The primary obstacle in developing this project was building a successful antenna system - an EMF antenna is deceptively simple - just an piece of conductive material attached to an analog input. However getting the antenna to work effectively is much harder. I ended up trying about 6 different antenna designs - the large coil was the most sensitive but was somewhat directional and an alternative version of the copper disc was a good non-directional antenna - the woven disc antenna that is on the final device was less effective than a more solid disc but the larger coil antenna was strong enough that the additional antenna was more aesthetic than functional anyway.

The analog input of the antenna needed to be pulled to ground over a very high impedance resistor on the order of (4+ MOhm) in order to function - which is a somewhat uncommon resistor value. I was able to find a 10 MOhm resistor in stock at ideate. The vibration in the handles is created using two small "pager" vibrating dc motors connected to the Li+ power rail modulated by PWM from the Particle Argon via two pn2222A transistors. The rest of the circuit is relatively straightforward with two potentiometers connected to analog inputs and three digital inputs for the three switches.