Digital Lecture Assignment 6

Video:

My Code:

int ledPins[4] = {29, 30, 31, 32};   // LED array
int toggle = 34;
int tempo = 0;
int currentStep = 0;                 //"counter" variable
unsigned long lastStepTime = 0;      

void setup() {
  for (int i = 0; i < 4; i++) {      //for loop to set up all LEDs
    pinMode(ledPins[i], OUTPUT);
  }
  pinMode(toggle, INPUT);
}

void loop() {
  tempo = analogRead(A14); //setup tempo analog input
  if (digitalRead(toggle) == HIGH) {
    stepForwards();
  }else {
    stepBackwards();
  }
}

void stepForwards() {  
  if (millis() >= lastStepTime + tempo) {           //run the function with millis() instead of delay
    if (currentStep == 0) {                         //LED off
      digitalWrite(ledPins[3], LOW);
    }else {
      digitalWrite(ledPins[currentStep - 1], LOW);
    }
    
    lastStepTime = millis();
    digitalWrite(ledPins[currentStep], HIGH);
    currentStep++;                                  //increase "counter"
    
    if (currentStep == 4) {
      currentStep = 0;                              //reset "counter"
    }
  }
}

void stepBackwards() {  
  if (millis() >= lastStepTime + tempo) {          
    if (currentStep == 3) {                         
      digitalWrite(ledPins[0], LOW);
    }else {
      digitalWrite(ledPins[currentStep + 1], LOW);
    }
    
    lastStepTime = millis();
    digitalWrite(ledPins[currentStep], HIGH);
  
    if (currentStep == 0) {
      currentStep = 3;                              
    }else {
      currentStep--;                                
    }
  }
}