pourDrink.ino

/* 
Patrick the drink pourer
  This code is for an Arduino hooked up to a servo
  that will sweep when it sees a sudden delta in its
  photoresistor.
  Photoresistor wires: A4, 10~
  Resistor A4 to Grnd
  Servo: 9~, 5V and Grnd
*/ 

#include <Servo.h> 
 
Servo myservo;  // create servo object to control a servo 
                // twelve servo objects can be created on most boards
 
int sensorPin = A4;    // select the input pin for the potentiometer
int sensorValue = 100;  // variable to store the value coming from the sensor
int oldSensorValue = 0;

int pos = 0;    // variable to store the servo position 
int minDegree = 28;
int maxDegree = 92; 
void setup()
{ 
  myservo.attach(9);  // attaches the servo on pin 9 to the servo object 
  pinMode(10, OUTPUT);
  digitalWrite(10, HIGH);
  Serial.begin(9600);
} 
 
void loop() 
{ 
  sensorValue = (2*sensorValue+analogRead(sensorPin))/3;
//  Serial.println(sensorValue-oldSensorValue);
  delay(50);
  
    Serial.println(sensorValue-oldSensorValue);
  if((sensorValue -oldSensorValue)  < -10){
    
    for(pos = maxDegree; pos>=minDegree; pos-=1)  
    {                                
      myservo.write(pos);              // tell servo to go to position in variable 'pos' 
      delay(15);                       // waits 15ms for the servo to reach the position 
    } 
    // Stay down low for the pour
    delay(800);
    for(pos = minDegree; pos <= maxDegree; pos += 1) 
    {                                  // in steps of 1 degree 
      myservo.write(pos);              // tell servo to go to position in variable 'pos' 
      delay(15);                       // waits 15ms for the servo to reach the position 
    } 
  }
  oldSensorValue = sensorValue;
}