Hobby Projects - Insulation tester, LED Circuits, Meters.

Friday, December 14, 2007

Simple Cheap Dark-Detecting LED Circuit

Here's a simple problem: "How do you make an LED turn on when it gets dark?" .....Complete
Simple Cheap Dark-Detecting LED Circuit
Parts -On top: a CR2032 lithium coin cell (3 V). On the bottom (L-R): the LED, an LTR-4206E phototransistor, a 2N3904 transistor, and a 1 k resistor. This LED is red, blindingly bright at 60 candela, in a 10 mm package. It casts a visible beam, visible for about twenty feet in a well-lit room.
  • LED Mini Menorahs:: Open source kits
  • Projects with Bre Pettis: Make a Joule Thief
  • MiniPOV Cylon firmware
  • Interactive LED Coffee Tables
Evil Mad Scientist Laboratories

Thursday, December 13, 2007

ladyada of Limor - Electronic Gadgets

"Most of the stuff on this site is related to the electronic toys, gadgets and art that I've worked on since 2003."

ladyada.net of Limor - Electronic Gadgets

Projects -
  • MintyMP3 mp3 player
  • MIDIsense simple extensible sensor interface
  • Open-Source USB AVR programmer and SPI interface
  • Open-Source prototyping shield for Arduino NG/Diecimila
  • Learn electronics and microcontrollers using Arduino!
  • Easy tutorial for starting out with basic AVR programming