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A RETAIL SOLUTION THAT ALLOWS USER INTERACTION

The purpose of the system is to play demo music files on a multiple speakers audio system via an Android Application in a retail environment. The system includes an audio controller which is connected to a Android device through Android Open Accessory Protocol.

Design challenges:

        - System Reliability
        - Design reliable communication protocol to Android device
        - Hi-FI Audio Quality
        - Communication to Android device over USB Real-time Audio Stream to multiple devices Reliable System Testing

System structure:


The system's key components:

        - STM32F105 ARM® CortexT - M Microcontroller
        - Analog Device DSP
        - Android USB Open Accessory Mode Interface
        - I²C Audio Multiplexer
        - SPI Communication






As with many elegant solutions, this system's simple user interface belies its complexity.

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