# Noise on a esp32

**URL:** https://forum.core-electronics.com.au/t/noise-on-a-esp32/8788
**Category:** Uncategorized
**Created:** [15 November 2020 22:16 UTC](https://forum.core-electronics.com.au/t/noise-on-a-esp32/8788 "2020-11-15T22:16:18Z")
**Posts on this page:** 5
**Page:** 1

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### Author: ![Nicholas95249](https://avatars.discourse-cdn.com/v4/letter/n/839c29/32.png) [@Nicholas95249](https://forum.core-electronics.com.au/u/Nicholas95249)
#### Post date: [15 November 2020 22:16 UTC](https://forum.core-electronics.com.au/t/noise-on-a-esp32/8788/1 "2020-11-15T22:16:18Z")

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Hi  
Can any advise on what I can do to resolve this problem.  
I have a esp32 switching a mosfet to dim a led strip at 24v.  
And I have normal open push button that is switching on then off randomly even with a external pull down resistor.  
The switching of the gpio stops when ever the led strip turns off  
Thanks

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### Author: ![Liam120347](https://yyz2.discourse-cdn.com/flex028/user_avatar/forum.core-electronics.com.au/liam120347/32/5003_2.png) [@Liam120347](https://forum.core-electronics.com.au/u/Liam120347)
#### Post date: [15 November 2020 23:18 UTC](https://forum.core-electronics.com.au/t/noise-on-a-esp32/8788/2 "2020-11-15T23:18:28Z")

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Hi Nicholas,

Would it be possible for you to send through some picture of your setup?

A quick test for your button would be to connect a battery and LED up in series like this:

 ![image](https://canada1.discourse-cdn.com/flex028/uploads/core_electronics/original/2X/2/2a3e64404afcad0ad6427f422d42dc43417f589c.png)

Regards,  
Liam.

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### Author: ![Nicholas95249](https://avatars.discourse-cdn.com/v4/letter/n/839c29/32.png) [@Nicholas95249](https://forum.core-electronics.com.au/u/Nicholas95249)
#### Post date: [16 November 2020 00:09 UTC](https://forum.core-electronics.com.au/t/noise-on-a-esp32/8788/3 "2020-11-16T00:09:14Z")

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![image](https://canada1.discourse-cdn.com/flex028/uploads/core_electronics/original/2X/d/d44d394bf7c44e2bbd3ecb2c7931dae2ff51aeec.jpeg) ![image](https://canada1.discourse-cdn.com/flex028/uploads/core_electronics/original/2X/2/27ee2fc98a1940ce0bc878fef9106333634aa562.jpeg)

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### Author: ![Liam120347](https://yyz2.discourse-cdn.com/flex028/user_avatar/forum.core-electronics.com.au/liam120347/32/5003_2.png) [@Liam120347](https://forum.core-electronics.com.au/u/Liam120347)
#### Post date: [19 November 2020 02:25 UTC](https://forum.core-electronics.com.au/t/noise-on-a-esp32/8788/4 "2020-11-19T02:25:04Z")

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Hi Nicholas,

Thanks for sending that one through!  
And sorry about the delay.

Just to confirm your circuit looks something like this?  
 ![image](https://canada1.discourse-cdn.com/flex028/uploads/core_electronics/original/2X/5/5e5a14d7b02a59a601b547f4496347c56e0802df.png)

NB: There might be some interference between higher voltage wires running parallel to the input of the ESP.

Regards,  
Liam.

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### Author: ![Nicholas95249](https://avatars.discourse-cdn.com/v4/letter/n/839c29/32.png) [@Nicholas95249](https://forum.core-electronics.com.au/u/Nicholas95249)
#### Post date: [19 November 2020 02:51 UTC](https://forum.core-electronics.com.au/t/noise-on-a-esp32/8788/5 "2020-11-19T02:51:20Z")

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Hi Liam  
Yes looks like it  
I’m going to have to use a opto coupler I thank  
Thanks  
Nick