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OpenBot
OpenBot leverages smartphones as brains for low-cost robots. We have designed a small electric vehicle that costs about $50 and serves as a robot body. Our software stack for Android smartphones supports advanced robotics workloads such as person following and real-time autonomous navigation.
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Perhaps this is what you're looking for? https://www.openbot.org/
To put it in short, underneath Android is Linux, but most phone makers remove or disable the typical USB to Serial drivers, which is used for most iot extension boards. There is no official support from Android for this at this point. You can either directly use the UsbManager APIs to communicate with the robot, or use an opensource library like this one, which uses Android's UsbManager APIs to implement the serial driver.