MIKROE-2755

      Angle 3 click PID: MIKROE-2755       Angle 3 click carries the AK7451, a magnetic rotational angle sensor. The click is designed to run on a 5V power supply. It communicates with the target microcontroller over SPI interface, with additional functionality provided by the INT pin on the mikroBUS™ line. Angle 3 click can be used for non-contact rotation angle measurement. AK7451 features The AK7451 is a magnetic rotational angle sensor with a built-in Hall element. By detecting the magnetic field vector parallel to the IC surface, the AK7451 outputs the absolute angular position of the magnet and the relative angular position. Through the transverse magnetic field detection method, using a magnetic flux concentrator, the AK7451 has excellent axial misalignment immunity. How the click works The host microcontroller sends the request for measuring the angle rotation via the SPI interface. The AK7451 sensor responds with the measured data. There are 3 output pins on board (A, B, Z) where the IC outputs pulses for the encoder feature and the 3 output pins (U, V, W) where the IC outputs pulses for the BLDC motor drive. Specifications Type  Magnetic  Applications  Suitable to various motor drive and encoder applications  On‐board  modules  AK7451 zero latency angle sensor   Key Features  12bit angle resolution, less than ±0.6 deg. angle accuracy at 25 ºC, maximum tracking  speed : 333 rps (20,000 rpm)  Interface  SPI  Input Voltage  5V  Click board size  M (42.9 x 25.4 mm)  Pinout diagram This table shows how the pinout on Angle 3 click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns). Notes  Pin  Pin  Notes    NC 1  AN  PWM  16  NC      NC 2  RST  INT  15  INT  CS  3  CS  TX  14  NC  Interrupt    Chip select    SPI clock  SCK  4  SCK  RX  13  NC    Slave data out for SPI  SDO  5  MISO  SCL  12  NC    Slave data in for SPI  SDI  6  MOSI  SDA  11  NC    NC 7  3.3V  5V  10  +5V  Power supply  GND  8  GND  GND  9  GND  Ground    Ground  Programming Code examples for Angle 3 click, written for MikroElektronika hardware and compilers are available on Libstock. Code snippet This code demonstrates the usage of the Angle 3 click driver on an STM ARM board. After the initialization, data from the click is being read, converted, and displayed via UART, in a loop. 01 // Main function. 02 void main() 03 { 04 uint16_t angleData; // Angle data read from Angle3. 05 uint16_t angleDataDegrees; // Angle data converted to degrees. 06 uint8_t buffer[20]; // Buffer for characters to send via UART. 07 08 // Initialize the system. 09 systemInit(); 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 } // First write to UART. UART1_Write_Text("Start"); UART1_Write(13); UART1_Write(10); // Main loop. while( 1 ) { // Some delay. Delay_ms(1000); // Read angle data and convert. angleData = ANGLE3_readAngleData(); // Check the error bit. if ((angleData & _ANGLE3_ERR_BITMASK) == 0) { // Send error message via UART. UART1_Write_Text(" error"); // Continue with next loop iteration. continue; } // Convert angle data to degrees. angleData &= 0x0FFF; // Actual data is in the lower 12 bits. angleDataDegrees = ANGLE3_calculateDegrees(angleData); // Send angle data via UART. IntToStr(angleDataDegrees, buffer); UART1_Write_Text(buffer); }                                                             https://shop.mikroe.com/angle‐3‐click 9‐29‐17