Experience the future of temperature measurement with MAX31875 and STM32F302VC

Precision in every degree

Thermo 6 Click with CLICKER 4 for STM32F302VCT6

Published Jul 22, 2025

Click board™

Thermo 6 Click

Dev. board

CLICKER 4 for STM32F302VCT6

Compiler

NECTO Studio

MCU

STM32F302VC

We empower you with real-time temperature data to make informed decisions and keep your environment at the perfect temperature

Hardware Overview

How does it work?

Thermo 6 Click is based on the MAX31875, a temperature sensor from Analog Devices, which has only four connections, two of which are used for the power supply and the other two are the standard I2C interface lines: SDA and SCL. The normal transaction consists of two bytes long reads and writes as the registers are 16 bits wide. There are 8 different factory predefined I2C addresses, so the exact sensor I2C address can be determined by checking the part I2C address table in the datasheet. The sensor is exposed on a specially designed PCB, so the measurement of the ambient temperature can remain accurate and without interference. Sensor measures its die temperature and converts the thermal measurement into a digital information, which can be accessed via the I2C/SMBus interface. Information is stored in the temperature register, in MSB - LSB format. In addition to the normal

temperature data format, there is an optional extended data format, which allows temperatures greater than +128 C to be read. The temperature format and other sensor settings can be configured via the configuration registers. Check the MAX31875 datasheet for more detailed information. All of the power down, standby, read and write commands are intelligently managed, so the device is waiting for the pending communication to be completed, before executing those commands. Also, while reading the thermal data, the conversion process is halted, so the value won't change before the reading is completed. The MAX31875 temperature sensor can be set to sample the thermal data with 8bit, 9bit, 10bit and 12bit resolution. Using the higher precision conversion directly affects the power consumption, so if there is a demand for the low power application, resolution can be set down to

8bit. Power consumption can be reduced even further, by using the lower sample rate, which results in longer idle periods. While idling, the power consumption of the sensor itself goes down to 500 nA. One shot reading allows for the lowest power consumption - down to 5uA, if there is no demand for continuous temperature conversion. The device remains in standby state, as long as there is no read command. Read command (writing 1 to the bit 0 of the config register) will wake up the device and read the temperature data immediately, after which it will revert to standby mode again. This allows for a very low average power consumption. Other advanced features such as the PEC, I2C bus timeout reset, temperature comparator, can also be configured by setting the corresponding bits of the config registers.

Features overview

Development board

Clicker 4 for STM32F3 is a compact development board designed as a complete solution, you can use it to quickly build your own gadgets with unique functionalities. Featuring a STM32F302VCT6, four mikroBUS™ sockets for Click boards™ connectivity, power managment, and more, it represents a perfect solution for the rapid development of many different types of applications. At its core, there is a STM32F302VCT6 MCU, a powerful microcontroller by STMicroelectronics, based on the high-

performance Arm® Cortex®-M4 32-bit processor core operating at up to 168 MHz frequency. It provides sufficient processing power for the most demanding tasks, allowing Clicker 4 to adapt to any specific application requirements. Besides two 1x20 pin headers, four improved mikroBUS™ sockets represent the most distinctive connectivity feature, allowing access to a huge base of Click boards™, growing on a daily basis. Each section of Clicker 4 is clearly marked, offering an intuitive and clean interface. This makes working with the development

board much simpler and thus, faster. The usability of Clicker 4 doesn’t end with its ability to accelerate the prototyping and application development stages: it is designed as a complete solution which can be implemented directly into any project, with no additional hardware modifications required. Four mounting holes [4.2mm/0.165”] at all four corners allow simple installation by using mounting screws. For most applications, a nice stylish casing is all that is needed to turn the Clicker 4 development board into a fully functional, custom design.

CLICKER 4 for STM32F302VCT6 double image

Microcontroller Overview

MCU Card / MCU

Architecture

ARM Cortex-M4

MCU Memory (KB)

256

Silicon Vendor

STMicroelectronics

Pin count

100

RAM (Bytes)

40960

Used MCU Pins

mikroBUS™ mapper

RST

SCK

MISO

MOSI

Power Supply

3.3V

Ground

GND

PWM

INT

I2C Clock

PB10

SCL

I2C Data

PB11

SDA

Ground

GND

Take a closer look

Click board™ Schematic

Step by step

Project assembly

PIC32MZ MXS Data Capture Board front image hardware assembly

Start by selecting your development board and Click board™. Begin with the CLICKER 4 for STM32F302VCT6 as your development board.

Thermo 21 Click front image hardware assembly

Board mapper by product6 hardware assembly

PIC32MZ MXS Data Capture Board NECTO MCU Selection Step hardware assembly

Necto No Display image step 8 hardware assembly

Track your results in real time

Application Output

1. Application Output - In Debug mode, the 'Application Output' window enables real-time data monitoring, offering direct insight into execution results. Ensure proper data display by configuring the environment correctly using the provided tutorial.

2. UART Terminal - Use the UART Terminal to monitor data transmission via a USB to UART converter, allowing direct communication between the Click board™ and your development system. Configure the baud rate and other serial settings according to your project's requirements to ensure proper functionality. For step-by-step setup instructions, refer to the provided tutorial.

3. Plot Output - The Plot feature offers a powerful way to visualize real-time sensor data, enabling trend analysis, debugging, and comparison of multiple data points. To set it up correctly, follow the provided tutorial, which includes a step-by-step example of using the Plot feature to display Click board™ readings. To use the Plot feature in your code, use the function: plot(*insert_graph_name*, variable_name);. This is a general format, and it is up to the user to replace 'insert_graph_name' with the actual graph name and 'variable_name' with the parameter to be displayed.

Software Support

Library Description

This library contains API for Thermo 6 Click driver.

Key functions:

thermo6_get_temperature_data - Temperature function
thermo6_get_over_temp_status - Read over-temperature status function
thermo6_get_other_register - Set other register

Open Source

Code example

The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.

/*!
 * \file 
 * \brief Thermo6 Click example
 * 
 * # Description
 * Demo application shows ambient temperature reading using Thermo 6 Click.
 * 
 * The demo application is composed of two sections :
 * 
 * ## Application Init 
 * Configuring Clicks and log objects.
 * Setting the Click in the default configuration to start the measurement.
 * 
 * ## Application Task  
 *  It measures the temperature and logs a message about the current temperature.
 * 
 * \author Katarina Perendic
 *
 */
// ------------------------------------------------------------------- INCLUDES

#include "board.h"
#include "log.h"
#include "thermo6.h"

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

static thermo6_t thermo6;
static log_t logger;

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

void application_init ( void )
{
    log_cfg_t log_cfg;
    thermo6_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.

    thermo6_cfg_setup( &cfg );
    THERMO6_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    thermo6_init( &thermo6, &cfg );

    thermo6_default_cfg( &thermo6 );
    log_info( &logger, "---- Start measurement ----");
    Delay_ms ( 1000 );
}

void application_task ( void )
{
    float temperature;

    //  Task implementation.

    temperature = thermo6_get_temperature_data( &thermo6, THERMO6_TEMP_FORMAT_CELSIUS );
    log_printf( &logger, ">> Temperature is %.3f C \r\n", temperature );

    Delay_ms ( 1000 );
}

int main ( void ) 
{
    /* Do not remove this line or clock might not be set correctly. */
    #ifdef PREINIT_SUPPORTED
    preinit();
    #endif
    
    application_init( );
    
    for ( ; ; ) 
    {
        application_task( );
    }

    return 0;
}


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