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Microprocessor Controlled 12 LED Light

We wanted a small bright LED source to illuminate the bed of our MendelMax 1.5 3D Printer. What could be simpler than a 555 controlled design (or so we thought). Turns out make the 555 produce a PWM waveform with 0-100% pulse width is not a trivial matter. This design only goes from 50% to 100%. For LEDs that's barely dimmable. Our next stab at this was an 18 LED light which worked well.


  • 12VDC operation - compatible with Reprap power supplies
  • PWM control of White LED brightness
  • 555 Timer controls PWM
  • Small Form Factor
  • Four (4) 4-40 mounting holes

Design Files

GitHub Repository