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Wed, 10/19/2011 - 06:54 — alex_gaysinsky

VIDEO

http://www.youtube.com/watch?v=Ge4Li4cHBdo

CODE
 
/*
 * Servo with Potentiometer control
 * Theory and Practice of Tangible User Interfaces
 * October 18 2011
 */
 
int servoPin = 7;      // Control pin for servo motor
int potPin   = 0;      // select the input pin for the potentiometer
 
int pulseWidth = 0;    // Amount to pulse the servo
long lastPulse = 0;    // the time in millisecs of the last pulse
int refreshTime = 20;  // the time in millisecs needed in between pulses
int val;               // variable used to store data from potentiometer
 
int minPulse = 1100;   // minimum pulse width
int maxPulse = 2300;   // minimum pulse width
 
int step = 5;
 
void setup() {
  pinMode(servoPin, OUTPUT);  // Set servo pin as an output pin
  pulseWidth = minPulse;      // Set the motor position to the minimum
  Serial.begin(9600);         // connect to the serial port
  Serial.println("servo_serial_better ready");
}
 
void loop() {
  val = analogRead(potPin);    // read the value from the sensor, between 0 - 1024
  
  if (val > 10 && val <= 1024 ) {
    
    
    int incr = float(step) * (1+float(val) / 512.);
    Serial.println(incr);
    
    pulseWidth += incr;
    if (pulseWidth > maxPulse) {
      step = -step;  // change direction;
      pulseWidth = maxPulse;
    } 
 
    if (pulseWidth < minPulse) {
      step = -step;  // change direction;
      pulseWidth = minPulse;
    } 
      
  }
  updateServo();   // update servo position
}
 
// called every loop(). 
void updateServo() {
  // pulse the servo again if the refresh time (20 ms) has passed:
  if (millis() - lastPulse >= refreshTime) {
    digitalWrite(servoPin, HIGH);   // Turn the motor on
    delayMicroseconds(pulseWidth);  // Length of the pulse sets the motor position
    digitalWrite(servoPin, LOW);    // Turn the motor off
    lastPulse = millis();           // save the time of the last pulse
  }
}
 
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