hi, i’ve just purchased the OnOff shim and i’ve wired up the shim (via breakout to breadboard) to 5v and ground as well as connecting up the status and power off pins. when i press the button, the Pi will power up, but the moment i release the button the power will immediately shut off (no gracefu…

Have to ask the obvious question, power going in the micro USB on the shim? I do believe the software is only for shut down. So it should latch the power on when you press the power button the first time. Are you just doing a quick button press? If yes, it sounds like its defective.

yes, power is going in the micro usb on the shim. the Pi gets power just fine when i press the button, but only when its pressed, the moment its released, the power is lost. this is the first Pimoroni product ive bought (through a local vendor). a real shame if its a dud, is this common?

I don’t think so? I don’t own one myself. There were some other threads on the on off shim, don’t think it was the same issue though. Duds happen sometimes. The few times its happened to me I got quick replacements.

What are you referring to when you say “1 wire enabled”. Currently I have tested with just the 5v and ground connected and separately with the two logic signals. Is there anything more than the 5v, ground and two logic signals involved to used this? Some more thorough documentation on this shim wou…

Pinout can be found here, https://pinout.xyz/pinout/onoff_shim# You need GPIO 4 and 17 wired up along with GPIO Pin 2 for 5V to the Pi and GPIO Pin 6 for Ground. Software install is listed there too, run the following from terminal. curl https://get.pimoroni.com/onoffshim | bash

1 Wire is a GPIO Interface you can enable to connect sensors etc. It also uses GPIO Pin 4. If you don’t know what it is, its likely its not an (the) issue. If you had enabaled it for something else you were using with that Pi it would interfere with how the on of shim works. Well I think it would @g…

thanks, seeing as iv been testing without the two logic pins connected, this does not sound like this is the issue (as an aside, even with the logic pins connected, im not using 4 and 17, ive moved them to 23 and 24 using the setup file, hence why i have not mounted the shim directly). does it mat…

No as far as I know it doesn’t matter what 5V or ground Pin you connect to on the GPIO. All the Grounds will be a common connection anyway. The two 5V will be a common connection too. Hopefully the second one gets you all sorted.

Could you possibly post a photo of your wiring/setup? Could be worth me trying to recreate it. Just a thought- have you connected 3.3v? It needs the 3.3v from the Pi as a reference to feed into the low-voltage comparator. Without this reference, it’ll simply think the battery is depleted and shut d…

OnOff Shim wont stay on

Support

gadgetoid December 12, 2017, 5:08pm 5

Do you have 1-Wire enabled?

See: On/Off Shim Instant Shut Down

Topic		Replies	Views
OnOff Shim does not switch my RPi 3+ off Support	29	2663	January 17, 2020
OnOff Shim turns Pi off but will not turn Pi On Support	5	87	September 24, 2025
OnOff Shim keeps causing reboot Support	13	1375	March 14, 2019
OnOffShim Support	5	791	June 28, 2018
OnOff SHIM Not Rebooting - Raspberry Pi 3 B+ Raspberry Pi	18	2410	February 21, 2019

OnOff Shim wont stay on

Related topics