u/Hissykittykat

Action Shot

The table spins and flashes red when a wireless charging device is present and charging. It stops automatically when charging is complete. The knob varies the table spin speed. Runs on 12V and has a high power Qi charger built in. An Arduino inside senses the Qi charger state and controls the LEDs and motor.

The Arduino code is pretty trivial; it's posted with the project on Thingiverse along with an electrical diagram and 3D print files.

My controller chip on my battery welder (one of those 3000F capacitive ones) quit so I built a new Arduino controller; it's very simple, a foot switch turns on the MOSFET gates for a few milliseconds. But it's too powerful now. It's throwing a lot of sparks and disintegrating the nickel strips. The original design used an EL3H7 optocoupler to drive the MOSFET gates for some reason. I pulled the 16 pin microcontroller and optoisolator and hacked in the Arduino controller. My rework drives the gate directly from a GPIO with an independent power supply so the MOSFETs turn on fully for the entire weld cycle. Is it possible the optoisolator design results in a better welding current profile? Or is it something to do with using the same supply for the welding and gate drive circuits?