I recently discovered that the dock connector on the Thinkpad X1 tablet Gen 3 uses USB for the keyboard on the POGO pins, I want to use that connector to add a USB 2.0 hub to my tablet case (lenovo medical case for the X1 tablet)
Can't find much info on that bit online, but found lots of info for converting the Keyboards to USB. I wired up a USB port following https://sharktastica.co.uk/resources/im ... ogo-6p.jpg
If i connect a 10K resistor between ground/pin1 and pin5 (NC) i get a USB ding and then i see voltage on the 5V pin, but it drops to 2-3V when i plug in a flash drive and windows gives me a "USB device not recognized". but... if i supply external 5V to the flash drive, with the power disconnected from the tablet 5v pin, the tablet recognized and mounts the flash drive. there's gotta be a way to keep the USB pin voltage stable. unless it's going overcurrent trying to run a flash drive...
Dunno if anyone has done what i am trying to attempt before. Basically, need to somehow trick the tablet into thinking a keyboard is attatched, so i can activate and use the USB port without an external power supply on the USB.
Can't find much info on that bit online, but found lots of info for converting the Keyboards to USB. I wired up a USB port following https://sharktastica.co.uk/resources/im ... ogo-6p.jpg
If i connect a 10K resistor between ground/pin1 and pin5 (NC) i get a USB ding and then i see voltage on the 5V pin, but it drops to 2-3V when i plug in a flash drive and windows gives me a "USB device not recognized". but... if i supply external 5V to the flash drive, with the power disconnected from the tablet 5v pin, the tablet recognized and mounts the flash drive. there's gotta be a way to keep the USB pin voltage stable. unless it's going overcurrent trying to run a flash drive...
Dunno if anyone has done what i am trying to attempt before. Basically, need to somehow trick the tablet into thinking a keyboard is attatched, so i can activate and use the USB port without an external power supply on the USB.
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