Colour Ring

The initial idea for this project came out of a session I was attending the Masters Conference 2017, where practical usage of Arduino has been discussed.

In addition, I've added

• two LiIo-batteries along with a protection circuit
• voltage divider for sensing the battery status
• two touch button fields for a bit of interaction
• buzzer for accustic feedback during user input

All are embedded in a nice looking wooden socket, where a cavity has been created.

The ring itself is not hard-wired but simply place in the holder and connected via metallizations and some additional magnets

At the start, 7 LED will be turned on in blue; as more red comes on, as less power is remaining in the batteries. All LED in red indicates a voltage level of 7V, so the charging is recommended.

I've realized, the LED reflection angle is pretty dense so I needed a type of "diffusor". The easiest way is to use a piece of hot shrinking tube which is placed of the LED. Not the best look but working pretty fine.

Getting the wooden ring was a hard one, however, found a cheap solution: simply search for stitching ring, similar to this one. Simply select diameter and material (wood or plastic)