Leaving GPIO floating?

[Ulf Holt]

Maybe a silly question:

Is it best to pull most GPIO pins high with a 10 k resistor on ESP32 modules or is it ok to leave them floating?

I am using ESP32-c3-WROOM in some of my projects, and I know about GPIO8 and GPIO9 and how to configure them. The documentation also recommend to pull GPIO2 high, but what about the rest (except for reading input values, I recon).

Best regards

Ulf H.

[Philip Knowles]

Most of the GPIO have internal pullups. If the GPIO have no been allocated to inputs they can float but, if a GPIO is being used as an input, it is best practice to 'force' the state using pullup or pulldown resistors.

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From: sonof...@googlegroups.com <sonof...@googlegroups.com> on behalf of Ulf Holt <ulf....@gmail.com>
Sent: 03 May 2025 14:20
To: TasmotaUsers <sonof...@googlegroups.com>
Subject: Leaving GPIO floating?

 

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