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libraries/audio-tools/examples/examples-communication/http-server/streams-i2s-webserver_wav/README.md

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+# I2S to Webserver
+
+This sketch reads sound data from I2S. The result is provided as WAV stream which can be listened to in a Web Browser
+
+![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 the left channel of the I²S frame.
+        When the high level is set, the microphone will send signals on the right channel.
+- ExSD: Serial data output of the I²S interface
+- VCC: input power 1.8V to 3.3V
+- GND: Power groundHigh PSR: -75 dBFS.
+
+

libraries/audio-tools/examples/examples-communication/http-server/streams-i2s-webserver_wav/streams-i2s-webserver_wav.ino

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+/**
+ * @file streams-i2s-webserver_wav.ino
+ *
+ *  This sketch reads sound data from I2S. The result is provided as WAV stream which can be listened to in a Web Browser
+ *
+ * @author Phil Schatzmann
+ * @copyright GPLv3
+ */
+
+#include "AudioTools.h"
+#include "AudioTools/Communication/AudioHttp.h"
+
+//AudioEncodedServer server(new WAVEncoder(),"ssid","password");  
+AudioWAVServer server("ssid","password"); // the same a above
+
+I2SStream i2sStream;    // Access I2S as stream
+ConverterFillLeftAndRight<int16_t> filler(LeftIsEmpty); // fill both channels - or change to RightIsEmpty
+
+void setup(){
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);
+
+  // start i2s input with default configuration
+  Serial.println("starting I2S...");
+  auto config = i2sStream.defaultConfig(RX_MODE);
+  config.i2s_format = I2S_STD_FORMAT; // if quality is bad change to I2S_LSB_FORMAT https://github.com/pschatzmann/arduino-audio-tools/issues/23
+  config.sample_rate = 22050;
+  config.channels = 2;
+  config.bits_per_sample = 16;
+  i2sStream.begin(config);
+  Serial.println("I2S started");
+
+  // start data sink
+  server.begin(i2sStream, config, &filler);
+}
+
+// Arduino loop  
+void loop() {
+  // Handle new connections
+  server.copy();  
+}