How to use a RELAY with ESP32 | Easy Guide

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Additional Board Link

Code and Circuit Diagram

[mohankanth]

Please everyone note that
Only relay with optocoupler works well in ESP32

The configuration of relay without optocoupler won't work in ESP32 due to direct grounding in relay module

[ah-lxxi]

Interesting but a few questions if you can answer please.
1. How many relays can you control? Relays to open close a solenoid coil actuator.
2. To make use in a practical application such as an ESP32 camera installed, detecting an apple. If it's in center of picture open door_center. If it's to the right, open_door right. If it's to the left open door_left

If you can help out, otherwise thanks, still an interesting short video.

[snimavat]

This is 5v relay, needs 5v power supply and 5v logic level, how does it work with esp32 which is 3v3 ? - is it reliable, could it damage the board ?

[mrpid]

what is the wiring configuration for the other side of the relay?

[sakethkashyapnagendra]

Mine is switching only once, that too before uploading completely, how to fix?

[kishoriPremi]

bro 3.3 and 5v pin of esp32 is used to supply power to esp32 but how we can use it for externa purpose this will harm our board

[my]

Does anyone sell a relay board that just plugs into the headers on the dev kit board?

[emilcost]

Where do you supply power if you disconnect the usb cable?