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libraries/audio-tools/examples/examples-communication/a2dp/basic-i2s-a2dp/README.md

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+# Stream I2S Input to A2DP Bluetooth
+
+## General Description:
+We implement a A2DP source: We stream the sound input which we read in from the I2S interface to a A2DP sink. We can use any device which provides the sound data via I2S. In order to test the functionality we use the INMP441 microphone.
+
+![INMP441](https://pschatzmann.github.io/Resources/img/inmp441.jpeg)
+
+The INMP441 is a high-performance, low power, digital-output, omnidirectional MEMS microphone with a bottom port. The complete INMP441 solution consists of a MEMS sensor, signal conditioning, an analog-to-digital converter, anti-aliasing filters, power management, and an industry-standard 24-bit I²S interface. The I²S interface allows the INMP441 to connect directly to digital processors, such as DSPs and microcontrollers, without the need for an audio codec in the system.
+
+## Pins
+ 
+| INMP441 |  ESP32
+| --------| ---------------
+| VDD     |  3.3
+| GND     |  GND
+| SD      |  IN (GPIO32)
+| L/R     |  GND
+| WS      |  WS (GPIO15)
+| SCK     |  BCK (GPIO14)
+
+
+SCK: Serial data clock for I²S interface
+WS: Select serial data words for the I²S interface
+L/R: Left / right channel selection
+        When set to low, the microphone emits signals on one channel of the I²S frame.
+        When the high level is set, the microphone will send signals on the other channel.
+ExSD: Serial data output of the I²S interface
+VCC: input power 1.8V to 3.3V
+GND: Power groundHigh PSR: -75 dBFS.
+
+### Dependencies
+
+- https://github.com/pschatzmann/ESP32-A2DP.git
+