ShotDeliverSystem_Dispensary_Main.c

// A demonstration of this project can be found here: https://bit.ly/2Ynx09x

/*
    Parts used to make the dispensary:
    [1] PIC18F4520
    [1] 12-24v DC water pump motor
    [1] 30 mA LED
    [1] relay module
    [1] 5v power supply
    [1] 330 ohm resistor
    [1] amazon box (12 inch by 24 inch)
    [1] fly-back diode
    [2] obstacle avoidance sensors
    [20+] jumper wires
    [16] AA batteries
    [5] 10k resistors
*/

#include <xc.h>
#include <pic18f4520.h>
#include "ShotDelivSystemConfigbits.h"

#define MOTOR LATEbits.LE2

const char ON = 1;
const char OFF = 0;

char picIsOn = 0;

void __interrupt() HIGH_ISR(void);

void bitSetupLED(void);
void bitSetupObstacleAvoidanceSensors(void);
void bitSetupOscillator(void);
void bitSetupInterrupt(void);
void bitSetupMotor(void);

void handleMotor(char);

void main(void)
{
    bitSetupLED();
    bitSetupObstacleAvoidanceSensors();
    bitSetupOscillator();
    bitSetupInterrupt();
    bitSetupMotor();

    while(1)
    {
        if(picIsOn == 1)
        {
            if(PORTBbits.RB0 == 0)
            {
                handleMotor(ON);
            }
            else
            {
                handleMotor(OFF);
            }
            LATDbits.LD1 = 1;
            if(PORTBbits.RB2 == 1) //If the system does not detect a car, then it will go into sleep mode.
            {
                handleMotor(OFF);
                LATDbits.LD1 = 0;
                picIsOn = 0;
                Sleep();
            }
        }
    }

    return;
}

void __interrupt() HIGH_ISR()
{
    INTCONbits.GIEH = 0;

    if(INTCON3bits.INT2IF)
    {
        picIsOn = 1;
        __delay_ms(30); //this delay prevents a glitch that
                        //happens when the car is barely in range.
        INTCON3bits.INT2IF = 0;
    }

    INTCONbits.GIEH = 1;
}

void bitSetupLED()
{
    TRISDbits.RD1 = 0;
    LATDbits.LD1 = 0;
}

void bitSetupObstacleAvoidanceSensors()
{
    TRISBbits.RB0 = 1;
    TRISBbits.RB2 = 1;
}

void bitSetupOscillator()
{
    OSCCONbits.IDLEN = 0; //this allows the PIC to enter sleep mode after
                          //the sleep function is called
    OSCCONbits.OSTS = 1;
    OSCCONbits.IRCF = 0b111;
    OSCCONbits.SCS = 0b10;
    while(OSCCONbits.IOFS != 1);
}

void bitSetupInterrupt()
{

    RCONbits.IPEN = 1;

    INTCON3bits.INT2IE = 1;
    INTCON3bits.INT2IP = 1;
    INTCON2bits.INTEDG2 = 1;

    INTCONbits.GIEH = 1;
}

void bitSetupMotor()
{
    TRISEbits.RE2 = 0;
    MOTOR = 0;
}

void handleMotor(char motorState)
{
    if(motorState == 1)
    {
        MOTOR = 1;
    }
    else
    {
        MOTOR = 0;
    }
}