4 Channel Relay

Other Hardware Motors, Mechanics, Power and CNC
1

I love this forum, I have done 2 other posts and both times solved it.

I have a 4 channel relay that I can figure out what im doing wrong, it works when powered directly from the Arduino 5v pin, the relays lights flash as they should but they dont engage, I guess because the power from the 5v pin is so low.

My Problem is when all i change is 5v power from an external source, instead of the Arduino, nothing happens, no relay lights at all.

Im at a loss, I think maybe its not earthed properly?

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2

i see no solved topic in your profile.

connect GND of power source to arduino GND.
show image of your module and photo of your setup.

3

Do your external 5 volt supply and your Arduino share common ground? They should. This is merely a start point. I clicked later than kolaha. :slight_smile:

Ron

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5

Sorry my bad, im new to forums, Ill fix that.

Yes joining the ground worked, thank you :smiley:
I still just have lights on the relays and no relay click.
The external power source is 5v, should it be higher?

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The power supply to the relay board is 5v and the power to the relays is 12v

7

Thanks Ron,
Thought that was it

8

Alrighty then. :slight_smile: In all fairness kolaha did click first suggesting the same as I suggested.

Ron

9

Thanks,

Joining the earths half fixed it, the relays flash now but dont click?
i thought maybe the input voltage in the relay board is to low?

10

The tops look like they are 12V relays.
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supplier provide no schematic of this module. you need to reverse engineer it.

12

Yea i was under the impression that it needed 5v to activate the relay

Might wind up the power supply and see what 12v does

13

Yea its hard to find any information on it

14

fixed it... 12v to the input pin on the relay board

Thanks :smiley:

15

Yay! That takes care of that. :slight_smile:

Just as a side note on these relay boards. Most use the Songle manufactured relays in a range of coil voltages and current.

The 5 volt coil versions have a resistance of about 70 Ohms and coil current of 71 mA. A board with 4 relays all energized will draw upwards of 300 mA for coil current.

When buying these boards always check the coil voltage first to make sure you get what you want/need. Make sure you have a supply to support the needed current allowing for some overhead.

Ron

Ron

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