While looking for a voice recording module, I found ISD1820 to be one of the cheapest and with good SNR. I am just not sure of the fact that whether each recording from it can be saved to the master (here RPi).
If anyone here already have an experience with the module can share as in how to interface the module so as to save each recording which could be later posted to a server in form of .wav file by the master.
Your help is appreciated!
You can trigger Record and Play from pins described in [1] and printed in board. Audio signal can be saved to .wav with ALSA library [2] and saved to SD card. Then it can be sent as HTTP POST to server.
One issue is that ISD1820 is meant for looping, so you have to manually stop recording when time is 20sec.
[1] https://www.elecfreaks.com/wiki/index.php?title=Voice_Record_Module_-_ISD1820
[2] https://raspberrypi.stackexchange.com/questions/15018/sound-recording-program-using-nano
