You made all those boards! That’s awesome. Nice work.
Interesting choice of PIC24… I used PIC12/16/18 a long time ago but never really looked at PIC24 closely.
I am particularly interested to see that you went to the trouble of emulating exiting Velbus devices so your hardware works with Velbuslink. User matthijsfh did something similar with STM32 a while ago… Thread was here…
https://forum.velbus.eu/t/building-custom-velbus-devices
I had a play with getting several different breadboarded devices monitoring and driving Velbus directly but I guess I never found the right application to take any of it any further. Plus I have to admit I am not very good at finishing things. I thought at the time that emulating existing devices looked like a lot of work though. How much of the vmb4an and vmb4dc commands and responses did you need to replicate to get Velbuslink to work with your hardware? Was it a lot of work?
My setup here is all pretty standard Velbus. Only enhanced bits are a Pi-3 to run velbus-tcp-snap so I can connect over the network and to act as RTC; and a VMB8PBU wired to an arduino UNO as a universal RF-remote receiver.
Thanks for the photos and info. Nice to see another hardware geek in here… Makes me want to have another go… both at the hardware, and at HomeAssistant.