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	59	333	August 22, 2025
Problem with Arduino losing power due reley activation and not working until reseting! Flyback diode? General Electronics	155	244	January 11, 2026
Control 68 solenoid valves with 68 relay but it fails when they connected with valves Product Design	32	538	August 4, 2024
Does this relay switch have a flyback diode? General Guidance	64	1097	November 30, 2024
Driving a/c solenoids General Guidance	15	188	August 24, 2025