Now, first of all let me tell you that I’m new at using relays and a newbie at Arduino so forgive me if what I’m doing is totally wrong.
What I was trying to do was connecting a 12V DC irrigation pump to an Arduino Uno through a 2 Relay Module, using a direct power supply (yes, no battery,)
It ended up pretty bad and I’m trying to figure it out if the reason is the power supply or the Arduino PIN.
I used the PIN 8 and for some weird reason, it was the only PIN that would turn on the red led on the Relay ( I guess that led means Undervoltage !?)
I’m sending you guys some pics also.
I’ve used this schematic for it
Note that instead of a battery I used a power supply…
Let me know what I messed up!!!