Arduino Starter Project 10

zoetrope.cpp

const int controlPin1 = 2;
const int controlPin2 = 3;
const int enablePin = 9;
const int directionSwitchPin = 4;
const int onOffSwitchStateSwitchPin = 5;
const int potentialPin = A0;

// create variables for recording program state
int onOffSwitchState = 0;
int previousOnOffSwitchState = 0;
int directionSwitchState = 0;
int previousDirectionSwitchState = 0;

// create variables for motor control
int motorEnabled = 0;
int motorSpeed = 0;
int motorDirection = 0;

void setup() {
    // declare digital pins as input annd outputs
    pinMode(directionSwitchPin, INPUT);
    pinMode(onOffSwitchStateSwitchPin, INPUT);
    pinMode(controlPin1, OUTPUT);
    pinMode(controlPin2, OUTPUT);
    pinMode(enablePin, OUTPUT);

    // turn motor off
    digitalWrite(enablePin, LOW);
}

void loop() {
    // read sensor information
    onOffSwitchState = digitalRead(onOffSwitchStateSwitchPin);
    delay(1);
    directionSwitchState = digitalRead(directionSwitchPin);
    motorSpeed = analogRead(potentialPin) / 4;

    // check if on/off sensor has changed and toggle motor state
    if ( onOffSwitchState != previousOnOffSwitchState ) {
        if ( onOffSwitchState == HIGH ) {
            motorEnabled = !motorEnabled;
        }
    }

    // check if direction has changed and toggle state
    if ( directionSwitchState != previousDirectionSwitchState ) {
        if ( directionSwitchState == HIGH ) {
            motorDirection = !motorDirection;
        }
    }

    // change the pins to turn the motor in the right direction
    if ( motorDirection == 1 ) {
        digitalWrite(controlPin1, HIGH);
        digitalWrite(controlPin2, LOW);
    }
    else {
        digitalWrite(controlPin1, LOW);
        digitalWrite(controlPin2, HIGH);
    }

    // PWM the motor if it is enabled
    if ( motorEnabled == 1 ) {
        analogWrite(enablePin, motorSpeed);
    }
    else {
        analogWrite(enablePin, 0);
    }

    // save the current state of the switches for next loop
    previousDirectionSwitchState = directionSwitchState;
    previousOnOffSwitchState = onOffSwitchState;
}