Assignment: Servo Motor: Actuation Assignment 2

Collaborators:

(Apologies for submitting a late assignment. I was out of town for a conference.)

Here I used the servo motor to power a paper "pop-up" that features a basketball player, who moves upward to make a slam dunk. The servo motor attaches to a paper cut-out of the basketball player by a couple toothpicks and paper backing. Rotating the pot rotates the servo, which then moves the figure up or down.

Attached are two photos, one of the basketball player facade and the other of the facade, servo motor, and pot controller. Below is a short video demonstrating the "slam dunk":

Below is the code that I did not alter though:

/*
* Servo with Potentiometer control
* Theory and Practice of Tangible User Interfaces
* October 11 2007
*/

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 = 500;   // minimum pulse width

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 > 0 && val <= 999 ) {
pulseWidth = val*2 + minPulse;  // convert angle to microseconds

Serial.print("moving servo to ");
Serial.println(pulseWidth,DEC);

}
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
}
}