LED MENORAHS

We’re barely past Halloween and people are already working on their next LED based holiday decorations. For Hanukkah, Gizmodo pointed out the PCB menorah visualized above. It uses a set of DIP switches to control which LEDs are lit. A couple years ago, Evil mad scientist Laboratories put together a tutorial for building a a lot more minimal LED menorah. Each of the nine LEDs are soldered directly to the legs of an ATtiny2313 microcontroller. whenever you power up the device an additional LED is lit. [Ori] liked the project and made a decision to take a slightly different approach. He used an LM3914 DIP18 LED bar driver. A potentiometer controls how lots of of the LEDs are illuminated.