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Arduino-controlled, LED-powered Halloween Pumpkin
Java
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README.md
circuit_diagram.jpg
guts.jpg
pumpkin.jpg
pumpkin.pde

README.md

Pumpkin

A carved pumpkin with a high-powered LED that I made for Halloween 2011.

The pumpkin

Video of pumpkin in action

Building

I built out the project in this order:

  1. Build constant-current circuit on a breadboard to power one LED channel
  2. Adapted the circuit to use the Arduino
  3. Wrote a bit of code to test out PWM
  4. Soldered the three drivers
  5. Hooked everything up to the Arduino & tested (put the three drivers in parallel)
  6. Coded up the light show

Diagram

The circuit diagram

(Credit: Dan Goldwater, High Power LED Driver Circuits)

Parts

  • 1x Arduino Duemilanove
  • 3x 1W 100kΩ resistors (R1)
  • 3x 1W 1.5Ω resistors (R3)
  • 1x High-power 3W RGB LED (LED) (350mA forward current per channel)
  • 3x BC 547 (Q1)
  • 3x IRFZ44N (Q2)
  • 1x 5V, 2A power adapter

Guts

The guts of the pumpkin

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