Prvni ulozeni z chegewara githubu

libraries/I2S/examples/ADCPlotter/ADCPlotter.ino

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+/*
+ This example is only for ESP devices.
+
+ This example demonstrates usage of integrated Digital to Analog Converter (DAC)
+ You can display sound wave from audio device, or just measure voltage.
+
+ To display audio prepare circuit found in following link or drafted as ASCII art
+ https://forum.arduino.cc/index.php?topic=567581.0
+ (!) Note that unlike in the link we are connecting the supply line to 3.3V (not 5V)
+ because ADC can measure only up to around 3V. Anything above 3V will be very inaccurate.
+
+                      ^ +3.3V
+                      |
+                      _
+                     | |10k
+                     |_|
+                      |            | |10uF
+   GPIO34-------------*------------| |----------- line in
+(Default ADC pin)     |           +| |      
+                      |
+                      _
+                     | |10k
+                     |_|
+                      |
+                      |
+                      V GND
+
+Connect hot wire of your audio to Line in and GNd wire of audio cable to common ground (GND)
+
+Second option to measure voltage on trimmer / potentiometer has following connection
+                      ^ +3.3V
+                      |
+                      _
+                     | |
+   GPIO34----------->| |
+(Default ADC pin)    |_|
+                      |
+                      |
+                      _
+                     | | optional resistor
+                     |_|
+                      |
+                      |
+                      V GND
+ Optional resistor will decrease read value.
+
+ Steps to run:
+ 1. Select target board:
+   Tools -> Board -> ESP32 Arduino -> your board
+ 2. Upload sketch
+   Press upload button (arrow in top left corner)
+   When you see in console line like this: "Connecting........_____.....__"
+     On your board press and hold Boot button and press EN button shortly. Now you can release both buttons.
+     You should see lines like this: "Writing at 0x00010000... (12 %)" with rising percentage on each line.
+     If this fails, try the board buttons right after pressing upload button, or reconnect the USB cable.
+ 3. Open plotter
+   Tools -> Serial Plotter
+     Enjoy
+
+Created by Tomas Pilny
+on 17th June 2021
+*/
+
+#include <I2S.h>
+
+void setup() {
+  // Open serial communications and wait for port to open:
+  // A baud rate of 115200 is used instead of 9600 for a faster data rate
+  // on non-native USB ports
+  Serial.begin(115200);
+  while (!Serial) {
+    ; // wait for serial port to connect. Needed for native USB port only
+  }
+
+  // start I2S at 8 kHz with 32-bits per sample
+  if (!I2S.begin(ADC_DAC_MODE, 8000, 16)) {
+    Serial.println("Failed to initialize I2S!");
+    while (1); // do nothing
+  }
+}
+
+void loop() {
+  // read a sample
+  int sample = I2S.read();
+  Serial.println(sample);
+}