Can anybody confirm wether a cooled qhy cam (294 or similar, mono preferably, since it has also to feed the cfw) can be powered directly from a usb3 port of a rpi4? (apart of the dedicated 12v power supply). I'm not sure if I would need a powered hub. I would like not to use it.
Maybe you are asking if you can control the camera over USB if you power it with 12v DC? Then the answer is yes, but it's not power being transmitted by the USB. The USB port is for signals, not power.
Thanks for the reply.
I think the camera can be powered over usb. Only the camera itself, not the cooler. In the same way that for example my qhy guide cam only works connected via usb (no cooler stage, of course), In fact I have read that qhy 294 (this is the particular model I am interested in) may work via usb, but it seems can make the rpi unstable, hence my question.
Not exactly the same model, but I'm currently running an ASI120MM-S and an ASI533MC from a Raspi4 without using any powered USB hub. Obviously, the cooler for the ASI533MC is running from an external source (in my case, a powerbank with a booster from 5v to 12v)
QHY uses the power to also reset the camera, this is if you are doing remote setups, when you power cycle the 12V connection, it resets the camera CPU. Thus that's why the camera does not normally work without the 12V line.
Yes, I have connected my focuser (ASI EAF/Pegasus FocusCube), Guidingcam (ASI290mini) dirctly at the Raspi, and via an unpowered USB hub an SSD and the mount (EQ6R). Focuser and guiding cam are connected via the two USB2 ports, the QHY to one of the USB3 and the hub on the other USB3 port.
I use this setup for almost a year with no problems.
P.S.: for completeness: The focuser have to be connected to 12V seperatly, also of course the EQ6R.
That sounds fantastic, Jürgen. My setup is similar. I currently have the rpi4 with the following devices: an autofocuser (yes, also with an independent power supply), a qhy guide cam, the mount (eq6r pro) and my current dslr, which hopefully would be replaced by the new qhy 294m pro.
Thanks for your help!