Achieve exceptional accuracy in angle detection with A1335 and STM32L496AG
Magnet whisperer
Published Jul 22, 2025
Click board™
Angle Click
Dev. board
Discovery kit with STM32L496AG MCU
Compiler
NECTO Studio
MCU
STM32L496AG
Harness the power of Hall effect technology to achieve accurate magnet angle sensing for your projects, enabling advanced control and measurement capabilities in a wide range of applications
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Hardware Overview
How does it work?
Angle Click is based on the A1335, a precision Hall-effect angle sensor from Allegro Microsystems. It features a Circular Vertical Hall (CVH) technology, a high-speed sampling AD converter, a 32-bit MCU for data processing, EEPROM, and the section used for the I2C/SPI communication. The CVH sensor detects the rotation of the magnetic field by utilizing the effect the magnetic field produces on the electron flow within the sensor while the current flows through it. The signal from the sensor is then digitized by the AD converter and
handed to the digital front end of the IC. The digitalized signal is preconditioned and processed through the bandpass filter, and the raw value of the angle is calculated. The value is then forwarded to the MCU unit. It is submitted to various processing steps, depending on the register values set by the user. Angle Click can communicate with the host MCU using the SPI serial or I2C interfaces. The selection can be made over five COMM SEL jumpers. The I2C, which can support a clock frequency of up to 400kHz, is
selected by default. Over the ADDR SEL jumpers, you can set the I2C address (0s set by default). If your choice is the SPI, then you can count on 10MHz of clock frequency. This Click board™ can operate with either 3.3V or 5V logic voltage levels. 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.
Features overview
Development board
The 32L496GDISCOVERY Discovery kit serves as a comprehensive demonstration and development platform for the STM32L496AG microcontroller, featuring an Arm® Cortex®-M4 core. Designed for applications that demand a balance of high performance, advanced graphics, and ultra-low power consumption, this kit enables seamless prototyping for a wide range of embedded solutions. With its innovative energy-efficient
architecture, the STM32L496AG integrates extended RAM and the Chrom-ART Accelerator, enhancing graphics performance while maintaining low power consumption. This makes the kit particularly well-suited for applications involving audio processing, graphical user interfaces, and real-time data acquisition, where energy efficiency is a key requirement. For ease of development, the board includes an onboard ST-LINK/V2-1
debugger/programmer, providing a seamless out-of-the-box experience for loading, debugging, and testing applications without requiring additional hardware. The combination of low power features, enhanced memory capabilities, and built-in debugging tools makes the 32L496GDISCOVERY kit an ideal choice for prototyping advanced embedded systems with state-of-the-art energy efficiency.
Microcontroller Overview
MCU Card / MCU
Architecture
ARM Cortex-M4
MCU Memory (KB)
1024
Silicon Vendor
STMicroelectronics
Pin count
169
RAM (Bytes)
327680
Used MCU Pins
mikroBUS™ mapper
Take a closer look
Click board™ Schematic
Step by step
Project assembly
Start by selecting your development board and Click board™. Begin with the Discovery kit with STM32L496AG MCU as your development board.
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 Angle Click driver.
Key functions:
angle_get_angle- This function reads angle valueangle_get_temperature- This function reads temperature valueangle_get_magnetics- This function reads magnetics value.
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 Angle Click example
*
* # Description
* Angle Click is a precise Hall-effect angle sensing Click board that can be used to measure the rotational angle
* of the magnetic field in the X-Y plane above it (parallel to the surface of the Click), through the whole range of 360°.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Driver intialization and Angle settings mode.
*
* ## System Initialization
* Intializes I2C module.
*
* ## Application Task
* Reads encoded Angle in degreeses and Magnetic data in gauss.
*
* \author MikroE Team
*
*/
// ------------------------------------------------------------------- INCLUDES
#include "board.h"
#include "log.h"
#include "angle.h"
// ------------------------------------------------------------------ VARIABLES
static angle_t angle;
static log_t logger;
uint16_t angle_val;
uint16_t magnetics_val;
// ------------------------------------------------------ APPLICATION FUNCTIONS
void application_init ( void )
{
log_cfg_t log_cfg;
angle_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.
angle_cfg_setup( &cfg );
ANGLE_MAP_MIKROBUS( cfg, MIKROBUS_1 );
angle_init( &angle, &cfg );
angle_default_cfg ( &angle );
}
void application_task ( void )
{
angle_val = angle_get_angle( &angle );
log_printf( &logger, "Angle :%d \r\n", angle_val );
magnetics_val = angle_get_magnetics( &angle );
log_printf( &logger, "Magnetics :%d \r\n", magnetics_val );
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
Additional Support
Resources
Category:Magnetic
