Wheres my voltage? (what am I doing wrong?)

Projects General Guidance
19

Add this or somthing very like it to your code

// add the following
unsigned long motorStart = 0;
boolean motorOn = false;
int motorRuntime = 200;// length of time to run motor in millis

void doMotor(){
  // motor control stuff
  int curTime = 0;
  if (motorOn){
    curTime = millis();
    if (curTime-motorStart>motorRuntime){
      motorOn = false;
      digitalWrite(motorPin, LOW);
  }
}

void startMotor(){
    digitalWrite(motorPin, HIGH);
    motorStart = millis();
    motorOn = true;
}

replace your "digitalWrite(motorPin, HIGH);" calls to startMotor();

and at the start of loop add a call to doMotor();

This should do the job.

Mark