Julian Frederic Schroeter
Published © GPL3+

Stream Your Audio on the ESP32

Use the ESP32 to play audio data from a custom stream.

IntermediateFull instructions provided1 hour9,575
Stream Your Audio on the ESP32

Things used in this project

Hardware components

Speaker: 3W, 4 ohms
Speaker: 3W, 4 ohms
×1
ESP32S
Everything ESP ESP32S
I really recommend using an ESP32 Developer Board from your favourite brand
×1
Solderless Breadboard Full Size
Solderless Breadboard Full Size
×1
Jumper wires (generic)
Jumper wires (generic)
×1
Adafruit Stereo 3.7W Class D Audio Amplifier - MAX98306
×1

Software apps and online services

Arduino IDE
Arduino IDE
with the esp32 core from espressif
Java
Audacity

Story

Read more

Schematics

Schematics

Bildschirmfoto 2018 03 05 um 13 36 24 zqe0iialvg

Code

esp32_java_voice_server.ino

Arduino
#include <Arduino.h>
#include <WiFi.h>
#include <driver/dac.h>

const char* ssid     = "YOUR SSID";
const char* password = "YOUR PASSWORD";
const char* host     = "YOUR SERVER IP ADDRESS"; 

WiFiClient client;

hw_timer_t * timer = NULL; 
portMUX_TYPE timerMux = portMUX_INITIALIZER_UNLOCKED; 

#define BUFFFERMAX 8000

uint8_t dataBuffer[BUFFFERMAX];
int readPointer = 0, writePointer = 1;

bool play = false;

void IRAM_ATTR onTimer() {
  portENTER_CRITICAL_ISR(&timerMux);
  
  // play data: 
  if (play) {
    dac_output_voltage(DAC_CHANNEL_1, dataBuffer[readPointer]);

    readPointer++;
    if (readPointer == BUFFFERMAX) {
      readPointer = 0;
    }

    if ( getAbstand() == 0 ) {
      Serial.println("Buffer underrun!!!");
      play = false;
    }
  }


  portEXIT_CRITICAL_ISR(&timerMux);
}

int getAbstand() {
  int abstand = 0;
  if (readPointer < writePointer ) abstand =  BUFFFERMAX - writePointer + readPointer;
  else if (readPointer > writePointer ) abstand = readPointer - writePointer;
  return abstand;
}

void setup() {
  Serial.begin(115200);

  dac_output_enable(DAC_CHANNEL_1);
  pinMode(33, INPUT_PULLUP);
  pinMode(32, INPUT_PULLUP);

  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());


  const int port = 4444;
  while (!client.connect(host, port)) {
    Serial.println("connection failed");
    delay(1000);
  }

  timer = timerBegin(0, 2, true); // use a prescaler of 2
  timerAttachInterrupt(timer, &onTimer, true);
  timerAlarmWrite(timer, 5000, true);
  timerAlarmEnable(timer);


}

void loop() {
  int abstand = getAbstand();
  if (abstand <= 800) play = true;

  if ( abstand >= 800) {
    client.write( B11111111 ); // send the command to send new data
    
    // read new data: 
    while (client.available() == 0);
    while (client.available() >= 1) {
      uint8_t value = client.read();
      dataBuffer[writePointer] = value;
      writePointer++;
      if (writePointer == BUFFFERMAX) writePointer = 0;
    }

  }

}

Voice_Server.jar

Java
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demo.raw

Plain text
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Credits

Julian Frederic Schroeter

Julian Frederic Schroeter

2 projects • 9 followers

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