Vermes
Advanced Member level 4
The project was taken from LINK, where useful attachments can be found.
The system is based on Attiny2313. Elements are mounted on the universal board. 3 independent sources of PWM signal work in this lamp. Every longer interval the filling factors change. Primary colours (RGB) light up in the Gray counter sequences. 1 means lit colours. With this transition, each change only one basic colour comes on or goes out. This control generates all possible combinations of colours and intermediate states between them.
Here are some pictures and the video.
Link to original thread (useful attachment) – Lampka RGB by piotr153