ESP32 not functional with single-channel relay

arfath
Posts: 2
Joined: Thu Nov 07, 2024 8:04 pm

ESP32 not functional with single-channel relay

Postby arfath » Thu Nov 07, 2024 8:48 pm

Hello,

My ESP32 doesn't seem to want to blink a single-channel relay ON/OFF on its GPIO pins, no matter which ADC1/ADC2 pin I tried. It blinks an LED just fine but just not the relay. I tried implementing this with an Arduino Uno and the relay blinked just fine. I also restored the ESP32 to its factory settings and it didn't resolve. I don't know what I'm doing wrong to face this issue.

ESP32 Model: ESP-WROOM-32
Relay Model: TONGLING 5VDC, JQC-3FF-S-Z

Please help.
Thank you.

MicroController
Posts: 1724
Joined: Mon Oct 17, 2022 7:38 pm
Location: Europe, Germany

Re: ESP32 not functional with single-channel relay

Postby MicroController » Fri Nov 08, 2024 1:33 am

arfath wrote:
Thu Nov 07, 2024 8:48 pm
Relay Model: TONGLING 5VDC, JQC-3FF-S-Z
The relay may not be able to work with the 3.3V signals from the ESP.

aliarifat794
Posts: 198
Joined: Sun Jun 23, 2024 6:18 pm

Re: ESP32 not functional with single-channel relay

Postby aliarifat794 » Fri Nov 08, 2024 6:44 am

The TONGLING 5V relay module typically requires 5V on its VCC pin, but the ESP32’s GPIO pins only output 3.3V. This difference in voltage could cause issues since some relays may not trigger reliably with only 3.3V.

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