ISD-1820 audio module

The ISD1820 is an audio module allowing to record and play back audio of ~ 10s duration. Unfortunately the chip does not allow to read out the recorded audio. It is therefore only possible to record when pushing the red REC button and to either play back when a signal edge is detected (PLAYE) or during the time that a level (PLAYL) is detected.

From the programming point of view all you can do is to control the device by program instead of the buttons, which means that you have 3 bits (REC, PLAYE and PLAYL) that you can drive to make the module work. Therefore you can play an audio (e.g. an alarm message) with program control.

-- Uli Raich - 2017-02-14

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