Accomplish accurate rotary and linear position detection with TMAG5253 and ATmega32
Linear Hall effect sensor that responds proportionally to magnetic flux density
Published Dec 21, 2023
Click board™
LIN Hall 2 Click
Dev. board
EasyAVR v7
Compiler
NECTO Studio
MCU
ATmega32
Detect the straight-line movement of a magnet or determine the rotational position of a rotary application
A
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Hardware Overview
How does it work?
LIN Hall 2 Click is based on the TMAG5253, a low-power linear Hall-effect sensor from Texas Instruments. This device uses a ratiometric architecture to eliminate errors from VCC tolerance, as the external analog-to-digital converter (ADC) uses the same VCC for its reference. Additionally, the device features magnet temperature compensation for NdFeB and Ferrite to counteract the magnetic sensitivity drifts across a wide temperature range. It fully integrates the signal
conditioning, temperature compensation circuits, mechanical stress cancellation, and output driver. The TMAG5253 is sensitive to the magnetic field component perpendicular to the sensor's top side. It also has a bipolar sensitivity where the north and south magnetic poles produce unique output voltages. LIN Hall 2 Click uses an analog-to-digital converter (ADC) of the host MCU to read the analog values of the TMAG5253. The enable EN pin allows you to put the device in an ultra-low
power (nA) mode when needed. 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.
Features overview
Development board
EasyAVR v7 is the seventh generation of AVR development boards specially designed for the needs of rapid development of embedded applications. It supports a wide range of 16-bit AVR microcontrollers from Microchip and has a broad set of unique functions, such as a powerful onboard mikroProg programmer and In-Circuit debugger over USB. The development board is well organized and designed so that the end-user has all the necessary elements in one place, such as switches, buttons, indicators, connectors, and others. With four different connectors for each port, EasyAVR v7 allows you to connect accessory boards, sensors, and custom electronics more
efficiently than ever. Each part of the EasyAVR v7 development board contains the components necessary for the most efficient operation of the same board. An integrated mikroProg, a fast USB 2.0 programmer with mikroICD hardware In-Circuit Debugger, offers many valuable programming/debugging options and seamless integration with the Mikroe software environment. Besides it also includes a clean and regulated power supply block for the development board. It can use a wide range of external power sources, including an external 12V power supply, 7-12V AC or 9-15V DC via DC connector/screw terminals, and a power source via the USB Type-B (USB-B)
connector. Communication options such as USB-UART and RS-232 are also included, alongside the well-established mikroBUS™ standard, three display options (7-segment, graphical, and character-based LCD), and several different DIP sockets which cover a wide range of 16-bit AVR MCUs. EasyAVR v7 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.
Microcontroller Overview
MCU Card / MCU
Architecture
AVR
MCU Memory (KB)
32
Silicon Vendor
Microchip
Pin count
40
RAM (Bytes)
2048
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 EasyAVR v7 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 LIN Hall 2 Click driver.
Key functions:
linhall2_read_an_pin_voltage- LIN Hall 2 read AN pin voltage level function.linhal2_set_en_pin- LIN Hall 2 set EN pin state function.linhal2_get_flux_density- LIN Hall 2 read flux density function.
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 LIN Hall 2 Click Example.
*
* # Description
* This is an example which demonstrates the use of LIN Hall 2 Click board by measuring
* magnetic field density and showing it in mT as well as detecting the orientation of the magnet.
*
* The demo application is composed of two sections :
*
* ## Application Init
* The initialization of ADC module and log UART.
*
* ## Application Task
* The demo application reads the Magnetic field density and showing it in mT
* as well as the orientation of the magnet.
*
* @author Stefan Ilic
*
*/
#include "board.h"
#include "log.h"
#include "linhall2.h"
static linhall2_t linhall2; /**< LIN Hall 2 Click driver object. */
static log_t logger; /**< Logger object. */
void application_init ( void )
{
log_cfg_t log_cfg; /**< Logger config object. */
linhall2_cfg_t linhall2_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.
linhall2_cfg_setup( &linhall2_cfg );
LINHALL2_MAP_MIKROBUS( linhall2_cfg, MIKROBUS_1 );
if ( ADC_ERROR == linhall2_init( &linhall2, &linhall2_cfg ) )
{
log_error( &logger, " Communication init." );
for ( ; ; );
}
linhal2_set_en_pin( &linhall2, LINHALL2_ENABLE_DEVICE );
log_info( &logger, " Application Task " );
}
void application_task ( void )
{
float mag_flux = 0;
if ( LINHALL2_OK == linhal2_get_flux_density ( &linhall2, &mag_flux ) )
{
log_printf( &logger, " Magnetic flux density: %.3f[mT]\r\n", mag_flux );
if ( 0 < mag_flux )
{
log_printf( &logger, " Magnetic field oriented South \r\n\n" );
}
else
{
log_printf( &logger, " Magnetic field oriented North \r\n\n" );
}
Delay_ms( 1000 );
}
}
void main ( void )
{
application_init( );
for ( ; ; )
{
application_task( );
}
}
// ------------------------------------------------------------------------ END
