I’m integrating a VFD in HA for remote control and am running in to something I have no real knowledge of;
The VFD can either be controlled remotely, or physically. Remote or physical control is set by a jumper (J9, 3 pins, center is common).
I now would like to replace the jumper by something else so I set this from within HA. The most obvious choice would be a relay, but I’m not really charmed by this. It’s bulky and overkill for its task.
I’m sure this can also be done with other electronics, but I lack knowledge on this.
From a relay perspective I’d like to have NC set to the physical jumper setting and NO to remote control (ESP32).
This way the VFD can be controlled physically in case HA dies or the Wifi connection drops.
This snippet is from the manual, maybe it helps.
What I’m looking for is a schematic design for a relay alternative to switch between the 2 possible options set by J9
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For those interested, I’m gonna try the LCC120 MOSFET Relay.
