PIC - Toggle an LED using a Hall Effect Sensor

29.12.24

Embedded

Here's a little C program for a PIC microcontroller that toggles an LED based on input from a hall effect sensor:

#include < xc.h >

#define _XTAL_FREQ 8000000  // Set your oscillator frequency

// Configuration settings
#pragma config FOSC = HS     // Oscillator Selection bits (HS oscillator)
#pragma config WDTE = OFF    // Watchdog Timer Enable bit (WDT disabled)
#pragma config PWRTE = OFF   // Power-up Timer Enable bit (PWRT disabled)
#pragma config BOREN = OFF   // Brown-out Reset Enable bit (BOR disabled)
#pragma config LVP = OFF     // Low-Voltage Programming Enable bit (RB3/PGM pin has digital I/O function; HV on MCLR must be used for programming)

#define HALL_SENSOR RB0    // Hall effect sensor connected to RB0 pin
#define LED RB1            // LED connected to RB1 pin

void main() {
    TRISB0 = 1;  // Set RB0 pin as input (Hall effect sensor)
    TRISB1 = 0;  // Set RB1 pin as output (LED)

    while(1) {
        if (HALL_SENSOR == 1) {  // If the sensor detects a magnetic field
            LED = !LED;          // Toggle the LED
            __delay_ms(100);     // Delay for debouncing
        }
    }
}

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