How to use a RELAY with ESP8266 NodeMCU | Easy Guide

Code and Circuit Diagram-
github.com/INO...

[@jacob1284]

I done checking my connection between relay and esp32, everything is okay but my relay do not make sound like your. Is my relay broken?

[@ahmadjadelrab]

Can I connect directly to a relay without a relay module?

[@INOVATRIX]

It is possible but very risky as it can easily damage the board so it it advised to you a module.

[@testcorohelp6329]

Hi can I use 8 channel 5v relay modules with 3.3v nodeMCU ? or do I need to use anything else?

[@INOVATRIX]

You'll need external 5v supply, node MCU can power max 2 relay.

[@sudarshanm9104]

Can I know how to control two channel relay module?
My idea when a fault is detected I want turn on led using relay,I have three faults so iam using two 2 channel relay modules can I know the connection

[@INOVATRIX]

Is is basically the same process, if you look at the code you can just add another line for a new relay and name it differently and connect it to a different pin.