Posts Tagged ‘circuit’

Here’s a simple problem: “How do you make an LED turn on when it gets dark?” You might call it the “nightlight problem,” but the same sort of question comes up in a lot of familiar situations– emergency lights, street lights, silly computer keyboard backlights, and the list goes on.

Last year I found a United States Patent that showed how to collect ambient energy right from the air. I finally decided to build this curcuit just to see what it could do.

Here is a neat little project idea. I recently picked up a cheap china made desktop weather, clock, humidity unit. I found that if I attached one cheap solar panel from a junk garden lamp this thing would stay running just from the lights in the room sitting on my desktop.

The motion sensor led light is a cheap light I got from ebay for around $5.00 I found that it took only 2 AAA batteries although the battery holder can hold up to 4 AAA’s.

Here is a little light I created using a cigar box I got from the local smoke shop.