I have already stoned the gpio in esp 2x in 3 years. This concerns the gpio to which the reed switch is connected between ground and the gpio monitoring the opening of the gate. That it's a gate, the cable from esp to reed switch is like 25m-30m (twisted pair). I suppose sometimes some surge...

As standard as anything. Opto-isolation.

You do the separation on the relay.

Not even sometimes, or even quite regularly from sparking the contacts. I would suggest putting a gasifier on the contacts of the reed switch to start with. What voltage and current are you switching?

GPIO fail-safe in ESP with reed switch on long twisted pair cable (25-30m)

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#1 20535286 11 Apr 2023 21:21

jajen jajen

Level 17

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Post #1
20535286 11 Apr 2023 21:21

I have already stoned the gpio in esp 2x in 3 years. This concerns the gpio to which the reed switch is connected between ground and the gpio monitoring the opening of the gate. That it's a gate, the cable from esp to reed switch is like 25m-30m (twisted pair). I suppose sometimes some surge will be generated on it and this is the reason for the gpio getting stoned. Can anyone advise how to protect the gpio?
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#2 20535311 11 Apr 2023 21:29

xury xury

Automation specialist

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Post #2
20535311 11 Apr 2023 21:29

As standard as anything. Opto-isolation.
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#3 20535347 11 Apr 2023 21:40

78db78 78db78

Level 43

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Post #3
20535347 11 Apr 2023 21:40

You do the separation on the relay.
#4 20535467 11 Apr 2023 22:42

khoam khoam

Level 42

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Post #4
20535467 11 Apr 2023 22:42

jajen wrote:
I suppose sometimes some overvoltage will be generated on it and this is the reason for the gpio burning up. Can anyone advise how to protect the gpio?
Not even sometimes, or even quite regularly from sparking the contacts. I would suggest putting a gasifier on the contacts of the reed switch to start with. What voltage and current are you switching?
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GPIO fail-safe in ESP with reed switch on long twisted pair cable (25-30m)

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