so tonight I did my first real SMD soldering, on a pretty challenging chip :D

I desoldered the TP4056 ic from a dead SHA2017 badge, then made everything work on the smd-protoboard of the eth0 badge.
Great fun learning to do tiny soldering, and getting used to working under a microscope

It charges a single-cell lipo, and gives the charging status over a wire, something the prebuilt modules can't (they connect it to an onboard led instead).

Next up will be adding a voltage divider to get a battery voltage reading, and throwing this all into kicad (also a first for me)

and here's the schematic, the TP4056 is a great simple chip. I used 2.2K ohm for Rprog, but with 1.2K it will charge the fastest (1A)

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I'm now turning this into a pcb module, starting with the schematic.
Adding USB-C wew

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