I’m using the Pimoroni Pico LiPo Power SHIM.
Sometimes if I remove the battery and then replace it, the SHIM and Pico do not wake up.
Sometimes when that happens, but not always, if I push the little button on the SHIM, it wakes up.
Always when that happens, removing the SHIM from the Pico wakes up the Pico.
Anyone else reporting this kind of issue?
Welcome to the forums. =)
By “wake up” do you mean turn on?
My Pico Shim is soldered to the back side of my Pico. I can’t unplug it from the Pico, just FYI.
For me, it retains the last state it was in. If it’s turned on when I remove the battery, it will turn back on when I plug a battery back in. And if it was off, it will be off if I plug a battery back in.
EDIT:
My testing was done with the battery only unplugged for a short duration. I’m not sure what happens if you wait a while before plugging a battery in?
EDIT: No.2
It looks like if you leave it unpowered for a few minutes it will default to off.
My experience is that it is inconsistent. Sometimes I can press the button to turn it on (even though it was never turned off except by removing the battery). And sometimes it won’t turn on at all unless I plug USB power into the Pico.
And this is going to be inside a sealed box. There will not be any access to that button.
The toggle-circuit of the Lipo-Shim uses a flip-flop. In my experience, you cannot control the state of the flip-flop at POR (power-on-reset). The flip-flop is powered by the lipo xor the USB-power from the Pico. So in case you don’t have the Pico powered and then plug in the lipo, the state is not consistent.
Hm, this should not happen. I also have one of these shims and don’t experience any problems, so this might be a hint that your specimen is faulty.
I don’t think this is a good idea.