Controlling a TENS (muscle stimulator) device

[Idahowalker]

It's probably better to use a MCU to build a tens unit rather than make an MCU control an existing analog tens.

These words "arduino diy tens unit" bring up a number of interesting hits

creating a controllable tens machine

I investigated Arduino-controlled TENS last year. After some internet research I determined that it needs short (less than 1ms) pulses of constant current, up to about 30mA @ up to about 100V. The pulses are supposed to be alternating polarity to prevent electrolysis. In a multi-channel TENS unit, all the channels should be isolated from each other, since you don't want current flowing between different pairs of electrodes. I came to the conclusion that the easiest solution was to use a transfo…

DIY TENS Machine

and several more hits.