Fading an LED with PWM and a Potentiometer

Using a potentiometer and PWM on an Arduino to fade an LED.

  2. /* POT to LED test -> by Owen Mundy March 11, 2010
  3. from: http://itp.nyu.edu/physcomp/Labs/AnalogIn
  4. —————————————————————*/
  6. int potPin = 0; // Analog input pin that the potentiometer is attached to
  7. int potValue = 0; // value read from the pot
  8. int led = 9; // PWM pin that the LED is on. n.b. PWM 0 is on digital pin 9
  10. void setup() {
  11. // initialize serial communications at 9600 bps:
  12. Serial.begin(9600);
  13. // declare the led pin as an output:
  14. pinMode(led, OUTPUT);
  15. }
  17. void loop() {
  18. potValue = analogRead(potPin); // read the pot value
  19. analogWrite(led, potValue/4); // PWM the LED with the pot value (divided by 4 to fit in a byte)
  20. Serial.println("hello"); // print the pot value back to the debugger pane
  21. delay(10); // wait 10 milliseconds before the next loop
  22. }

Here is the schematic for the above project.

potentiometer_to_led

Using PWM and a potentiometer to fade an LED and drive a stepper motor, powered by a Boarduino RBBB.

  2. /*
  3. Owen Mundy
  4. July 29, 2009
  6. p. 262 of Physical Computing
  7. Using BBB to run stepper motor by manually moving steppers
  9. */
  11. int pin1 = 3; // PWM
  12. int pin2 = 5; // PWM
  13. int pin3 = 6; // PWM
  14. int pin4 = 9; // PWM
  15. int ledpin = 13; // LED
  16. int led = false; // LED monitor
  17. int motor_time_lapse = 80;
  19. int potPin = 0; // Analog input pin that the potentiometer is attached to
  20. int potValue = 0; // value read from the pot
  21. int ledPotPin = 11; // PWM pin that the LED is on. n.b. PWM 0 is on digital pin 9
  24. void setup()
  25. {
  26. pinMode(pin1, OUTPUT); // sets the pin as output
  27. pinMode(pin2, OUTPUT); // sets the pin as output
  28. pinMode(pin3, OUTPUT); // sets the pin as output
  29. pinMode(pin4, OUTPUT); // sets the pin as output
  30. pinMode(ledpin, OUTPUT); // sets the pin as output
  32. // initialize serial communications at 9600 bps:
  33. Serial.begin(9600);
  34. // declare the led pin as an output:
  35. pinMode(ledPotPin, OUTPUT);
  36. }
  38. void loop()
  39. {
  40. potValue = analogRead(potPin); // read the pot value
  41. analogWrite(ledPotPin, potValue/4); // PWM the LED with the pot value (divided by 4 to fit in a byte)
  42. Serial.println(potValue);
  44. digitalWrite(pin1, HIGH); // on
  45. digitalWrite(pin2, LOW); // off
  46. digitalWrite(pin3, HIGH); // on
  47. digitalWrite(pin4, LOW); // off
  48. delay(motor_time_lapse); // wait
  51. digitalWrite(pin1, LOW); // off
  52. digitalWrite(pin2, HIGH); // on
  53. digitalWrite(pin3, HIGH); // on
  54. digitalWrite(pin4, LOW); // off
  55. delay(motor_time_lapse); // wait
  57. digitalWrite(pin1, LOW); // off
  58. digitalWrite(pin2, HIGH); // on
  59. digitalWrite(pin3, LOW); // off
  60. digitalWrite(pin4, HIGH); // on
  61. delay(motor_time_lapse); // wait
  64. digitalWrite(pin1, HIGH); // on
  65. digitalWrite(pin2, LOW); // off
  66. digitalWrite(pin3, LOW); // off
  67. digitalWrite(pin4, HIGH); // on
  68. delay(motor_time_lapse); // wait
  70. blink();
  71. }
  73. void blink()
  74. {
  75. if (led == false)
  76. {
  77. led = true;
  78. digitalWrite(ledpin, HIGH); // on
  79. }
  80. else
  81. {
  82. led = false;
  83. digitalWrite(ledpin, LOW); // on
  84. }
  85. }
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