// declare and initialize pins
const int ledstripPin =  0;// the number of the LED strip pin
const int dirPin = 1; // direction
const int stepPin = 2; // step
const int enaPin = 3; // enable
const int cameraPin = 8; // camera (same as UPDI)
const int hallPin = 11; // hall sensor pin

String msg;
float brightness;
int brightness_analog;
float angle;

// the setup function runs once when you press reset or power the board
void setup() {
  // initialize pins as outputs
  pinMode(ledstripPin, OUTPUT);
  pinMode(stepPin,OUTPUT);
  pinMode(dirPin,OUTPUT);
  pinMode(enaPin,OUTPUT);
  pinMode(cameraPin,OUTPUT);

  digitalWrite(cameraPin,LOW); // Stop recording
  
  pinMode(hallPin,INPUT);

  analogWrite(ledstripPin, 0);
  digitalWrite(dirPin,LOW); // Set the rotation to one particular direction
  digitalWrite(enaPin,LOW); // Enable the motor to rotate
  
  Serial.begin(115200); // Start serial communication
  while (!Serial); // Wait until Serial is open
  Serial.println('listening...'); // Send that Serial is open and listening
}

// the loop function runs over and over again forever
void loop() {
  while (Serial.available()) {
    delay(3);  //delay to allow buffer to fill 
    if (Serial.available() > 0) {
      char c = Serial.read();  //gets one byte from serial buffer
      msg += c; //makes the string readString
    } 
  }
  if (msg != ""){
    if (msg.startsWith("Step")){
      // Perform a step by generating a single pulse
      digitalWrite(stepPin,HIGH);
      delayMicroseconds(200);
      digitalWrite(stepPin,LOW);
      delayMicroseconds(200);
      angle = 0.0;
      for (int i = 0; i < 5; i++){
        angle = angle + (float) analogRead(hallPin);
      }
      Serial.println(angle/5);
    }
    else{
      Serial.println("Echo: " + msg);
      if (msg.startsWith("B")){
        brightness = msg.substring(1).toFloat();
        Serial.println(brightness);
        brightness_analog = (int)((255.0*brightness/100.0)+0.5);
        Serial.println(brightness_analog);
        analogWrite(ledstripPin, brightness_analog);
      }
      else if (msg.startsWith("START")){
        digitalWrite(cameraPin,HIGH); // Start recording
      }
      else if (msg.startsWith("STOP")){
        analogWrite(ledstripPin, 0); // Set brightness to zero
        digitalWrite(cameraPin,LOW); // Stop recording
      }
    }
    msg = "";
  }
}