1. Get Your Project Started with Arduino
Class 3: Arduino and Physical Computing
June 11, 2014 Don Wilcher

2. Arduino and Physical Computing
Topics
What is Physical Computing?
Make: Basic Arduino Book example
Let’s Make a Tilt Sensing Servo Motor Controller!

3. What is Physical Computing?
Definitions
“The interaction between a human, an electronic circuit, and a sensor is physical computing.” [1]
“Physical computing is about creating a conversation between the physical world and virtual world of the computer.” [2]

4. What is Physical Computing?...
References [1] Learn Electronics with Arduino, Wilcher, D., Apress, 2012 [2] Physical Computing, Sullivan, D, and Igoe, T., Thomson Course Technology, 2004

5. Make:Basic Arduino book example

6. Let’s Build a Tilt Sensing Motor Controller
Chapter 3. Tilt Sensing Servo Motor Controller In this chapter, we’ll build a gadget to easily detect object orientation using a tilt control switch to control a servo motor.

7. Tilt Sensing Motor Controller Block Diagram

8. Tilt Sensing Motor Controller Prototype

9. Tilt Sensing Motor Controller BOM
Parts List
Arduino microcontroller
SW1: tilt control switch
JI: servo motor
R1: 1K ohm resistor (brown, black, red stripes)
Pair of alligator test leads or equivalent
Full-size clear breadboard

10. Tilt Sensing Motor Controller Fritzing Wiring Diagram

11. Tilt Sensing Motor Controller Circuit Schematic Diagram

12. Tilt Sensing Motor Controller Sketch
/* This sketch controls a servo motor using a tilt control switch! *
* 12 December 2012
* by Don Wilcher */
#include<Servo.h> // include Servo library
int inPin = 2; // the tilt control switch is wired to Arduino D2 pin
int reading; // the current reading from the input pin
Servo myservo; // create servo motor object
void setup() {
myservo.attach(9); // attach servo motor to pin 9 of Arduino
pinMode(inPin, INPUT); // make pin 2 an input }
void loop()
reading = digitalRead(inPin); // store digital data in variable
if(reading == HIGH) { // check digital data with target value
myservo.write(180); // if digital data equals target value,
// servo motor rotates 180 degrees
delay(15); // wait 15ms for rotation
else { // if reading is not equal to target value,
myservo.write(0); // rotate servo motor to 0 degrees
delay(15); // wait 15ms for rotation