Description
In this lab we experimented with simple mechanics and translating the rotational motion of the servo motor into linear motion. Our task was to build a 'cuckoo' house that had a bird being propelled through a trap door that also opens with rotational motion. To do this we put together a construction to push the bird forward as well as attaching a door to another servo motor. We then wired both servo motors into the same Arduino, altered the code, and controlled both motions with one potentiometer.
Components Used
1 – Arduino Uno
1 – Breadboard
2 – Servo
Wooden Sticks
plastic pillars
Tape
Code
/*
* Servo with Potentiometer control
* Theory and Practice of Tangible User Interfaces
* October 11 2007
*/
int servoPin = 7; // Control pin for servo motor
int servoPin1 = 6; // 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 = 500; // minimum pulse width
void setup() {
pinMode(servoPin, OUTPUT); // Set servo pin as an output pin
pinMode(servoPin1, 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 > 0 && val <= 999 ) {
pulseWidth = val*2 + minPulse; // convert angle to microseconds
Serial.print("moving servo to ");
Serial.println(pulseWidth,DEC);
}
updateServo(); // update servo position
updateServo1(); // 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
digitalWrite(servoPin1, HIGH); // Turn the motor on
delayMicroseconds(pulseWidth); // Length of the pulse sets the motor position
digitalWrite(servoPin, LOW); // Turn the motor off
digitalWrite(servoPin1, LOW); // Turn the motor off
lastPulse = millis(); // save the time of the last pulse
}
}
Link to Video
- Login to post comments
