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However, the only way the a really can go into timer mode is if one of the 4 timer registers are actively written to. Is it possible you ran the relay timer example sketch at some point? No never ran the timer sketch - but I am operating in a very noisy environment, so anything could be creeping in...

The easiest option is to do what you suggest and reset the module. Instructions on how to do this are in the quick start guide pdf found at the bottom of the first post. However all you need to do is: 1) With power disconnected from the module, link the two ‘clear’ pads together with a wire or pape...

Firstly, if you have a multimeter can you check the 5V supply to the relay, just in case it's a bit low. It could be that one module is more tolerant. Secondly, if it’s also convenient to do, do the relays switch ok if you control them from the header pins? I have checked the supply and it is healt...

I have a couple of the 2ch mlink relay modules and they where both working fine. I use them to switch the cutter motors in my ESP8266 robotic lawn mowers. They are an excellent fit for this because unlike directly connected relays they don't flicker when the device is started or restarted. They are ...