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Building your own Lightsaber

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me me me Pete Hodgson Consultant at ThoughtWorks @ph1 blog.thepete.net

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TSA Pro-Tip™

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Green Field http://www.flickr.com/photos/jillclardy/3213748255

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Continuous Integration

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Feedback

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Feedback

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http://www.flickr.com/photos/johnmueller/52621490/ what if you have
 no build box?

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Raspberry Pi

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Raspberry Pi

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visual indicator aka build light

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Build
 Light

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Pretending to work

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raspberry pi & build light

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done.

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done. ?

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build light build my own lightsaber

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Learning by Doing

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Learning Doing

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Learning Doing Learning By Doing

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Choose a “right-sized“ problem

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build light build my own lightsaber

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LEDs low voltage (can be powered via USB) bright flexible (blinky! colors!)

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all the colors

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The Drefus Model

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Beginner Expert

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Beginner detailed step-by-step instructions no wider context

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Beginner detailed step-by-step instructions no wider context Expert wider context (goal) no details (yet)

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Know where you are on the Drefus scale

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all the colors

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multi-color LEDs Search

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multi-color LEDs Search an LED can only be one color… but LEDs can come in many colors… solution: combine different colored LEDs

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RGB
 color mixing

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vary LED brightness Search

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vary LED brightness Pulse Width Modulation P W M Search

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Incandescent Bulb Voltage Brightness

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LED Voltage Brightness

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voltage 100% 0% time brightness: 100%

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voltage 100% 0% time

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50%
 on 50%
 off duty cycle voltage 100% 0% time

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50%
 on 50%
 off duty cycle brightness: 50% voltage 100% 0% time

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voltage 100% 0% time

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25% on 75% off voltage 100% 0% time

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brightness: 25% 25% on 75% off voltage 100% 0% time

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Don't trust your intuition '

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Red LED + Green LED + Blue LED + PWM = all the colors!

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Raspberry PI red LED green LED blue LED PWM

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GPIO Pins

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Raspberry Pi has two GPIO pins which capable of PWM output. Our light needs three.

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Arduino

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Arduino is an Open-Source electronics prototyping platform based on flexible, easy-to-use hardware and software. - arduino.cc

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Arduino

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Raspberry PI red LED green LED blue LED PWM

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Raspberry PI red LED green LED blue LED PWM Arduino ???

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Feature-creep as a learning tool

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Raspberry PI red LED green LED blue LED PWM Arduino ???

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baby steps, towards an eventual goal.

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sketch 1 blinking an LED (Hello World of hardware)

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IO pin ground pin

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pin “high” (+ve voltage)

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pin “low” (0 voltage)

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int LED_PIN = 6;! ! void setup() { ! pinMode(LED_PIN, OUTPUT); ! }! ! void loop() {! digitalWrite(LED_PIN, HIGH);! delay(1000); ! digitalWrite(LED_PIN, LOW);! delay(1000); ! }!

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sketch 2 fading an LED (PWM)

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int LED_PIN = 6;! int MAX_BRIGHTNESS = 255;! int brightness = 0;! ! void setup() { ! pinMode(LED_PIN, OUTPUT); ! }! ! void loop() {! analogWrite(LED_PIN, brightness);! ! brightness = brightness + 5;! if( brightness > MAX_BRIGHTNESS )! brightness = 0;! ! delay(30);! }!

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int LED_PIN = 6;! int MAX_BRIGHTNESS = 255;! int brightness = 0;! ! void setup() { ! pinMode(LED_PIN, OUTPUT); ! }! ! void loop() {! analogWrite(LED_PIN, brightness);! ! brightness = brightness + 5;! if( brightness > MAX_BRIGHTNESS )! brightness = 0;! ! delay(30);! }! PWM

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sketch 3 mixing colors

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int RED_PIN = 3;! int GREEN_PIN = 5;! int BLUE_PIN = 6;! int MAX_BRIGHTNESS = 255;! ! void setup() { ! pinMode(RED_PIN, OUTPUT );! pinMode(GREEN_PIN, OUTPUT );! pinMode(BLUE_PIN, OUTPUT );! }! ! void loop() {! byte color[3];! assignRandomColorTo(color);! displayColor(color);! delay(1000); ! }! ! void assignRandomColorTo(byte colorComponents[]){! colorComponents[0] = random(MAX_BRIGHTNESS);!

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int RED_PIN = 3;! int GREEN_PIN = 5;! int BLUE_PIN = 6;! int MAX_BRIGHTNESS = 255;! ! void setup() { ! pinMode(RED_PIN, OUTPUT );! pinMode(GREEN_PIN, OUTPUT );! pinMode(BLUE_PIN, OUTPUT );! }! ! void loop() {! byte color[3];! assignRandomColorTo(color);! displayColor(color);! delay(1000); ! }! ! void assignRandomColorTo(byte colorComponents[]){! colorComponents[0] = random(MAX_BRIGHTNESS);!

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int RED_PIN = 3;! int GREEN_PIN = 5;! int BLUE_PIN = 6;! int MAX_BRIGHTNESS = 255;! ! void setup() { ! pinMode(RED_PIN, OUTPUT );! pinMode(GREEN_PIN, OUTPUT );! pinMode(BLUE_PIN, OUTPUT );! }! ! void loop() {! byte color[3];! assignRandomColorTo(color);! displayColor(color);! delay(1000); ! }! ! void assignRandomColorTo(byte colorComponents[]){! colorComponents[0] = random(MAX_BRIGHTNESS);!

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! void loop() {! byte color[3];! assignRandomColorTo(color);! displayColor(color);! delay(1000); ! }! ! void assignRandomColorTo(byte colorComponents[]){! colorComponents[0] = random(MAX_BRIGHTNESS);! colorComponents[1] = random(MAX_BRIGHTNESS);! colorComponents[2] = random(MAX_BRIGHTNESS);! }! ! void displayColor(byte colorComponents[]){! analogWrite( RED_PIN, colorComponents[0] );! analogWrite( GREEN_PIN, colorComponents[1] );! analogWrite( BLUE_PIN, colorComponents[2] ); ! }!

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! void loop() {! byte color[3];! assignRandomColorTo(color);! displayColor(color);! delay(1000); ! }! ! void assignRandomColorTo(byte colorComponents[]){! colorComponents[0] = random(MAX_BRIGHTNESS);! colorComponents[1] = random(MAX_BRIGHTNESS);! colorComponents[2] = random(MAX_BRIGHTNESS);! }! ! void displayColor(byte colorComponents[]){! analogWrite( RED_PIN, colorComponents[0] );! analogWrite( GREEN_PIN, colorComponents[1] );! analogWrite( BLUE_PIN, colorComponents[2] ); ! }!

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! void loop() {! byte color[3];! assignRandomColorTo(color);! displayColor(color);! delay(1000); ! }! ! void assignRandomColorTo(byte colorComponents[]){! colorComponents[0] = random(MAX_BRIGHTNESS);! colorComponents[1] = random(MAX_BRIGHTNESS);! colorComponents[2] = random(MAX_BRIGHTNESS);! }! ! void displayColor(byte colorComponents[]){! analogWrite( RED_PIN, colorComponents[0] );! analogWrite( GREEN_PIN, colorComponents[1] );! analogWrite( BLUE_PIN, colorComponents[2] ); ! }!

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! void loop() {! byte color[3];! assignRandomColorTo(color);! displayColor(color);! delay(1000); ! }! ! void assignRandomColorTo(byte colorComponents[]){! colorComponents[0] = random(MAX_BRIGHTNESS);! colorComponents[1] = random(MAX_BRIGHTNESS);! colorComponents[2] = random(MAX_BRIGHTNESS);! }! ! void displayColor(byte colorComponents[]){! analogWrite( RED_PIN, colorComponents[0] );! analogWrite( GREEN_PIN, colorComponents[1] );! analogWrite( BLUE_PIN, colorComponents[2] ); ! }!

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Raspberry PI red LED green LED blue LED PWM Arduino ???

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Raspberry PI red LED green LED blue LED PWM Arduino ???

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Raspberry PI red LED green LED blue LED PWM Arduino serial

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sketch 4 an echo server (serial IO)

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void setup()! {! Serial.begin(57600); // start serial port at 57600 bps! }! ! void loop() {! waitForInput();! ! static char input[1025];! int bytesRead = Serial.readBytesUntil( '\n', input, 1024 );! ! if( bytesRead ){! String str = String(input);! str.toUpperCase();! Serial.println(str);! }! }! ! void waitForInput() {! while (Serial.available() <= 0) {! // busy loop! }! }!

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void setup()! {! Serial.begin(57600); // start serial port at 57600 bps! }! ! void loop() {! waitForInput();! ! static char input[1025];! int bytesRead = Serial.readBytesUntil( '\n', input, 1024 );! ! if( bytesRead ){! String str = String(input);! str.toUpperCase();! Serial.println(str);! }! }! ! void waitForInput() {! while (Serial.available() <= 0) {! // busy loop! }! }!

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void setup()! {! Serial.begin(57600); // start serial port at 57600 bps! }! ! void loop() {! waitForInput();! ! static char input[1025];! int bytesRead = Serial.readBytesUntil( '\n', input, 1024 );! ! if( bytesRead ){! String str = String(input);! str.toUpperCase();! Serial.println(str);! }! }! ! void waitForInput() {! while (Serial.available() <= 0) {! // busy loop! }! }!

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void setup()! {! Serial.begin(57600); // start serial port at 57600 bps! }! ! void loop() {! waitForInput();! ! static char input[1025];! int bytesRead = Serial.readBytesUntil( '\n', input, 1024 );! ! if( bytesRead ){! String str = String(input);! str.toUpperCase();! Serial.println(str);! }! }! ! void waitForInput() {! while (Serial.available() <= 0) {! // busy loop! }! }!

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void setup()! {! Serial.begin(57600); // start serial port at 57600 bps! }! ! void loop() {! waitForInput();! ! static char input[1025];! int bytesRead = Serial.readBytesUntil( '\n', input, 1024 );! ! if( bytesRead ){! String str = String(input);! str.toUpperCase();! Serial.println(str);! }! }! ! void waitForInput() {! while (Serial.available() <= 0) {! // busy loop! }! }!

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void setup()! {! Serial.begin(57600); // start serial port at 57600 bps! }! ! void loop() {! waitForInput();! ! static char input[1025];! int bytesRead = Serial.readBytesUntil( '\n', input, 1024 );! ! if( bytesRead ){! String str = String(input);! str.toUpperCase();! Serial.println(str);! }! }! ! void waitForInput() {! while (Serial.available() <= 0) {! // busy loop! }! }!

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Raspberry PI red LED green LED blue LED PWM Arduino serial

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GPIO Pins

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Raspberry PI red LED green LED blue LED Arduino

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Raspberry PI red LED green LED blue LED Arduino “ffaa11\n”

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Raspberry PI red LED green LED blue LED Arduino “ffaa11\n”

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Raspberry PI red LED green LED blue LED Arduino “ffaa11\n”

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Much Learning Arduino- compatibles bareduinos LPC810 soldering! transistors protoboard fritzing voltage regulators node.js cctray line-level converters command-line builds C++ on Arduino usb to serial external programmers OSS hardware

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Resources

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Resources

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moredip/aphex (work in progress)

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Have FUN!

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Pete Hodgson @ph1 [email protected] these slides http://bit.ly/buildlightsaber