWM
Alarm Interrupt
PG6
INT
NC
NC
TX
NC
NC
RX
I2C Clock
PB8
SCL
I2C Data
PB9
SDA
Power Supply
5V
5V
Ground
GND
GND
1

Take a closer look

Schematic

SHT Click Schematic schematic

Step by step

Project assembly

UNI Clicker front image hardware assembly

Start by selecting your development board and Click board™. Begin with the UNI Clicker as your development board.

UNI Clicker front image hardware assembly
Thermo 28 Click front image hardware assembly
SiBRAIN for STM32F745VG front image hardware assembly
Prog-cut hardware assembly
UNI Clicker MB 1 - upright/with-background hardware assembly
Necto image step 2 hardware assembly
Necto image step 3 hardware assembly
Necto image step 4 hardware assembly
Necto image step 5 hardware assembly
Necto image step 6 hardware assembly
Necto image step 7 hardware assembly
Necto No Display image step 8 hardware assembly
Necto image step 9 hardware assembly
Necto image step 10 hardware assembly
Debug Image Necto Step hardware assembly

Track your results in real time

Application Output

After loading the code example, pressing the "DEBUG" button builds and programs it on the selected setup.

Application Output Step 1

After programming is completed, a header with buttons for various actions available in the IDE appears. By clicking the green "PLAY "button, we start reading the results achieved with Click board™.

Application Output Step 3

Upon completion of programming, the Application Output tab is automatically opened, where the achieved result can be read. In case of an inability to perform the Debug function, check if a proper connection between the MCU used by the setup and the CODEGRIP programmer has been established. A detailed explanation of the CODEGRIP-board connection can be found in the CODEGRIP User Manual. Please find it in the RESOURCES section.

Application Output Step 4

Software Support

Library Description

This library contains API for SHT Click driver.

Key functions:

  • sht_temp_ss - Returns temperature measurement in single shot mode.

  • sht_hum_ss - Returns humidity measurement in single shot mode.

  • sht_heater_control - Sets the heater state.

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 Sht Click example
 * 
 * # Description
 * This application enables usage of the temperature and humidity sensor.
 *
 * The demo application is composed of two sections :
 * 
 * ## Application Init 
 * Initialize the communication interface and configure the click board.
 * 
 * ## Application Task  
 * Temperature and humidity data is measured and read from
 * the sensor. After the data has been read it is displayed
 * on the serial port.
 * 
 * 
 * \author MikroE Team
 *
 */
// ------------------------------------------------------------------- INCLUDES

#include "board.h"
#include "log.h"
#include "sht.h"

// ------------------------------------------------------------------ VARIABLES

static sht_t sht;
static log_t logger;

// ------------------------------------------------------ APPLICATION FUNCTIONS

void application_init ( void )
{
    log_cfg_t log_cfg;
    sht_cfg_t 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 ----" );

    //  Click initialization.

    sht_cfg_setup( &cfg );
    SHT_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    sht_init( &sht, &cfg );
    
    sht_reset( &sht );
    sht_hw_reset( &sht );
}

void application_task ( void )
{
    //  Task implementation.

    float temperature;
    float humidity;

    Delay_ms( 1500 );

    temperature = sht_temp_ss( &sht );
    log_printf( &logger, "Temperature: %.2f C \r\n", temperature );

    Delay_ms( 200 );

    humidity = sht_hum_ss( &sht );
    log_printf( &logger, "Humidity: %.2f %% \r\n", humidity );

    Delay_ms( 200 );
}

void main ( void )
{
    application_init( );

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


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

Additional Support

Resources