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Topic: Project 10 off book Zoetrope (Read 4686 times) previous topic - next topic


I have made the programming like in the book but I get an error

void loop() {
  onOffSwitchState = digitalRead(onOffSwitchStateSwitchPin);
  directionSwitchState = digitalRead(directionSwitchPin);
  motorSpeed = analogRead(potPin)/4;

  if(onOffSwitchState ! = previousOnOffSwitchState) {  // error: expected ')' before '!" token
this is the error place   

if(onOffSwitchState == HIGH) {
      motorEnabled = !motorEnabled;

I have programmed it like in the book, so I think I make a mistake but I don't know what the mistake is.

Thank you for helping me.


Dear All,

I found the problem.

It's not ! =
but !=

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