Lenovo Miix internal USB port for 3G
We did it. Today i was testing around with my friend Ronny where we can get a source to power usb devices on my Lenovo Miix 2. There are various sources around for 3.3VDC. The hurdle was to find a 5VDC source for the USB port. There is no available so far, but the 3.3 Volts are enough to power the most devices made for usb. We tried to connect a 3G USB stick and it was recognized by the lenovo. The pain was it was disconnecting several times when we want to start the connection. There are 2 explanations for this:
1. The source voltage is too low
2. The stick is bad supported
After we treid around different usb devices and we figured out that they seem to work properly. Usb memory, usb wifi stick, usb dvb tv stick and so on.
Tomorrow i will do a video of the stuff to proof the concept. Stay tuned for it.
Further i installed 2 wires for inductive charging the Lenovo. You can see it on the left side the red and black wires. Tomorrow i will order the parts to get this done.
Patrick Zigon – Ich See (Pablo Bolivar Rework)
Searching for DC source
I get a kick back. There is no 5vdc source on the mainboard available. I found various sources for DC 3.7V but I am not sure if this will be enough for a standard 5VDC USB device. Maybe i have to try around with the available voltage supplied by the mainboard. The next thing is it is hard to measure while the mb is off the frame. The pins are really really tiny so the risk of melting something is growing with this hurdle.
Investigation @work for USB voltage
So far I only found pins which are powered up with 5V when the charger is connected. I have to figure out if there are pins also available only in battery mode. For now nothing is melted. Hope to continue without any problems.
Miix and wireless charging
While testing around to find a 5VDC source inside the Lenovo Miix i stumbled above wireless charging. So i will order a Qi-Universal receiver for charging available at amazon LINK. I am sure it will fit in the back of the Miix. The only thing which makes me thoughtful is the aluminium backcase. I hope that it will work even there is only a 500mA source then. For overnight charging i think this will be enough. Additionally i will try to solder the Qi receiver inside the Miix so the USB port will be free for mobile charging.
—Edit—
There are different sources for 3.3V around. Maybe there are USB 3G sticks available which are working with this voltage. This would be the last hurdle to take for a full mobile internet experience with a non 3G version of our Miix
Hunzed & Harvey – Sheeta (Mendo remix)
https://www.youtube.com/watch?v=WabXLgeiL3M
Internal USB @ Lenovo Miix 2-8
Ok guys,
i am on a good way to get a solution for an internal USB-Port. I am quite sure that i found the USB D+ and USB D- pins which will lead to the final goal.
Right now i try to figure out to find a 5VDC source on the mainboard to power the port maybe i have to get this from the micro USB port on the side of the frame.
Stay tuned and press thumbs that I will not melt my beloved device.
