Vaults Project Arduino Code

vault.ino

int lastReading = 0;
int threshold = 18;
int hittingThres = 0;
int SECONDS_THRESHOLD = 60;

void calibrate() { // sets threshold
  int readings = 0;
  int NUM_CALIBRATE = 5;
  for(int i = 0; i < NUM_CALIBRATE; i++) {
    if(i % 2 == 1) digitalWrite(12, HIGH);
    else digitalWrite(12, LOW);
    readings += analogRead(0);
    delay(1000);
  }
  digitalWrite(12, LOW);
  threshold = 2 + readings / NUM_CALIBRATE;
}

void setup() {
  Serial.begin(9600);
  pinMode(13, INPUT); // on-off switch
  pinMode(0, INPUT); // sensor
  pinMode(12, OUTPUT); // LED
  Serial.println("All set");
  digitalWrite(12, HIGH);
  calibrate();
}

void loop() {
  // put your main code here, to run repeatedly:
  if(!digitalRead(13)) {
    //Serial.println("yes");
  } else {
    //Serial.println("no");
    //return;
  }
  int reading = analogRead(0);
  if(lastReading == 0) lastReading = reading;
  int normalizedReading = (lastReading + reading)/2;
  Serial.println(normalizedReading);
  lastReading = normalizedReading;
  Serial.print(" ");
  if(normalizedReading >= threshold) hittingThres++;
  else hittingThres--;
  if(hittingThres >= SECONDS_THRESHOLD) digitalWrite(12, HIGH);
  else digitalWrite(12, LOW);
  delay(50);
}