Hello :slight_smile: So I would like to buy this 12V relay board and connect it to the Arduino Mega (with two, daisy chained 74HC595 shift registers): [image] Can someone simply please take a look at these schematics , and tell me what are those two 5V and two GND pins for? I asked Sainsmart abou…

What are those pins for...?

Topic		Replies	Views
Bought a 4 relays optocoupler board...but strange schematics.. Home Automation	6	5949	May 6, 2021
12V 16 relay board powering General Electronics	9	2342	May 6, 2021
Powering up my 16ch 5v Relay shield General Guidance	13	6706	May 5, 2021
I could use help understanding this relay board General Guidance	7	4428	May 5, 2021
8 Channel Relay Board - Proofreading Product Design	46	37714	May 6, 2021