GPIO16 issue of ESP WROOM32

[jadhavashitoshj48]

Should I make 12 V and 3.3 V ground isolated from each other?

[mikemoy]

Should I make 12 V and 3.3 V ground isolated from each other?

yon dont need to and if you did, then you would need to add opto isolators from ESP32 to the ULN2803's.

I am more curious about your power power supplies. Have you looked at the 3.3v power rail right at the ESP32 power pin to make sure there is no spiking when a relay activates?

Also, is this design on a PCB or a prototype board with wires in the air ?
I ask because layout is important, you could be picking up inductive noise from the relays onto other wires on your design.
are you willing to snap a photo of your setup ?

[AshIsPurestWhite]

Hi jadhavashitoshj48,
For the relay drive circuit，
1. try to add a flywheel diode across the coil
2. try to add a RC Snubber between NO and COM

see more infomation here: https://www.electronics-tutorials.ws/bl ... rcuit.html

[malaugh]

You may want to change your code to debounce the switch. Rather than just using the interrupt when the switch closes to trigger the action, use the interrupt to start a timer, sample the switch say every 10mS, and only trigger the action if the switch sample is low for say 3 samples in a row. This prevents the action triggering on small glitches on the GPIO.