The heart of the circuit consists of the integrated MCP2221A produced by Microchip . This integrated is cataloged as USB 2.0 to I2C / UART Protocol Converter with GPIO or a protocol converter from USB to UART and I2C with IO having customizable functions.
You can use it as a bare Serial (only RX and TX) to USB converter such as the adapters based on FT232R, CH340G, PL2303, but have also some functions extra: it can act as Master on an I2C bus and there is also an Android Application with source code for this! You can read the documentation following the link in this project.
I've made also some video tutorials showing the usage of android app for I2C and UART communication:
Bill of materials used in this project
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