Thank you for the reply Kit. I have relay one on the expansion connected inline to power and to a light fixture. I can toggle the light on and off via the relay now. I would like to be able to set a schedule for the relay to turn the light on for two hours in the morning and two hours at night. I live in alaska and i need to augment some daylight for the flock. I will look at cron and crontab

Is it possible to set a schedule for the relay expansion? I set up my onion with a usb web cam and a relay to control a light in my chicken coop and would like to schedule the light.

I had this same issue. I found that a mac or pc could detect the onion but the virtual port would not appear when i used a USB cable less than 12" in length.