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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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    I am a newbie and reviewed your schematic. I have some points about your project. Correct me if I am wrong:

    The grounds of the MCP2200 (U2) and the Arduino Nano (U1) are properly connected, which is good. But if the USB ports don't share a ground, the phone might have trouble talking to the MCP2200, and it could also have issues charging.
    In any electric circuit, ground (GND) acts like a shared reference for voltages. If the grounds are separated:

    - Serial communication can fail because the signal lines (TX/RX) need a common voltage to function correctly.
    - Powering the phone might be inconsistent or could completely stop working.

    Beside this, Your circuit is well thought out for someone new to electronics, and it should work fine for charging and serial communication. Test the setup with a multimeter to confirm proper voltages and current flow. Slight smile

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  • 0

    I am a newbie and reviewed your schematic. I have some points about your project. Correct me if I am wrong:

    The grounds of the MCP2200 (U2) and the Arduino Nano (U1) are properly connected, which is good. But if the USB ports don't share a ground, the phone might have trouble talking to the MCP2200, and it could also have issues charging.
    In any electric circuit, ground (GND) acts like a shared reference for voltages. If the grounds are separated:

    - Serial communication can fail because the signal lines (TX/RX) need a common voltage to function correctly.
    - Powering the phone might be inconsistent or could completely stop working.

    Beside this, Your circuit is well thought out for someone new to electronics, and it should work fine for charging and serial communication. Test the setup with a multimeter to confirm proper voltages and current flow. Slight smile

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