# OnOff SHIM compatible with Waveshare 3.5inch RPi LCD (B)

**URL:** <https://forums.pimoroni.com/t/onoff-shim-compatible-with-waveshare-3-5inch-rpi-lcd-b/22885>\
**Category:** Support\
**Created:** [September 5, 2023, 8:22pm UTC](https://forums.pimoroni.com/t/onoff-shim-compatible-with-waveshare-3-5inch-rpi-lcd-b/22885 "2023-09-05T20:22:41Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![nestor](https://avatars.discourse-cdn.com/v4/letter/n/e495f1/32.png) [@nestor](https://forums.pimoroni.com/u/nestor)\
**Post date:** [September 5, 2023, 8:22pm UTC](https://forums.pimoroni.com/t/onoff-shim-compatible-with-waveshare-3-5inch-rpi-lcd-b/22885/1 "2023-09-05T20:22:41Z")

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I’m using a Raspberry Pi 3 Model B V1.2 together with a Waveshare 3.5inch RPi LCD (B) in a project. I’m considering adding a Pimoroni OnOff SHIM as a quick and easy way to get a power on/off button. However there are some overlapping pins which can be seen here: [https://www.waveshare.com/wiki/3.5inch\_RPi\_LCD\_(B)#Interface\_definition](https://www.waveshare.com/wiki/3.5inch_RPi_LCD_(B)#Interface_definition)

Before buying the OnOff SHIM, and potentially messing something up, I wanted to ask if somebody knows off hand if this combination is OK or not?

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**Author:** ![bablokb](https://avatars.discourse-cdn.com/v4/letter/b/ee59a6/32.png) [@bablokb](https://forums.pimoroni.com/u/bablokb)\
**Post date:** [September 6, 2023, 10:13am UTC](https://forums.pimoroni.com/t/onoff-shim-compatible-with-waveshare-3-5inch-rpi-lcd-b/22885/2 "2023-09-06T10:13:48Z")

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As you said, there are some overlapping pins, well, it is a single pin that causes problems: GPIO17 (physical 11) is used for the button and the touch interrupt.

So no chance to use this shim with the waveshare.