The Sonoff doesn’t use the ESP’s ADC pins, so he’s broken one of them out on a lead to a current transformer which ... ESP port of an Arduino current sensing library. To round off the ...

Current sensing resistors without leads are also available. Bolt-on to a chassis - By attaching solidly to a metal surface, these chassis-mounted resistors provide maximum heat dissipation. Surface ...

[Open Frime TV] has a video addressing this in a novel way, by creating the windings for a switch-mode power supply transformer using stacked PCB coils instead of wire (Russian language ...