Building Your Own Lightsaber

Presented at CodeMash 2014

Transcript

1. Building your own Lightsaber
2. me me me Pete Hodgson Consultant at ThoughtWorks @ph1 blog.thepete.net
3. TSA Pro-Tip™
6. Green Field http://www.flickr.com/photos/jillclardy/3213748255
7. Continuous Integration
8. Feedback
10. Feedback
11. http://www.flickr.com/photos/johnmueller/52621490/ what if you have
 no build box?
13. Raspberry Pi
15. Raspberry Pi
16. visual indicator aka build light
19. Build
 Light
20. Pretending to work
21. raspberry pi & build light
22. done.
23. done. ?
24. build light build my own lightsaber
25. Learning by Doing
26. Learning Doing
27. Learning Doing Learning By Doing
28. Choose a “right-sized“ problem
29. build light build my own lightsaber
30. LEDs low voltage (can be powered via USB) bright flexible (blinky! colors!)
31. all the colors
32. The Drefus Model
33. Beginner Expert
34. Beginner detailed step-by-step instructions no wider context
35. Beginner detailed step-by-step instructions no wider context Expert wider context (goal) no details (yet)
36. Know where you are on the Drefus scale
38. all the colors
39. multi-color LEDs Search
40. multi-color LEDs Search an LED can only be one color… but LEDs can come in many colors… solution: combine different colored LEDs
41. RGB
 color mixing
42. vary LED brightness Search
43. vary LED brightness Pulse Width Modulation P W M Search
44. Incandescent Bulb Voltage Brightness
45. LED Voltage Brightness
46. voltage 100% 0% time brightness: 100%
47. voltage 100% 0% time
48. 50%
 on 50%
 off duty cycle voltage 100% 0% time
49. 50%
 on 50%
 off duty cycle brightness: 50% voltage 100% 0% time
50. voltage 100% 0% time
51. 25% on 75% off voltage 100% 0% time
52. brightness: 25% 25% on 75% off voltage 100% 0% time
53. Don't trust your intuition '
54. Red LED + Green LED + Blue LED + PWM = all the colors!
56. Raspberry PI red LED green LED blue LED PWM
57. GPIO Pins
58. Raspberry Pi has two GPIO pins which capable of PWM output. Our light needs three.
59. Arduino
60. Arduino is an Open-Source electronics prototyping platform based on flexible, easy-to-use hardware and software. - arduino.cc
61. Arduino
62. Raspberry PI red LED green LED blue LED PWM
63. Raspberry PI red LED green LED blue LED PWM Arduino ???
64. Feature-creep as a learning tool
65. Raspberry PI red LED green LED blue LED PWM Arduino ???
67. baby steps, towards an eventual goal.
68. sketch 1 blinking an LED (Hello World of hardware)
70. IO pin ground pin
72. pin “high” (+ve voltage)
73. pin “low” (0 voltage)
74. int LED_PIN = 6;! ! void setup() { ! pinMode(LED_PIN, OUTPUT); ! }! ! void loop() {! digitalWrite(LED_PIN, HIGH);! delay(1000); ! digitalWrite(LED_PIN, LOW);! delay(1000); ! }!
75. sketch 2 fading an LED (PWM)
77. 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);! }!
78. 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
79. sketch 3 mixing colors
83. 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);!
84. 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);!
85. 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);!
86. ! 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] ); ! }!
87. ! 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] ); ! }!
88. ! 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] ); ! }!
89. ! 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] ); ! }!
90. Raspberry PI red LED green LED blue LED PWM Arduino ???
91. Raspberry PI red LED green LED blue LED PWM Arduino ???
92. Raspberry PI red LED green LED blue LED PWM Arduino serial
93. sketch 4 an echo server (serial IO)
94. 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! }! }!
95. 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! }! }!
96. 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! }! }!
97. 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! }! }!
98. 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! }! }!
99. 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! }! }!
100. Raspberry PI red LED green LED blue LED PWM Arduino serial
101. GPIO Pins
102. Raspberry PI red LED green LED blue LED Arduino
103. Raspberry PI red LED green LED blue LED Arduino “ffaa11\n”
104. Raspberry PI red LED green LED blue LED Arduino “ffaa11\n”
105. Raspberry PI red LED green LED blue LED Arduino “ffaa11\n”
106. 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
107. Resources
108. Resources
109. moredip/aphex (work in progress)
110. Have FUN!
111. Pete Hodgson @ph1 phodgson@thoughtworks.com these slides http://bit.ly/buildlightsaber