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Making a baby monitor out of a couple of ESP32s, an I2S microphone, and a small speaker | Splinter Software
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LILYGO® TTGO Microphone Speaker Accessories for T-Call&PMU ESP32 T-Call&SIM800C SIM800C Wireless Module Development Board
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The Complete Guide to Recording an Analog Microphone with ESP32 to an SD card | by Cawin Chan | CodeX | Medium
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