This application note describes how to record, store and play back sound using anyAVR microcontroller with A/D converter, the AT45DB161B DataFlash memory and afew extra components.This application note shows in detail the usage of the A/D Converter for sound record-ing, the Serial Peripheral Interface - SPI - for accessing the external DataFlashmemory and the Pulse Width Modulation - PWM - for playback. Typical applicationsthat would require one or more of these blocks are temperature loggers, telephoneanswering machines, or digital voice recorders.
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