Austroteen
Member
Hi Teensy team:
I am using a Teensy 4.1 and the USB-Host port to control a photo-camera.
All software works fine but now I remembered that the camera uses the USB plug to charge its battery, when its turned off.
I powered the teensy via its USB by an USB charger and power meter and connected the camera to the USB Host pins on the board.
In "working" mode ( camera turned on ) powerdissipation is ~110mA to 130mA.
3 seconds after turning the camrea off, powerdissipation turns up to ~550mA, this tells me that the camreas battery is charged through USB host port of the teensy.
so some questions:
- how much current can be drawn on the USB host for a longer time (hours) without getting heat problems.
- is there a way to limit current? else the USB-or teensy port might be damaged.
thanks in advance!
I am using a Teensy 4.1 and the USB-Host port to control a photo-camera.
All software works fine but now I remembered that the camera uses the USB plug to charge its battery, when its turned off.
I powered the teensy via its USB by an USB charger and power meter and connected the camera to the USB Host pins on the board.
In "working" mode ( camera turned on ) powerdissipation is ~110mA to 130mA.
3 seconds after turning the camrea off, powerdissipation turns up to ~550mA, this tells me that the camreas battery is charged through USB host port of the teensy.
so some questions:
- how much current can be drawn on the USB host for a longer time (hours) without getting heat problems.
- is there a way to limit current? else the USB-or teensy port might be damaged.
thanks in advance!