Etching controller v2 by classdisk

Cloned from Sketch Etching controller v2 by michal7

A MicroView based controller for a custom built PCB etching tank - refactoring
Schematics will be posted later. Hardware consists of: - a [MicroView](http://microview.io), - a rotary encoder & a button, - a thermistor, - a pair of IRF520 N-MOSFETs, - a silicone heater pad, - a fountain pump, - a modified laptop PSU (converted to 12V), - a 5V SMPS, - a LED stripe.

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