I'm currently using NodeRED to interact with the GPIO pins of my RPI4 board. All works pretty well, but when I'm rebooting my RPI I have a very short signal pulse to the relays that are connected to the GPIO output pins. Which means that strange things happen in my home automation (curtains closing,…

[image] rik1984: The question is still whether this will fix the spike You could presumably add debounce logic to the PLC that required a certain width input pulse to react, and set it greater than the spurious signal.

Topic		Replies	Views
No response from rpi-gpio Hardware	48	2912	14 December 2020
GPIO on Raspberry Pi are stopped General	26	990	16 July 2022
Experimental libgpiod GPIO nodes for Node-RED on Raspberry Pi Zero 2 W / Debian Trixie Developing Nodes	3	108	9 September 2026
Relays for dummies Hardware	65	8649	28 August 2019
Rasberry Pi GPIO pins not switching General	24	1116	24 April 2022

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.

Strange signal spike to GPIO pins at startup of NodeRED (Pigpiod)

Related topics