CodeBox

The Code Box was built for our "Special Ops" campout for a Boy Scout Troop. It consists of a BS1-USB microcontroller, two LED's and a phototransistor. The box sits in a tree or bush near ground level. The Red/Green LED alternates flashing red or green about once every five seconds. This is the locator beacon. When the scout sees it, he shines a LASER pointer at it.

The RG LED will flash quickly a few times then the white LED will emit a coded message in short/long pulses of light. Once that cycle is complete, the box goes dormant for about 2 minutes.

All opened up	Wired view Note resistors inline with LED leads		In beacon mode	Rear view This shows the bolt stubb used for mounting.
Schematic (no power switch shown)

This is a link to the code