I have a D5100 that I use with the KMTronic relay, and it works just fine on Astroberry or Windows.

Today, I was going through some drawers and found a couple of relay boards I'd bought early on that, at the time, I could not get to work. I think I was using Windows at the time.

Anyway, I thought I'd plug one into the Pi and see if I could maybe get the relay to fire. Not so far. But I've a couple of questions.

1) the relay board showed up as hiddev0 under /dev/usb. But when I attempt to plug in /dev/usb/hiddev0 as the "port", Ekos accepts it but tries to connect to serial port /dev/hiddev0 and fails.
2) Quick and dirty like, I created a link, but it still doesn't trigger the relay. I get his:

2020-12-03T22:57:18: [ERROR] Failed to expose.
2020-12-03T22:56:44: [WARNING] Closing Nikon remote serial shutter failed.
2020-12-03T22:56:43: [WARNING] Opening Nikon remote serial shutter failed.
2020-12-03T22:56:43: [INFO] Starting 1 seconds exposure.

I noticed when I plugged it into Windows 10, the OS saw something out there but could not load a driver. Windows 7 loaded some HID driver, but that was the extent of it - no Comm port. My NUC is Windows 10 so I think if there's any hope, it's with the Pi.

I tried it using gphoto and nikon. I do NOT actually have the other side of the relay connected to the camera (have not made that part of cable yet) - I just want to test the relay communication.

My question really is - am I doing something wrong, or does this sort of relay board still not work?

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