Interfacing TCRT5000 IR Emitter/Detector Pair with TM4C
In this example, we going to have TCRT5000 IR Emitter/Detector pair as an input , an LED and a DC motor as outputs. The way the code works is, if a an object is placed within the sensing range of the IR sensor, the LED turns on and the DC motor starts to rotate. This pieced of code is part of a bigger code written to control a line following robot. We shall discuss how to build and program this robot in future lessons.
Program
//Digital sensor
//Author :cortex-m.com
//Function: Interfacing TCRT5000 IR module as a digital sensor
#include "TM4C123.h" // Device header
#include <stdint.h>
#define DETECTOR (1U<<4)
#define LED_BLUE (1U<<2)
#define MOTOR (1U<<6) unint_32 state=0; void Port_init(void); int main(void) { Port_init(); while(1){ if((GPIOA -> DATA & DETECTOR)==DETECTOR)
{
state = 0;
GPIOF ->DATA &= ~LED_BLUE;
GPIOA ->DATA &= ~MOTOR;
}
else
{
state =1;
GPIOF -> DATA |=LED_BLUE;
GPIOA -> DATA |=MOTOR ;
}
}
}
void Port_init(void)
{
SYSCTL->RCGCGPIO |=(1U<<0)|(1U<<5); GPIOF ->DIR |=LED_BLUE;
GPIOF ->DEN |=LED_BLUE;
GPIOA ->DR8R |=MOTOR;
GPIOA ->DIR |=MOTOR;
GPIOA -> DEN |=DETECTOR|MOTOR ;
}