The steering wheel has had another revision, this time with a NeoPixel Ring, an Arduino Flora and a HC-05 Bluetooth module, all combined into a 4 cm circular unit, less than 15mm deep, perfectly sized for the steering wheel centre.
This is the Flora, the NeoPixel ring and Bluetooth unit are all sized to fit within the diameter of the Flora. I have designed the centre cover that will show system status, lights, fog lights, beam and indicator status. Just trying to find a supplier who will make a reverse laminated one off for me. This photo is showing the paper based mockup, but the final article should look the same.