I have a question about relays used by an arduino. I know how to wire them and they work fine for the most of the time.
But sometimes the relays doesn't correctly switch on or off. I can clearly see that the LED on the relay is in the correct state. I can also hear a faint "click" sound. But the relay is not really switching.
Even funnier, then I physically hit/punch the relay with i.e. screwdriver it starts to switch to the desired state...
Usually the problems start when the arduino is running for a few days.
I have also tried completely different relays and have the same issue with them.
Does anybody know what can cause such issues?
- I am using an SRD-05VDC-SL-C relay with an Arduino Nano.
- I have also tried different arduino compatible relays. Same issue.
- I use it to power a light which uses ~250W.
- Usually powering off works fine. But powering on needs a "physical hit" on the box of the relay.
I will try to measure the output tomorrow 7 o'clock when the relay is supposed to switch on again (just before I hit the relay box to force it to switch on)