Library Description

The library contains functions for reading the magnetic field strength in order to detect the magnetic strip. The user has the functions available for reading the linear position of the sensor on the magnetic tape, and functions that return full information about the state of the magnetic field and encoder, for example the direction of the movement , the number of steps ...

Key functions:

• int32_t magneto4_getEncoderPosition() - Encoder position.
• uint16_t magneto4_getMagneticField() - Magnetic field strength.
• void magneto4_setStartPosition(int32_t encoderPos) - Set start encoder position.

Examples description

The application is composed of the three sections :

• System Initialization - It starts the SPI module and sets the necessary gpio pins for click operation.
• Application Initialization - Initializes Driver init and sets start encoder position on the zero. Reads and logs magnetic field strength values. For starting an encoder, it is necessary that the magnetic field strength is greater than 3000.
• Application Task - Reads and logs the linear position of the sensor on the magnetic tape. When moving the sensor from left to right, one step is added and when moving from right to left, the position for 1 step is reduced.

void applicationTask()
{
    encoderPosition = magneto4_getEncoderPosition();

    if(oldPosition != encoderPosition)
    {
        IntToStr(encoderPosition, demoBuffer);
        mikrobus_logWrite(" Encoder position : ", _LOG_TEXT);
        mikrobus_logWrite(demoBuffer, _LOG_LINE);

        mikrobus_logWrite("------------------------", _LOG_LINE);
    }
    oldPosition = encoderPosition;
}

Other mikroE Libraries used in the example:

• SPI
• UART
• GPIO

Additional notes and informations

Depending on the development board you are using, you may need USB UART click, USB UART 2 click or RS232 click to connect to your PC, for development systems with no UART to USB interface available on the board. The terminal available in all MikroElektronika compilers, or any other terminal application of your choice, can be used to read the message.