5V 8-channel SSR high level trigger module board

Other Hardware 3rd Party Boards
1

I bought the above (DollaTek) board from Amazon to replace an 8-channel solenoid relay board because of the noise. They run a set of programmable disco lights. The problem is.....when I initially created the project, they worked perfectly. I don't use any pull-up or pull-down resistors, I was told I won't need them. After playing with them a couple of times, two of the relays are not firing and the lights won't come on. If I power everything down and leave it for a while and power them up again they sometimes work. On some sequences they work and then gradually begin to fail. If I then change the sequence they begin to work again. It doesn't make any sense. The light comes on with a single a single quick pulse and if there is a short period between firing, the light seems to fail until a different sequence is selected.

I've checked the board temperature, that's OK, I've re-soldered all the the joints and the onboard LEDs all flash at the correct selected sequence. I've also swapped the lights around just in case they are at fault. I don't want to go out and get some 1K resistors if I don't need to.

Any ideas?

2

What is the relay's maximum current rating? How much current does a "disco light" require?

3
  • Give us a link to the PCB.
4

This is the board:-

DollaTek 5V 8-Channel Solid State Relay High Level Trigger SSR Module Board for Arduino ARM DSP PIC With Resistive Fuse: Amazon.co.uk: Business, Industry & Science

5

  • Always show us a good schematic of your proposed circuit.
    Show us good images of your ‘actual’ wiring.

  • In the Arduino IDE, use Ctrl T or CMD T to format your code then copy the complete sketch.
    Use the < CODE / > icon from the ‘posting menu’ to attach the copied sketch.

6

Which Arduino. Don't just say Uno or Nano. We need to know the MCU's working voltage.
What is the load (incandescent, LED).
The sketch, inside code tags, might also help.
Leo..

7

I feel embarrassed to be wasting your time and I do apologise. It was my wiring. I had the 5V supply from a USB supply connected to the Vin. The relay board states that 0-2.5V the relay is ON and 3-5V the relay is OFF. Because I had the 5V connected to the Vin, there was probably a voltage drop at the 5V out and the outputs were close to the threshold causing the relays not to fire. You live and learn :slight_smile: . Thanks for your help anyway. If you want the circuit diagram and the botched sketch then let me know. The lights are controlled by a bluetooth device and a iOS app.

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