Pumpkinlight!

I put together a simple AVR-based device to stand in for the tried-and-true pumpkin candle this year. It uses two high-output (12,000 mcd) white LED's driven (a little too hard) by a regulated 5v supply that's shared with an ATtiny13v. All of this runs off of a 9v battery and should last for days given the tiny amount of current it draws.

The bill of materials isn't super long, and I had everything on hand so putting it together was pretty easy. I free-formed the first one, wrote the AVR Studio assembly code, then went back and made a proper schematic and built the second one. The first one is a lot uglier than the second due to all the rework and the extra wiring for the ISP connection.

C1 10uF
C2 100uF
G1 AB9V
IC1 ATTINY13V-10PU
IC2 LMS8117AMP-ADJ
LED1 High output white 5mm
LED2 High output white 5mm
R1 150
R2 470
R3 120
R4 120
R5 10k This is a 10k for a pull-up on the RESET pin
S1 Small SPDT sliding switch
T1 2N3904 Any small signal transistor will do
T2 2N3904 I used the 2N3904 because I have a big bag of them

Here are all of the materials required, assembled in marching order:


Here's the schematic:



Here's the finished product (the second one... after I knew what I was doing. My layout still sucks, but it all fits and is fairly orderly.)