A meter to measure the electrical parameters of devices connected to a USB socket or charger would be handy on any hacker workbench. The folks at [electro-labs] designed this simple USB power ...

Energy is expensive these days. There’s no getting around it. If, like [Giovanni], you want to keep better track of your usage, you might find value in his DIY energy meter build. [Giovanni ...

Here is how the power meter does it: 1. Current passes through the meter on the way to the circuits inside the house (and again on the way back out). As the current flows through the meter, it ...