/*
ECEN2830 motor speed control example (left wheel only)
*/

// define pins
const int pinON = 6;         // connect pin 6 to ON/OFF switch, active HIGH
const int pinCW_Left = 7;    // connect pin 7 to clock-wise PMOS gate
const int pinCC_Left = 8;    // connect pin 8 to counter-clock-wise PMOS gate
const int pinSpeed_Left = 9; // connect pin 9 to speed reference

// setup pins and initial values
void setup() {
  pinMode(pinON,INPUT);
  pinMode(pinCW_Left,OUTPUT);
  pinMode(pinCC_Left,OUTPUT);
  pinMode(pinSpeed_Left,OUTPUT);
  pinMode(13,OUTPUT);             // on-board LED
  digitalWrite(pinCW_Left,LOW);   // stop clockwise
  digitalWrite(pinCC_Left,LOW);   // stop counter-clockwise
  analogWrite(pinSpeed_Left,100); // set speed reference, duty-cycle = 100/255
}

void loop() {
  digitalWrite(13,LOW);                     // turn LED off
  do {} while (digitalRead(pinON) == LOW);  // wait for ON switch
  digitalWrite(13,HIGH);                    // turn LED on
  delay(1000);                              // wait 1 second
  digitalWrite(pinCW_Left,HIGH);            // go clockwise
  delay(3000);                              // for 3 seconds
  digitalWrite(pinCW_Left,LOW);             // stop
}