Looking at the schematic for the Pico LiPo, it looks like it might solve a problem I’m having with a project on Adafruit Feather Rp2040. I want to be able to switch the power on with a momentary action push button and off again with a GPIO. The use case is a zero power switch for my desktop computer…

Replying to my own question! I just got delivery of a couple of these (amazing delivery, crew, I ordered late Sunday and it was delivered to my home in rural Cornwall first thing Tuesday morning!). There is only one 8-pin chip labelled V74 Google reveals it to be 74LVC1G74 (probably). Sadly, while…

I seem to be talking to myself here, but just for closure, I did solve this one myself. First, I scraped the resist off TP1 and placed a push-button between that and VSYS&VBAT. That provides a non-toggling ‘switch on’ function (i.e. it cannot switch the power off). Then it occurred to me (not befo…

Small correction to the above: The non-toggling ‘on’ switch needs to be between TP1 and GND, not VSYS&VBAT. I also found the switch needed some extra capacitance from TP1 to GND in order to power up reliably ‘on’. A 10uF was fine. I also added a level shifter to VSYS&VBAT to drive a neopixel chain (…

Hi John, I had a similar use case with a pico and an e-ink display, push a button to turn on, perform a test, display result and power off. Instead of a level shifter I just used a 1n4148 diode between GP0 and the power button and this works a treat. Would be nice if they could consider it if ther…

The D-flip flops are so cheap and also available as DIP, so no problem to build this yourself on a breadboard or perfboard. A different ready to use solution is a TPL511x from Adafruit, not integrated with the LiPo powering though. As a side note: To be honest, I did not really understand the ori…

I agree with your comment regarding the OP use-case, what I was searching for was an easy solution that provided USB rechargeable battery power with built-in charging and a software controlled power-off function in lieu of having to roll my own and the LiPo Shim was the only one that ticked all but …

Afraid I cannot find either a photo or the modified board to take one. As I remember it, I built the circuit on an Adafruit adapter board (ADA1211) stocked by Pimoroni. This converts the surface mount chip package to through hole pads and you can also solder the resistors and capacitors on this. The…

Thanks for responding after such a long time, and thanks for the extra info. I’ll order some of those Adafruit adapter boards for testing, but then probably make a small board to house the 74LV1T86, switch, caps, etc. If this works I have to solder quite a few of them, so I want to make it as easy f…

The 74LV1T86 was used because of its level shifting capability (i.e. it allows a 3.3V GPIO to drive logic at a higher voltage, up to 5V), and because it was available in a small package with just two circuits rather than the more common eight channel packages. But there are many different approaches…

Pico LiPo Power Switch

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helpyhelperton September 15, 2026, 9:09am 8

I know this is an old post, but do you by any chance have any photos of where you soldered this mod? I would like to try this also.

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Pico LiPo Power Switch

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