The B-button v2.0

I've added a wire and 2 resistors(10k and 22k) to get ~3.3v from the battery controller's power input so the raspberry pi can sense when the power supply is disconnected and automatically shut down.

I've added automatic shutdown to the button daemon and set a delay of 60s so it won't shut down in case of temporary power failure(or when you need to move the device to a different power socket).

I've been trying to get a clear sound out of the PlainDAC+ but I keep getting stuttering sound. I've tried to install Pulseaudio but that only seems to worsen it, and I think it stresses the cpu more.

It could instead be vlc that needs some adjustments but as of now I'm not sure yet.

I received the battery last saturday, and after connecting it to the charging/protection circuit I quickly discovered the circuit was getting unusually hot, so I disconnected the battery and determined the resistance between the battery connection points was near 0. Great protection circuit.

I had another one lying around that still has a usb host connector, I'll use that one and keep the usb connectors so it's easier to replace.

The Raspberry Pi Zero arrived yesterday, I've soldered the PlainDAC+, buttons and a usb connector to the board with some wires so I don't have the usb plug for the wifi adapter sticking out the side. I also got the basic functionality of the software going but the device is currently on my desk with its guts in a bowl.

The usb connector, based on this hack.

Next step is getting it to work as wifi Access Point so it'll work anywhere. I might add a button combination to switch between AP and client mode so you can revert if the connection fails.

I'll wait with finishing the hardware part until I've received the lithium polymer battery so until then it's software tweaking.