Water level based relay controller

Michael Lane · Oct 26, 2018

This is basically a one-shot ATO made to transfer about 50 gallons of RODI water to the mixing reservoir. Every once in a while, I forget that I started transferring water and panic that the mixing reservoir has overflowed. This will make sure that I always transfer just the right amount of water since it will automatically turn off once it reaches the specified level.
Plus, I wanted to make something using illuminated arcade buttons! Schematics and source code at https://github.com/Ranthalion/ButtonRelayControl.

Controller board

Connector side of the board

I just have to finish the enclosure next. I was originally planning to house it all with a 2 gang junction box, but it just doesn't fit.

Ranjib · Oct 28, 2018

Very nice

. Thanks for sharing

Michael Lane · Oct 30, 2018

I finally got around to finishing the enclosure and mounting it on the mixing station.

I mounted the sensor on the mixing reservoir with a bit of silicone.

And here's a shot of the whole mixing station.

I used 4 pin mini XLR connectors on this, and I think they are my new favorite connector! The other unpopulated connector will be routed to the level sensor on the top off reservoir, but it's about 30 feet away and I have to wait for more wire to arrive.