This is before:
This is after:
Would this work?
Do not use the Arduino to power the relay module.
Wire as seen here. (ddloyd)
Oh boy...
This is my very first project so I hired 2 different people on Fiverr and both of their work is incorrect and I'm very confused.
If I may ask just one more question?
I have a slightly different relay module which is 12v (red one) but the person designed the system on this 5v blue one. I don't have a Jumper as seen on the blue one. Where would the positive wire go to?
Many thanks,
Dave
To your 12 V supply...
I asked where the positive wire from the 12v supply would connect on the red relay module?
Do you have a part number for the board?
Maybe it is on the back side?
Or a data sheet?
I guess 12V should be in DC+. But I cannot be sure just looking at a picture. And I would not like you to destroy your board upon my advice.
What makes you think it is a 12V module?
I checked the relay component numbers and they are rated for 5V...
Thank you for asking.
I'm not seeing a model number on the board but this is what is on the Amazon listing:
Specification:
Weight: 60g/2.1oz
Common interface load: AC 250V/10A, DC 30V/10A
Module Size (LWH): 735018.5mm/2.920.7inch
Bolt Hole: 3.1 mm; 67*44.5mm (spacing)
Voltage: 5V, 12V, 24V (Optional)
Module interface:
- DC + : connected to the positive pole of power supply (voltage is required for relay, 5V, 12V and 24V for choice)
- DC- : connect to the power negative pole.
- IN1-IN4: according to the setting of each circuit, the corresponding relay can be controlled with high or low level to suck in.
Relay output terminal: with 12 lines of interfaces, all interfaces can be directly connected to lead, convenient for users to use
- NO1--NO4: the relay normally opens the interface, and the relay is suspended before it is sucked in, and is connected with COM after it is sucked in.
- Common interface of relay COM1--COM4.
- NC1--NC4: relay normally closed interface. The relay is short connected with COM before it is sucked in and suspended after it is sucked in.
High and low level trigger selection terminal:
- S1-S4 is the high-low level trigger selection of relay 1-4 channels successively;
- Com and low short connection, the corresponding relay for low level trigger, com and high short connection for high level trigger.
This is the Amazon listing:
So sorry, I sent the wrong link.
The listing title says: 12V 4 Channel Relay Module with OPTO-Isolated Support High and Low Level Trigger
Also on the board it says 12VDC on top of the big blue box.
this is the one I bought:
I was looking at the previous Amazon listing because it had a better picture of the module but I didn't realize until now that they aren't the same
The blue boxes are the relays...
If they are marked with SRD-12VDC they should be fed with 12V.
Great. The solenoids are 12vdc 500ma and glad to know the relays match up and can power it.
The voltage needed to control your relay (12V) has nothing to do with the voltage of your solenoids. According to your relays you can even switch mains voltage if you like.
From your link it can be seen that 12V should go into DC+.
Thanks. I'll wire it up and post a video of the machine in action.
using relay to drive DC loads seems overkill, why not use MOSFET/BJT for that
matter of fact, you can hack that relay board by getting rid of those blue relay boxes to run your solenoids directly
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Yes, I was going to suggest IRLZ44 or STP36NF06L which are logic-level MOSFETs. Smaller, more efficient, quieter... but you will need to do some soldering.
When I was starting the project another user (will be unnamed) suggested the relays. Sounds like the Mosfet/bjt is the better option...
I feel like Tony Stark building this (it's my first build, ever).
Well, if Tony knew nothing about electrical engineering and was overweight, then yeah, I'm Tony 
You mean there was an option during purchase and you selected 12v?