MAGNETO 2 click

In combination with the correct library, the magnetic flux density of a small magnet (diametral magnetisation) rotating above the IC can be measured in a non-contacting way.
The sensor enables the design of novel generation of non-contacting rotary position sensors that are frequently required for both automotive and industrial applications.
Magneto 2 click communicates with the target MCU through the mikroBUS™ SPI bus. The board is designed to use a 5V power supply only.

Specification

Documentation

Magneto 2 click is a mikroBUS™ add-on board with Melexis's MLX90316 monolithic rotary position sensor.

Sensing flux density with the IC surface of the MLX90316 allows the click to decode the absolute rotary (angular) position from 0 to 360 degrees.

In combination with the correct library, the magnetic flux density of a small magnet (diametral magnetisation) rotating above the IC can be measured in a non-contacting way.

Features and usage notes

• Tri⊗is® Hall Technology
• 40 bit ID number
• Single Die - SO8 or Dual Die (Full Redundant) - TSSOP16, RoHS Compliant
• Absolute Rotary Position Sensor IC
• Changeable main frequency for DSP chip (7MHz or 20 MHz master clock)
• Hysteresis Filter
• FIR and IIR filters for higher output accuracy
• Programmable Linear Transfer Characteristic
• SPI interface
• 5V Power Supply

Programming

This code initialises UART and SPI, reads data from the Magneto 2 click, and, if the readings are successful, prints it out on the UART

 1 void main() {
 2     char txt[20];
 3     uint8_t check = 0;
 4     float angle = 0.0;
 5     UART1_Init_Advanced( 9600,  _UART_8_BIT_DATA,
 6                          _UART_NOPARITY,
 7                          _UART_ONE_STOPBIT,
 8                          &_GPIO_MODULE_USART1_PA9_10 );
 9     Delay_ms(300);
10 
11     UART1_Write_Text("Uart initializedrn");
12     GPIO_Digital_Output( &GPIOD_BASE, _GPIO_PINMASK_13 ); // set CS pin as output
13 
14     // Initialize SPI
15 
16     SPI3_Init_Advanced(_SPI_FPCLK_DIV64, _SPI_MASTER   | 
17                        _SPI_8_BIT | _SPI_CLK_IDLE_LOW  | 
18                        _SPI_SECOND_CLK_EDGE_TRANSITION | 
19                        _SPI_MSB_FIRST                  | 
20                        _SPI_SS_DISABLE                 | 
21                        _SPI_SSM_ENABLE                 |  
22                        _SPI_SSI_1, &_GPIO_MODULE_SPI3_PC10_11_12);
23     SPI_Set_Active(&SPI3_Read, &SPI3_Write);      // Sets the SPI1 module active
24 
25 
26     while (1)
27     {
28         check = read_mlx();
29         if ( check == 0)                          // if read was successful, print success and angle
30         {
31             Uart1_Write_Text("Success rn");
32             angle = (float) mlx.angle;
33             angle /= 45.5;
34             floattostr(angle,txt);
35             Uart1_Write_Text(txt);
36             Uart1_Write_Text("rn");
37         }
38         else                                     // else print fail
39             Uart1_Write_Text("Fail rn");
40 
41         Delay_ms(400);                // Wait 400ms
42     }
43 }

Code example that demonstrates the usage of Magneto 2 click with MikroElektronika hardware, written for mikroC for ARM is available on Libstock.

Downloads

 Magneto 2 click Examples 

 Magneto 2 click Schematic