Building Your Own Lightsaber

Pete Hodgson

January 03, 2014

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Transcript

1. Building your own Lightsaber

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

3. TSA Pro-Tip™

4. None
5. None

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

7. Continuous Integration

8. Feedback

9. None

10. Feedback

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

12. None

13. Raspberry Pi

14. None

15. Raspberry Pi

16. visual indicator aka build light

17. None
18. None

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

37. None

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!
55. None

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

    ???
66. None

67. baby steps, towards an eventual goal.

68. sketch 1 blinking an LED (Hello World of hardware)

69. None

70. IO pin ground pin

71. None

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)

76. None

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

80. None
81. None
82. None

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[email protected] these slides http://bit.ly/buildlightsaber