Mini Monster Box

#include <Servo.h>

#define RUNNING_AVG_SIZE 10
#define CLOSED_POSITION 165
#define OPEN_POSITION 90

Servo myservo;
const int servoPin = 9;
const int soundPin = A0;
float averaged_value = 0;

int pos = 0;    // variable to store the servo position

void setup() {
  Serial.begin(9600);
  myservo.attach(servoPin);  // attaches the servo on pin 9 to the servo object
  closeLid(70);
}

void loop() {
  int sensorValue = analogRead(soundPin);

  // Averaging
  float alpha = 0.1; // factor to tune
  averaged_value = alpha * sensorValue + (1-alpha) * averaged_value;
  
  Serial.print("sensor = ");
  Serial.println(sensorValue);

  Serial.print("averaged_value = ");
  Serial.println(averaged_value);

  if (averaged_value > 500) {
    
    delay(1000);

    openLid(random(1, 5));
    delay(random(50, 2000));
    closeLid(random(1, 5));
    delay(2000);

    averaged_value = 0;
  }
}

void closeLid(int speed) {
  for (int pos = 90; pos < CLOSED_POSITION; pos += speed) { // goes from 0 degrees to 180 degrees
    // Make sure we don't go above CLOSED_POSITION:
    pos = min(pos, CLOSED_POSITION);
    myservo.write(pos);              // tell servo to go to position in variable 'pos'
    delay(15);                       // waits 15ms for the servo to reach the position
  }
}

void openLid(int speed) {
  for (int pos = 165; pos > OPEN_POSITION; pos -= speed) { // goes from 180 degrees to 0 degrees
    // Make sure we don't go below OPEN_POSITION:
    pos = max(pos, OPEN_POSITION);
    myservo.write(pos);              // tell servo to go to position in variable 'pos'
    delay(15);                       // waits 15ms for the servo to reach the position
  }
}