Hello All, I need a device that I can input an open/close state of a relay. Could anyone please recommend one that is easy to use? Can be ethernet or wifi. Hope everyone is having a great day!

ESP devices can do that easily and they are cheap. Soldering skills may be necessary

Cheers, soldering no problem. Will check them out now.

As @krambriw said, ESP devices are inexpensive and can do a lot of things. The ESP32-S2 Mini is very inexpensive and has lots of I/O pins, analog as well as PWM. Oh and yes - it is WiFi enabled. Recently I've been programming my devices using MictoPython. [image] S2 Mini based on…

Cheers DynamicDave. After looking at the ESP32 I realised I have a raspberry pi sitting here doing nothing and looks like I could use that to send the message to node-red on my PC?

Run node red on the pi as well and get the data to the pc using mqtt. Or even do everything on the pi and just run the browser on the pc.

Well two things to consider... (1) Make sure your inputs to the RPi are within 0V to+3V3 Put some resistors in there to limit the current/voltage. (2) ESP32s or ESP8266 can be deployed at various places around your home to sense and report conditions. They are much cheaper than a RPi - so if you…

To put the Tasmota firmware inside the espxxxx you can use this easy way via an web page https://tasmota.github.io/install/ Or if you want to use the Esphome firmware, here is the link https://web.esphome.io/ Both firmware can report gpio status via mqtt There is also Esplink

[image] dynamicdave: Make sure your inputs to the RPi are within 0V to+3V3 That is correct. @btbr , you indicated that you have a relay contacts input, so presumably there are no volts on it. Connect one of the relay contacts to 0V on the Pi, and the other to a GPIO Input, with something lik…

[image] Jean-Luc: There is also There is also node-red-mcu if you want to run Node-RED flows on such devices...

Very clear instructions on it. Good to know. Thanks Bart

Node-RED

Node-RED Forum

Best input device for open close

General

BartButenaers 5 June 2023 05:16 10

There is also node-red-mcu if you want to run Node-RED flows on such devices...

Topic		Replies	Views
Set ESP32 output w/o using MQTT General	8	316	22 October 2023
Getting I/O signals from old machines to communicate with Node-RED Industrial	5	216	13 February 2026
Windows GPIO input? Hardware	6	466	16 August 2023
How can I control a relay using MQTT? General function-node , mqtt	8	1341	2 May 2022
Send data using WLAN from Serial control node (ttyUSB0) from Raspberry Pi Zero W to a Raspberry Pi 4B General	25	231	5 June 2026

Copyright OpenJS Foundation and Node-RED contributors. All rights reserved. The OpenJS Foundation has registered trademarks and uses trademarks. For a list of trademarks of the OpenJS Foundation, please see our Trademark Policy and Trademark List. Trademarks and logos not indicated on the list of OpenJS Foundation trademarks are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them.

Best input device for open close

Related topics