8 channel relay modules

Hardware
1

Hello friends.I am making a home automation project and i have connected 3x8channels ralay modules to arduino mega. Everything is working fine until i turn on too many relays and the arduino power is not enough to turn them on at the same time. I know that i have to plug an external power source to my relay modules but my modules are missing the jd-vcc pins and i am very confused about how to wire them with external power source

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20220510_165320
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Here are some photos of my modules.
The question is how to connect external power supply to this type of relay modules?

2

NEVER power relays, motors, etc. from an Arduino. Always power from an external supply connected just like you connected the Arduino to the modules.

3

So whats the proper way of connecting the modules

4

The external supply POWERS the modules. The Arduino CONTROLS the modules. Perhaps a link to the actual modules would help.

5

VCC from the relay module should go to an ideal power supply
GND from relay module to GND of the power supply
GND of Arduino to GND of the relay module
should do

6

Looks like the red Keyes 8-Relay Module. This module seems to use high-level trigger, which would explain the pinout and jumper.

From another link on the forum I've modified a connection image slightly to show connections using an external 5V supply and using opto-isolation:

  • Remove jumper.
  • COM to Arduino GND.
  • Do not connect Relay board GND to Arduino GND or opto isolation will be lost.
    image
    image807×768 52.8 KB
1 Like
7

What is this mysterious "Arduino power"?

I do hope you are not attempting to use "Vin" or the "barrel jack" for a serious project. :face_with_raised_eyebrow:

Just the opposite (in polarity) of the common low-level trigger modules. :grin:

8

You are the best worked like charm

9

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