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OLD POST - HOW I STARTED
Firstly hi all
Secondly i want describe myself as a person who has only little knowledge about electronics etc. Also i am very busy at work and at home after work with kids, so to be honest with you i can test it only while i am actually working ( i do Testing and servicing medical devices )
At this moment i can't "afford" to buy SONY ERICSSON LIVEdock ( OTG MODE + CHARGING AT THE SAME TIME )
I just want to share my progress in making cheaper verision of LIVEdock, also i looking fore some smart arse to help me/us finish what i started,
I know this is little bit messy and don't kill me for my english please
I made simple OTG CABLE with permanently shorted PIN 4 (sense) AND 5 (ground) on my microUSB. The i realized that phone battery must support power for phone and connected USB device such as keyboard, mouse, gamepad etc. Then i added ON/OFF switch between PIN 4 and 5 what i achieved ?
Now i can switch between OTG MODE and CHARGING MODE ( unfortunately both modes wouldn't work at the same time ). Then i added another two ON/OFF switches to cut off the power from the battery VCC (red wire) and GROUND (black) while you are in OTG MODE. I added another USB cable ( this one suply power from computer or charger or car charger ) but i used VCC and GROUND only i connected these wires to each switches and FEMALE USB ( one you connect keyboard ,gamepad etc ). What i achieved ? now Battery support only my phone but phone is still in OTG mode, and whole power goes to our device ( Keyboard, USB flash memory etc ) .
Now we know how to get external power source to our external device , but i still haven't find an solution how to get phone in charging mode or to do anything to prevent phone from discharging while we are in OTG MODE . I know that SONY instead of so many switches used just some simple electronics components. Also i still haven't try everything but if you have any idea please let me know.
Later on i will upload Video on YouTube ( HOW IT WORKS )