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”

Read More

Simple camping light/torch

One of the most useful tools when camping is a flashlight. They come in a ton of different shapes – headlamps, torches, lanterns… I have a good headlight, but sometimes I want to, say, illuminate a whole tent or a room. For this a headlamp is not suitable, because it is very directional. So, from … “Simple camping light/torch”

Read More

3D printed charger for Yi 4K camera battery

I own an action camera – the Yi 4K – and I am very satisfied with it. However, even though it has longer battery life than a GoPro, it still runs for only ~90 minutes on a single battery. For this reason, I bought a bunch of replacement batteries from Ebay for just 6 dollars/piece! … “3D printed charger for Yi 4K camera battery”

Read More

Multicell Lithium Battery Charging & Balancing circuit

You probably know that charging lithium batteries isn’t particularly easy. But if you have just a single cell, you can get an IC to do this for you – the most popular being probably the TP4056 or the MCP73831 (you can get both of them from Ebay). But if you want to have a battery … “Multicell Lithium Battery Charging & Balancing circuit”

Read More

Lithium Battery Utility Board V1.2

I use lithium batteries a lot. However, they are not the easiest to use – you need a dedicated charging IC, complicated protection circuitry, boost module to power 5 V circuitry, switches, connectors… So I designed a board with all of these features. This is hopefully the last and final revision of my Lithium Battery … “Lithium Battery Utility Board V1.2”

Read More