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RELAY ACTUATOR PROBLEM

wilson64 last edited by

I am trying to get my relay actuator to work but no success.
I am using a mqtt gateway with a mqtt client when i publish to the topic MyMQTT/22/1/V_LIGHT payload ON the relay turn on but when i publish MyMQTT/22/1/V_LIGHT payload OFF the nothing happen.
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Hi OSD, thanks for your input. Those are the 4 relays on IO-MCU. I buzzed out the circuit and found that I had an open circuit on the 12v line to the relays. Furthermore 2 of the relays indicator LEDs were illuminating, 2 were not. I suspect, when I first juiced up the circuit on this MCU, the 2 relays fired, but I'd made the trace too thin for the required current. I wired up some jumper wire on the reverse of the PCB and the 2 relays started working. The 2 that remain inoperable? https://forum.arduino.cc/t/using-pins-a6-a7-on-pro-mini-compatible/118050 A6 and A7 can only be analogue inputs, cannot be digitally written to..... - so this part of my PCB is now redundant. However, all in all, some good fault finding, found the two issues, and I'm now going away to re-think my PCB trace widths and reading the datasheets more accurately Thanks
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Hi all, Should anyone face the same problem, I found the root cause: brownout threshold. I burned a new bootloader (Optiboot 8.0) without such trigger and the node has been working with used batteries (~2.7V) since May. Hope this helps.

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