Our device is already quite old, but as a navigator or a video monitor in the car, he is able to perform its wonderful functions.
I wanted to make it work in the USB-Host mode and simultaneously charge current of 1-1.5 A. I tried different schemes, firmware, kernel.
That scheme, which allows the USB-Host and full charge at the same time.
Simple version:
Complicated:
I used a reed relay type 2A and 1C.
After power on, 3pin and 4pin Samsung 30pin connector via resistors 33kOhm and 10kOhm are closed on the + 5V and the Gnd, the tablet starts full charging.
Push the button, self-locking relay K1, as well as closes 13pin through 20 kOhm resistor to the 15pin. Relays K2 and K3 switch 3pin and 4pin Samsung connector to 3pin and 2pin USB.
If the power is turned off relays K1, K2 and K3 are opened and the next occurrence of the power tab becomes full charge mode.
Capacitor C1 0,03F will delay the opening of the switch for 3-4 seconds, and allow time to safely remove the USB drive (Tasker: power on, usb drive on <- script / run shell / command: service call mount 7 s16 /mnt/sdcard/extStorages/UsbDriveA).
I wanted to make it work in the USB-Host mode and simultaneously charge current of 1-1.5 A. I tried different schemes, firmware, kernel.
That scheme, which allows the USB-Host and full charge at the same time.
Simple version:
Complicated:
I used a reed relay type 2A and 1C.
After power on, 3pin and 4pin Samsung 30pin connector via resistors 33kOhm and 10kOhm are closed on the + 5V and the Gnd, the tablet starts full charging.
Push the button, self-locking relay K1, as well as closes 13pin through 20 kOhm resistor to the 15pin. Relays K2 and K3 switch 3pin and 4pin Samsung connector to 3pin and 2pin USB.
If the power is turned off relays K1, K2 and K3 are opened and the next occurrence of the power tab becomes full charge mode.
Capacitor C1 0,03F will delay the opening of the switch for 3-4 seconds, and allow time to safely remove the USB drive (Tasker: power on, usb drive on <- script / run shell / command: service call mount 7 s16 /mnt/sdcard/extStorages/UsbDriveA).
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