AVR-based Li-Ion battery charger

If you ever worked with lithium batteries, you probably know the TP4056 – a chip for charging lithium batteries with CC-CV profile, two LEDs for state-of-charge indication, temperature input and so on. You can find it relatively cheaply on Ebay or similar sites, either as standalone IC or on a small and very practical breakout … “AVR-based Li-Ion battery charger”

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Seven Segment Multifunction Display

Often, when I am prototyping something on a breadboard or elsewhere, I need to see voltage levels at multiple points of the circuit. Of course you can hook up multiple multimeters, but a) I don’t have that many multimeters and b) they are usually relatively big and take a lot of space on my small … “Seven Segment Multifunction Display”

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Brymen BM867/869 interface cable

Recently I was looking for a good and precise digital multimeter to buy, and the Brymen 867, a 50000-counts handheld DMM, immediately caught my eye. It even had the PC interface I wanted, since I want to use it for some automated measurements. So after a bit of research, I finally decided to buy it … “Brymen BM867/869 interface cable”

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