connected to a compute unit, I find that device does not charge reliably if capture mode was switched to livestream(without actually streaming). On connection, the icon of the top right shows a charging battery for a few seconds, then switches back to a non-charging battery icon after a few seconds.
I have verified that in this setting the battery does drain and it’s not a UI quirk.
This only happens on livestream mode, tested on latest 1.40 firmware. This makes me wonder if the device draws any charge at all while live streaming. I would expect it to.
I checked the video you attached and I can see the power level was 79% when video started and at 0:40 it popped up to 80% charge level… I noticed that it stopped charging right after.
Did you connect it to a 3.0 (or greater) USB port on a PC? Did you use an appropriate 3.0 (or above) USB cable?
I’m not sure about Theta X, but as it’s android based, there may be a setting to switch on or off “optimize for battery health”, which usually stops charging devices at 80%… not sure if this is set by default, or in theory it could stop charging also if it’s too hot. Try with another cable and port please.
hello, yes, a usb 3.0 cable is used. the same physical set up has been used to charge the device to 100% in still image capture modes and video modes. so I don’t see why livestream mode should be an exception
live stream mode requires more power than still image and may require more power than video mode. If you attach an in-line current meter to the camera during charging, you can measure the current during the various modes.
In video mode, you’re not running the video 24/7. You’re likely turning it on and off, allowing the camera some time to charge before video shoots. In live streaming, I awa a constant draw of around .6 to 0.9 amps in my tests.
In this thread, I saw voltage of 9V going into the camera.
The USB 3.0 ports on the Jetson Nano and Raspberry Pi did not supply enough electrical current in my tests.
hi craig, we measured the current draw while switching between modes. note that we did not actually start the live stream in these tests. when we switch to livestream, the device draws some current, then drops to nothing after a few seconds. do we have a faulty device on our hands?
I’m using a upboard specifically in that video, and I’ve replicated the issue on various PCs and laptops with ubuntu running(I’ll update once I get my hands on an xavier). it does not seem to be in issue with a windows laptop I tried, I don’t have easy access to a Mac right now. switching away from ubuntu is not an option for us.
For the Jetson, I had to disable automount to use the USB API. I have not tested this with live streaming recently. I am using Jetpack 4.6, based on Ubuntu 18.04. I’ll try and do more tests with live streaming.
Hi craig, wondering if you managed to replicate the lack of charging issue without mounting/gvfs on linux machines. I speculate it’s a firmware issue on the theta X and I wanted to know if it’s an issue on the Z1 as well
thanks @craig for your tests, looks like we get abit more current in fw1.41 from your tests.
we’re working on getting an order placed for a Z1, but since the local supplier doesn’t have ready stock, it might be a while before we get our hands on one
You may be able to continue your research and development with a Linux computer that has a USB-C port on it. The key specification may be “Power Delivery”. I’m not sure how to tell if a USB-C port has Power Delivery (PD) or not.
For the V and Z1, “Battery Charging” (BC) 1.2 was sufficient.
The power specifications of BC 1.2 (and thus most USB 3.0 type A ports) is much lower than the Power Delivery specifications.
In my tests, the input voltage going into the THETA X is above 5V. It goes up to 9V.
Based on informal discussions with people that have knowledge of the THETA X, the input power requirement seems to be 18W.