Beginner
10 min

Create the ideal environment for a healthier, happier life with HDC2080 and STM32F302VC

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Temp&Hum 12 Click with CLICKER 4 for STM32F302VCT6

Published Jul 22, 2025

Click board™

Temp&Hum 12 Click

Dev. board

CLICKER 4 for STM32F302VCT6

Compiler

NECTO Studio

MCU

STM32F302VC

Our technology and your comfort are perfectly aligned, bringing you the best in climate control solutions.

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Hardware Overview

How does it work?

Temp&Hum 12 Click is based on the HDC2080, a Low Power Humidity and Temperature Digital Sensor from Texas Instruments. This sensor is factory calibrated to 2% relative humidity and 0.2°C temperature accuracy. It has an integrated heating element that is used to evaporate condensation, protecting the sensor that way. This heating element can be simply activated by setting a bit in the appropriate register. In the case when the heater is powered on, the typical current consumption is about 90mA. Internally, two sensors are connected to the two separated ADC sections, which can be set to sample measurements with the resolution of 9, 11 or 14 bits, based on the measurement time. The OTP memory holds the calibration coefficients that are applied to the measured value and the results are stored on the output registers, in the MSB/LSB format. These values are

then used in formulas found in the HDC2080 datasheet so that the final temperature or relative humidity data can be calculated. It is also possible to correct the offsets with custom values. HDC2080 IC uses the I2C protocol to communicate with the host MCU. Its I2C bus pins are routed to the mikroBUS™ I2C pins and are pulled to a HIGH logic level by the onboard resistors. The final I2C address of this IC is already determined by setting ADDR pin to GND (LOW logic level for 0). Temp&Hum 12 click supports programable temperature and humidity thresholds in the HDC2080 allow the device to send a hardware interrupt to wake up the microcontroller when necessary. In addition, the power consumption of the HDC2080 is significantly reduced, which helps to minimize self-heating and improve measurement accuracy. More information about these registers can be

found in the HDC2080 datasheet. HDC2080 IC itself is a very low power consumption device and it can work in two modes: sleep and active (measurement) mode. The device enters the sleep the mode as soon as possible, to save power. This makes the HDC2080 suitable to be used in battery-powered applications. In these applications, the HDC2080 spends most of the time in sleep mode, with the typical current consumption of 50 nA. While in the active mode, measurement can be configured either to automatic (with the predefined output data rate) or on-demand. In the automatic mode, the measurement is triggered in predefined time intervals, while on-demand measurement happens whenever the I2C command is sent. As soon as the single measurement is finished, the device falls back to the sleep mode.

Temp&Hum 12 Click hardware overview image

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

STM32F302VC Image

Architecture

ARM Cortex-M4

MCU Memory (KB)

256

Silicon Vendor

STMicroelectronics

Pin count

100

RAM (Bytes)

40960

Used MCU Pins

mikroBUS™ mapper

NC
NC
AN
NC
NC
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
Interrupt
PD0
INT
NC
NC
TX
NC
NC
RX
I2C Clock
PB10
SCL
I2C Data
PB11
SDA
NC
NC
5V
Ground
GND
GND
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Take a closer look

Click board™ Schematic

Temp&Hum 12 Click Schematic 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.

PIC32MZ MXS Data Capture Board front image hardware assembly
Thermo 21 Click front image hardware assembly
Board mapper by product6 hardware assembly
Necto image step 2 hardware assembly
Necto image step 3 hardware assembly
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Necto image step 5 hardware assembly
Necto image step 6 hardware assembly
PIC32MZ MXS Data Capture Board NECTO MCU Selection Step hardware assembly
Necto No Display image step 8 hardware assembly
Necto image step 9 hardware assembly
Necto image step 10 hardware assembly
Necto image step 11 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 Temp&Hum 12 Click driver.

Key functions:

  • temphum12_get_temperature - Temperature data

  • temphum12_get_humidity - Relative Huminidy data

  • temphum12_get_intrrupt_state - Interrupt state

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 TempHum12 Click example
 * 
 * # Description
 * This application measures temperature and humidity.
 *
 * The demo application is composed of two sections :
 * 
 * ## Application Init 
 * Initializes driver init and configuration device for measurement.
 * 
 * ## Application Task  
 * Reads Temperature and Humidity data and this data logs to the USBUART every 1 sec.
 * 
 * \author MikroE Team
 *
 */
// ------------------------------------------------------------------- INCLUDES

#include "board.h"
#include "log.h"
#include "temphum12.h"

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

static temphum12_t temphum12;
static log_t logger;

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

void application_init ( void )
{
    log_cfg_t log_cfg;
    temphum12_cfg_t cfg;
    uint16_t tmp;
    uint8_t read_reg[ 2 ];

    /** 
     * 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.

    temphum12_cfg_setup( &cfg );
    TEMPHUM12_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    temphum12_init( &temphum12, &cfg );

    temphum12_default_cfg( &temphum12 );
    
    Delay_ms ( 1000 );
    Delay_ms ( 500 );
    log_printf( &logger, "--- Start measurement ----\r\n" );
}

void application_task ( void )
{
    float temperature;
    float humidity;

    temperature = temphum12_get_temperature( &temphum12, 
                                             TEMPHUM12_TEMP_IN_CELSIUS );

    log_printf( &logger, "Temperature: %.2f \r\n", temperature );
    Delay_1sec( );
    
    humidity = temphum12_get_humidity( &temphum12 );

    log_printf( &logger, "Humidity: %.2f \r\n", humidity );
    
    log_printf( &logger, "-----------------------------\r\n" );
    Delay_1sec( );
}

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

Additional Support

Resources

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