2 channel relay module doesn't work properly

I am trying to use 2 channel relay module. with one channel relay, there is no problem, but with 2 channels it doesn't work properly. After working some while whether pneumatic valves start blinking(works and stops) or the ar4 software stops working.

I tried 5 channel relay module and try to use 2 different relay module separately as well.

Any idea?

pneumatic valves wired with 24v. signals go 5v via arduino.

4 comments

Comments (4)

Orçun Oruç Aykaç

Mar 20, 2023

The problem occurs when I try to feed two relays by one power adapter. When I feed each device, which connected to relays, by different power adapter, no problem occurs.

Consequently, I solved the problem by using two different power adapters.

Please help if someone finds a way using by one adapter.

Orçun Oruç Aykaç

Mar 18, 2023

I realized that the problem based on USB plug of arduino. When I feed arduino(I tried on arduino UNO and MEGA ) via an extarnal 5v adapter and UNPLUG usb cable, 2 relay works well. When I change it to USB plug again, it does work unstable.

I can use external adapter it to work properly. But how can I send command if I don't use USB cable? I can't send data via AR4 software.

Johann Voigtlander

Mar 19, 2023

Replying to

Check your USB cable can send data + power. A lot of cheap cables are only for power (like charging a phone).

Orçun Oruç Aykaç

Mar 20, 2023

Replying to

Thanks Johann. I checked USB cable. It works and gives 5v correctly.

When I plug power supply, which I use also for motors, to 2 channel relay module and power, it doesn't work stable: It works and syops after a while. I think the problem may be about GND. BTW: I use 2 channel at the same time.

I think using Arduino and relay module might not be stable way. :/

ANNIN ROBOTICS

2 channel relay module doesn't work properly