This controller capacitively senses the proximity of the users hand and controls the dryer’s fan motors and 2kW air heater accordingly, as well as multicolour LED illumination of the hand well.

The heating level (not just on/off) is controlled over time using a triac to manipulate the mains voltage waveform applied to the heater.

A whole range of subtle lighting colour combinations are possible with RGB multicolour LEDs, not just red, green and blue.

A whole range of subtle lighting colour combinations are possible with RGB multicolour LEDs, not just red, green and blue.

A whole range of subtle lighting colour combinations are possible with RGB multicolour LEDs, not just red, green and blue.

This board acts as a sub Gigahertz ISM band transceiver for connection to an Android tablet or smart phone.

The RF Tag can be detected over a good range, even inside, allowing the carriers presense or absense to be detected.

It is a surprising complex task to control LED trailer lights due to the variety of control methods and signals used in modern cars.

This shows the board mounted in a car trailer connector. You can see the self resetting fuses (yellow) used for circuit protection.