This is a very simple way to control a 3-phase AC installation in a delta configuration.
It came with only an on/off switch. Adding an UNO to this LED chalkboard really gets your attention - it is quite a flashy pig.
Monitor your daily water usage, donate water for remote areas, crop plantation using IoT.
This circuit divides the voltage to three ranges: 12V DC, 9V DC and 5V DC.
Measuring resistance of short conducting wire in milliohms is not possible with multimeters but they can measure millivolts accurately.