[Andrey] from RTFM has built himself a glowing LED pendant using only three parts and some easy code. The hack is not particularly complicated but [Andrey] offers some good instructions on Pickaxe programming through an RS232 serial port and RGB LED control to produce the good glowing effects. The pendant includes an RGB LED, a Pickaxe-08 microcontroller and a couple of button cell batteries. To cram everything inside the locket, [Andrey] had to grind down the LED and Pickaxe-08 to their minimum dimensions using a file.

All of the basic code for the pendant is supplied on the project page and [Andrey] describes how he manages to PWM all three LED pins for the colour effects. The video after the break may be of interest to anybody who has not had a go at Picaxe programming before or for a beginner who wants to try out some new embedded devices without a big hit to the wallet.