I'm making a simple watering system that operates a solenoid valve via a 5v relay connected to a 12v battery. 1. Do I need a flyback diode on the solenoid? I'm guessing that the relay will protect the Arduino from flyback and noise, but it wouldn't hurt to add a diode to protect the relay. Solenoi…

Flyback diode required for relay board and 12v solenoid?

LarryD December 5, 2016, 12:18am 6

Topic		Replies	Views
How to properly connecting a 12v relay with arduino - solenoid control General Guidance	60	508	February 18, 2026
Problem with Arduino losing power due reley activation and not working until reseting! Flyback diode? General Electronics	155	289	January 11, 2026
Control 68 solenoid valves with 68 relay but it fails when they connected with valves Product Design	32	543	August 4, 2024
Does this relay switch have a flyback diode? General Guidance	64	1182	November 30, 2024
Still more problems with 3v relays and Arduinos General Guidance	60	244	March 23, 2026