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Android Tablet - simultaneously charge and USB host using OTG cable

SUMMARY:

I need a custom kernel modification to my android tablet to allow "accessory charging" mode so I can simultaneous charge and act as a USB host using the OTG cable. Standard micro USB OTG cables have pin 4 and 5 shorted, and I think i will need to add a resistor between these pins, but that is not a problem.

BACKGROUND:

I am currently working on a project that requires both continuously powering an Android tablet through micro-USB port and using that same Android tablet as USB host to a smaller hardware device. I researched online to find the USB on-the-go (OTG) cable with pins 4 and 5 shorted out allows the tablet to become a USB host. I have tested my tablet and hardware accessory with this wiring and it will work. However, when I try to add 5V to the USB cable to also charge the Android, the host feature no longer works.

After further investigation I learned that it is possible to do both functions simultaneously if there is a 100k to 125k Ohm resistor added between pins 4 and 5 of teh micro USB cable. I tesetd this with the two different tablets I will be using for thi sproject and neither worked. From what I have read, there are Android kernel modifications required to enable this feature which is called "accessory charging". The purpose of this project is to have an experienced engineer evaluate both the hardware for compatibility and assist me in writing a kernel modification to enable this feature.

HARDWARE:

RCA Voyager 7" tablet

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Yuntab E607 tablet:

https://www.amazon.com/Unlocked-Android-Quad-Core-1024x600-Supported/dp/B01I6AO2HM/ref=sr_1_3?ie=UTF8&qid=1549900339&sr=8-3&keywords=yuntab+E706

Numato Labs USBGPIO8 digital output module:

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Taidot: Android

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Tietoa työnantajasta:
( 0 arvostelua ) West Bridgewater, United States

Projektin tunnus: #18703914

3 freelanceria on tarjonnut keskimäärin %project_bid_stats_avg_sub_26% %project_currencyDetails_sign_sub_27% tähän työhön

Vadimwang

Hi, I’ve carefully gone through your job post. I have more then 8+ years experience in Mobile app development.I am very much interested in your project with all of your requirements. I feel very confident on your pro Lisää

$155 USD 3 päivässä
(12 arvostelua)
5.3
umashankarpandey

Hi there, I’ve read your brief and can see that you’d like to done a project. My team has 8 years experience designing and developing mobile apps for iPhone and Android and web apps. I would approach your project by st Lisää

$155 USD 3 päivässä
(0 arvostelua)
2.5
ThinkStartPL

Hello there, ThinkStartPL is a team of developers, Designers (UI/UX) and project managers with 5+ years experience. I have gone through the job description and We are ready to accept this project and can start work im Lisää

$250 USD 7 päivässä
(0 arvostelua)
0.0