Simple Optical Meter Sets New Standards For Documentation

PiggyMeter is a wonderful example of a device that you never knew you needed – simple, elegant, easy to build, and accompanied by amazing documentation. It’s a snap-on interface for ele…

Smart Powermeter Uses E-Paper Display

In most places around the world, electricity is getting ever more expensive. Cutting back on your usage is one of the easier ways to escape this pain. This smart powermeter from [JGAguagdo] may pro…

Hackaday Prize 2023: Pi Pico Measures Volts, Amps And Watts

Measuring a voltage is pretty easy: just place your multimeter’s probes across the relevant pins and read the value. Probing currents is a bit trickier, since you need to open up the circuit …

Experimenting With 20 Meters Of Outlet Adapters

You may have seen some of the EEVblog dumpster dive videos, where [Dave Jones] occasionally finds perfectly good equipment that’s been tossed out. But this time, rather than a large screen mo…

Electromagnetic Interference For Fun And Profit

There was an urban legend back in the days of mechanical electricity meters, that there were “lucky” appliances that once plugged in would make the meter go backwards. It probably has i…

Live Energy Monitor Helps Plan Power-Hungry Appliance Use

There are a lot of good reasons to have a better understanding of one’s household power use, and that is especially true for those that do their own solar power collection. For example, [Fred…