Ensure precise measurements over the full spectrum of magnet rotation with AEAT-9922 and STM32F303RC
360 degrees of precision
Published Sep 28, 2023
Click board™
Magnetic Rotary 2 Click
Dev. board
UNI Clicker
Compiler
NECTO Studio
MCU
STM32F303RC
Our angular magnetic rotary sensor sets a new standard for accuracy, providing seamless and precise angular measurements over a full 360 degrees of magnet rotation
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Hardware Overview
How does it work?
Magnetic Rotary 2 Click is based on the AEAT-9922, an angular magnetic rotary sensor manufactured with a CMOS standard process providing accurate angular measurement over a full 360 degrees of rotation from Broadcom Limited. It can accurately measure a magnet's rotational angle when aligned and perpendicular to the device by using its integrated Hall sensors to detect its magnetic field. The detected magnetic signals are then taken as input signals to be properly conditioned to negate their non-idealities before inputting them into the analog amplifiers for strength amplification and filtering. After which, the amplified analog signals are fed into the internal analog-to-digital converter (ADC) to be converted into digital signals for the final digital processing stage. A simple two-pole magnet generates the necessary magnetic field by rotating it perpendicularly. Wide magnetic field sensor configurations allow On-Axis (end of shaft) or Off-Axis (side of the shaft) modes in application. The used magnet should have sufficient
magnetic field strength (mT) to generate the magnetic field for signal generation. The device provides digital information of magnetic field strength high and magnetic field strength low to indicate whether the magnets are too close or far away from our device's surface. Magnetic Rotary 2 Click communicates with MCU through a standard SPI interface supporting the common SPI mode, SPI Mode 1. Digital processing provides a digitized output of the absolute and incremental signals. Each output is configurable via CS pin, MSEL (Mode Selection for desirable protocol) jumper, and AEAT-9922 internal PSEL registers configurable through memory. In addition, an absolute angular representation can also be selected using a pulse width modulated (PWM) signal by populating an onboard R2 resistor, which provides an instant indication of the magnet's angular position with a selectable and one-time programmable resolution from 10 to 18 bits. Alongside this feature, the communication error signal labeled as ERR and routed on the INT pin of
the mikroBUS™ socket can be activated by populating the onboard R3 resistor. The incremental outputs are available from digital outputs of their respective A, B, and I pins, the same for the U, V, and W commutation signals routed to the upper-right side onboard header. The incremental positions are indicated on ABI and UVW signals with a comprehensive user-configurable resolution from 1CPR, up to 10,000CPR of ABI signals, and pole pairs from 1 to 32 pole pairs (from 2 to 64 poles) for UVW commutation signals. This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VCC 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.
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.
Microcontroller Overview
MCU Card / MCU
Type
8th Generation
Architecture
ARM Cortex-M4
MCU Memory (KB)
256
Silicon Vendor
STMicroelectronics
Pin count
64
RAM (Bytes)
49152
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 UNI Clicker 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 Magnetic Rotary 2 Click driver.
Key functions:
magneticrotary2_write_register- This function writes a data byte to the selected register by using SPI serial interfacemagneticrotary2_read_register- This function reads a data byte from the selected register by using SPI serial interfacemagneticrotary2_get_angle- This function reads the absolute position raw data and converts it to degrees (Angle)
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 main.c
* @brief MagneticRotary2 Click example
*
* # Description
* This example demonstrates the use of Magnetic Rotary 2 Click board by reading and displaying
* the magnet's angular position in degrees.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initializes the driver and performs the Click default configuration.
*
* ## Application Task
* Reads the magnet's angular position in degrees every 100ms and displays the results on the USB UART.
*
* @author Stefan Filipovic
*
*/
#include "board.h"
#include "log.h"
#include "magneticrotary2.h"
static magneticrotary2_t magneticrotary2;
static log_t logger;
void application_init ( void )
{
log_cfg_t log_cfg; /**< Logger config object. */
magneticrotary2_cfg_t magneticrotary2_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.
magneticrotary2_cfg_setup( &magneticrotary2_cfg );
MAGNETICROTARY2_MAP_MIKROBUS( magneticrotary2_cfg, MIKROBUS_1 );
if ( SPI_MASTER_ERROR == magneticrotary2_init( &magneticrotary2, &magneticrotary2_cfg ) )
{
log_error( &logger, " Communication init." );
for ( ; ; );
}
if ( MAGNETICROTARY2_ERROR == magneticrotary2_default_cfg ( &magneticrotary2 ) )
{
log_error( &logger, " Default configuration." );
for ( ; ; );
}
log_info( &logger, " Application Task " );
}
void application_task ( void )
{
float angle = 0;
if ( MAGNETICROTARY2_OK == magneticrotary2_get_angle ( &magneticrotary2, &angle ) )
{
log_printf( &logger, " Angle: %.2f degrees\r\n\n", angle );
Delay_ms ( 100 );
}
}
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
