30 min

Experience the future of magnetic field detection with ALS31300 and STM32L041C6

A new dimension of insight: Discover our 3D magnetic sensor's X, Y, and Z capabilities

3D Hall 9 Click with Fusion for STM32 v8

Published Sep 28, 2023

Click board™

3D Hall 9 Click

Development board

Fusion for STM32 v8


NECTO Studio



From industrial automation to scientific research, our 3D magnetic field strength detector opens doors to endless possibilities, ensuring accurate measurements across all three dimensions



Hardware Overview

How does it work?

3D Hall 9 Click is based on the ALS31300, a 3D linear Hall-effect sensor used to detect the strength of a magnetic field in all three dimensions (X, Y, and Z axes) from Allegro Microsystems. The ALS31300 provides a 12-bit digital output value proportional to the magnetic field generally applied to any of the Hall elements alongside a 12-bit temperature output representing the junction temperature of the IC. The quiescent output value (zero magnetic fields used) is at mid-scale. The ALS31300 has a factory-programmed sensitivity range of ±500G, suitable for 3D linear or 2D angle sensing applications. Power management on the ALS31300 is user-selectable and highly configurable, allowing for system-level optimization of current consumption and performance. It supports three power modes: Active, Sleep, and Low-Power Duty Cycle Mode (LPDCM). The operating mode of the ALS31300 will

be determined by the selected proper value of the 0x27 register. More information on the operational modes can be found in the attached datasheet. 3D Hall 9 Click communicates with MCU using the standard I2C 2-Wire interface to read data and configure settings, supporting Standard Mode operation with a clock frequency of 100kHz and Fast Mode up to 400kHz. It provides data in digital format of 12 bits corresponding to the magnetic field measured in each X, Y, and Z axes. The ALS31300 also requires a supply voltage of 3V to work regularly. Therefore, a small LDO regulator, NCP170 from ON Semiconductor, provides a 3V out of mikroBUS™ 3V3 power rail. This Click board™ also uses the Enable pin labeled as EN and routed to the CS pin of the mikroBUS™ socket to optimize power consumption, used for its power ON/OFF purposes. The ALS31300 provides the ability to set different I2C slave addresses (16

unique addresses) by populating the appropriate resistors (R8 and R6), thus forming a voltage divider with a voltage value that corresponds to the desired I2C address. It also possesses an additional interrupt signal, routed on the INT pin of the mikroBUS™ socket. It integrates the detection and reporting of significant changes in an applied magnetic field (independently turned on or off for each of the three axes). An interrupt event is initiated when the applied magnetic field forces the ADC output to a value greater than or equal to the user-programmed threshold. This Click board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. Also, it comes equipped with a library containing functions and an example code that can be used as a reference for further development.

3D Hall 9 Click top side image
3D Hall 9 Click bottom side image

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.

Fusion for STM32 v8 horizontal image

Microcontroller Overview

MCU Card / MCU



8th Generation


ARM Cortex-M0

MCU Memory (KB)


Silicon Vendor


Pin count


RAM (Bytes)


Used MCU Pins

mikroBUS™ mapper

Power Supply
I2C Clock
I2C Data

Take a closer look


3D Hall 9 Click Schematic 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.

Fusion for PIC v8 front image hardware assembly
Buck 22 Click front image hardware assembly
SiBRAIN for PIC32MZ1024EFK144 front image hardware assembly
v8 SiBRAIN MB 1 - upright/background hardware assembly
Necto image step 2 hardware assembly
Necto image step 3 hardware assembly
Necto image step 4 hardware assembly
NECTO Compiler Selection Step Image hardware assembly
NECTO Output Selection Step Image hardware assembly
Necto image step 6 hardware assembly
Necto image step 7 hardware assembly
Necto image step 8 hardware assembly
Necto image step 9 hardware assembly
Necto image step 10 hardware assembly
Necto PreFlash 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.

UART Application Output Step 1

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.

UART Application Output Step 2

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".

UART Application Output Step 3

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.

UART Application Output Step 4

Software Support

Library Description

This library contains API for 3D Hall 9 Click driver.

Key functions:

  • c3dhall9_write_register - This function writes a desired data to the selected register by using I2C serial interface.

  • c3dhall9_read_register - This function reads a desired data from the selected register by using I2C serial interface.

  • c3dhall9_read_data - This function reads new data which consists of X, Y, and Z axis values in Gauss, and temperature in Celsius. It also calculates the angles between all axes in Degrees based on the raw axes data read.

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 main.c
 * @brief 3DHall9 Click example
 * # Description
 * This example demonstrates the use of 3D Hall 9 click board by reading the magnetic
 * flux density from 3 axes as well as the angles between axes and the sensor temperature.
 * The demo application is composed of two sections :
 * ## Application Init
 * Initializes the driver and the click board.
 * ## Application Task
 * Reads the new data from the sensor approximately every 300ms and displays 
 * the measurement values on the USB UART.  
 * @author Stefan Filipovic

#include "board.h"
#include "log.h"
#include "c3dhall9.h"

static c3dhall9_t c3dhall9;
static log_t logger;

void application_init ( void ) 
    log_cfg_t log_cfg;  /**< Logger config object. */
    c3dhall9_cfg_t c3dhall9_cfg;  /**< Click config object. */

     * 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.
    c3dhall9_cfg_setup( &c3dhall9_cfg );
    C3DHALL9_MAP_MIKROBUS( c3dhall9_cfg, MIKROBUS_1 );
    if ( I2C_MASTER_ERROR == c3dhall9_init( &c3dhall9, &c3dhall9_cfg ) ) 
        log_error( &logger, " Communication init." );
        for ( ; ; );
    if ( C3DHALL9_ERROR == c3dhall9_default_cfg ( &c3dhall9 ) )
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    log_info( &logger, " Application Task " );

void application_task ( void ) 
    c3dhall9_data_t sensor_data;
    if ( C3DHALL9_OK == c3dhall9_read_data ( &c3dhall9, &sensor_data ) )
        log_printf( &logger, " X-axis: %.1f Gauss\r\n", sensor_data.x_axis );
        log_printf( &logger, " Y-axis: %.1f Gauss\r\n", sensor_data.y_axis );
        log_printf( &logger, " Z-axis: %.1f Gauss\r\n", sensor_data.z_axis );
        log_printf( &logger, " Angle XY: %.1f Degrees\r\n", sensor_data.angle_xy );
        log_printf( &logger, " Angle XZ: %.1f Degrees\r\n", sensor_data.angle_xz );
        log_printf( &logger, " Angle YZ: %.1f Degrees\r\n", sensor_data.angle_yz );
        log_printf( &logger, " Temperature: %.2f Celsius\r\n\n", sensor_data.temperature );
        Delay_ms ( 300 );

void main ( void ) 
    application_init( );

    for ( ; ; ) 
        application_task( );

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

Additional Support