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Can Someone Review my Schematic for Android GPIO?

mjones517

Okay, so I want to access Arduino GPIO pins via Android. My plan is to access them via a serial connection using an MCP2200. I can read / write to the serial port on Android, which can then interact with the Arduino.

The problem is I also want to be able to plug in the phone and have it charging while still being able to access the Arduino. I came up with this, but am pretty new to the electronics side of things and want to avoid blowing things up. Will this do what I want?

It's essentially two USB ports. One goes to the charger, the other to the phone. The Arduino and MCP2200 sit in the middle.

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    Today was interesting and I've learned some stuff.

    I decided step 1 was just getting the MCP2200 to register as a serial device. I could not get this to work for the life of me, not even on my laptop. I suspect is correct and I need to add the 12 Mhz crystal. I don't have one, so I can't test for sure.

    Out of frustration I plugged my Arduino directly into my Pixel 6 and opened a serial monitor app. I was able to directly connect, no intermediate chip required. I even got an LED to turn on / off.

    I think the solution I'm going to take is to do that and also buy the USB OTG cable suggested. That will accomplish everything I need to make this project work.

    My last project used a Raspberry Pi. I realized at the end the only thing I needed the Pi for was GPIO, and that the rest of the project would have been cheaper / easier if I could have just used an Android tablet. Now that I know I can control an Arduino using serial commands, I can skip the bloodbath of trying to find / use a Pi.

    Thanks again for everyone's help! As you've figured out I'm a raw newbie.

  • 0 in reply to mjones517

    Thanks for reporting back, . Awesome to hear that you found a solution, that is even more elegant than what we have suggested to you. Getting to blinky is always a huge step. You are less of a newbie now, the bag of experience is filling up. Well done.

    Good luck with your project.

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