Pumpkin
A carved pumpkin with a high-powered LED that I made for Halloween 2011.
Video of pumpkin in action
Building
- Soldering instructions and general circuit design from Power LED's - simplest light with constant-current circuit
- Specific circuit from High Power LED Driver Circuits
I built out the project in this order:
- Build constant-current circuit on a breadboard to power one LED channel
- Adapted the circuit to use the Arduino
- Wrote a bit of code to test out PWM
- Soldered the three drivers
- Hooked everything up to the Arduino & tested (put the three drivers in parallel)
- Coded up the light show
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