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philibertc / micronova_controller

Allows you to easily control via MQTT any Micronova equiped pellet stove. (MCZ, Extraflame, Laminox, and many others brands!)
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Question about 5V Pin #53

Closed eni23 closed 1 year ago

eni23 commented 1 year ago

Hey @philibertc

I have a pellet stove (L'Asolana Marina) which clearly has a Micronova controller board, but i'm unable to access the PCB for interfacing with it. But it has a SUB9 connector on the back with has 3 connected pins (GND,20V,Serial).

I would like your circuit, but the optocoupler that is connected to RX_ENABLE needs 5V which i do not have with the 3P-connection. Since its only driving a optocoupler, i was thinking about using a step-down board and use the 20V to drive this optocoupler. Do you think this will work or is it too dangerous to try it? Any ideas?

I would use a circuit like this: image

The official micronova WIFI board pcb front pcb back also only connects 3 pins and seem to directly convert the 20V down as well.

Thanks in advance :)

philibertc commented 1 year ago

Hello! Using a buck converter to do this is not a problem, you can definitely use this method.

Have a great day, Philibert

eni23 commented 1 year ago

Thanks a lot for your answer. I tried it today and the stove replied and turned on as excepted. I will close here but will create a MR in the next few days to add my model to the supported ones in README.md.

Have a nice day as well :)