ESP32 Forum

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.

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.

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.