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• #23179 Postas99 őstag Postas99 #23178

  Új Válasz 2024-12-28 12:29:03 #23179

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  /* Audio streamer with ESP32 and Adafruit elected microphone board.
* Created by Julian Schroeter.
*/
#include <Arduino.h>
#include <WiFi.h>
#include <driver/adc.h>

#define AUDIO_BUFFER_MAX 800

uint8_t audioBuffer[AUDIO_BUFFER_MAX];
uint8_t transmitBuffer[AUDIO_BUFFER_MAX];
uint32_t bufferPointer = 0;

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

bool transmitNow = false;

WiFiClient client;

hw_timer_t * timer = NULL; // our timer
portMUX_TYPE timerMux = portMUX_INITIALIZER_UNLOCKED;

void IRAM_ATTR onTimer() {
portENTER_CRITICAL_ISR(&timerMux); // says that we want to run critical code and don't want to be interrupted
int adcVal = adc1_get_voltage(ADC1_CHANNEL_0); // reads the ADC
uint8_t value = map(adcVal, 0 , 4096, 0, 255); // converts the value to 0..255 (8bit)
audioBuffer[bufferPointer] = value; // stores the value
bufferPointer++;

if (bufferPointer == AUDIO_BUFFER_MAX) { // when the buffer is full
bufferPointer = 0;
memcpy(transmitBuffer, audioBuffer, AUDIO_BUFFER_MAX); // copy buffer into a second buffer
transmitNow = true; // sets the value true so we know that we can transmit now
}
portEXIT_CRITICAL_ISR(&timerMux); // says that we have run our critical code
}


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

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

adc1_config_width(ADC_WIDTH_12Bit); // configure the analogue to digital converter
adc1_config_channel_atten(ADC1_CHANNEL_0, ADC_ATTEN_0db); // connects the ADC 1 with channel 0 (GPIO 36)

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

Serial.println("connected to server");

timer = timerBegin(0, 80, true); // 80 Prescaler
timerAttachInterrupt(timer, &onTimer, true); // binds the handling function to our timer
timerAlarmWrite(timer, 125, true);
timerAlarmEnable(timer);

}

void loop() {
if (transmitNow) { // checks if the buffer is full
transmitNow = false;
client.write((const uint8_t *)audioBuffer, sizeof(audioBuffer)); // sending the buffer to our server
}
}

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