Thanks, I will start working on a raspberry pi setup later this evening. Most of the setup guides I have read say 10 miners with a pi. Any tried a pi with say 40 miners?
It is doable, but you need to connect USB hubs in a certain way. You can only have 2 levels of hubs with the Pi, and 10-port hubs than come with the miners already have 2 levels inside them (6+4 ports typically). So you would lose 4 available ports if you daisy-chain those, and you need to connect to the correct ports on the first hub. Use "lsusb -t" to see the USB structure.
AHA!!!! That explains it then! I have 40 miners and when I attached the 4 10-port hubs to a 7-port powered and then to the RaspPi it would only recognize 32 miners (10+10+6+6). If I connected 3 hubs it would only see 26 (10+10+6). So i'm guessing it was able to see a maximum of "levels" and after the first 2 10-port hubs are attached it only sees the first level of any additional hubs.
Do you know of any hubs that keep all the ports on a single level? I already purchased and installed a 2nd RaspPi and have 20 miners on each, but in the future it might be helpful for others that want to control more from a single unit (which I bet it can since 20 miners only results in around 10% utilization).
-Eric