tliero
Published © GPL3+

WiFi Doorbell with ESP32 and DFPlayer

A doorbell that is triggered via WiFi by a remote microcontroller.

IntermediateFull instructions provided3,307
WiFi Doorbell with ESP32 and DFPlayer

Things used in this project

Hardware components

ESP32S
Espressif ESP32S
×2
DFRobot dfplayer
×1
Resistor 1k ohm
Resistor 1k ohm
×2
LED (generic)
LED (generic)
Should operate on 3.3 V
×2
Pushbutton switch 12mm
SparkFun Pushbutton switch 12mm
×1
2×8 cm PCB
×2

Hand tools and fabrication machines

Soldering iron (generic)
Soldering iron (generic)
3D Printer (generic)
3D Printer (generic)

Story

Read more

Custom parts and enclosures

Sender Case

Speaker Case

Schematics

Doorbell Sender

Doorbell Speaker

Code

Sender Code

Arduino
/*
 * Sources:
 * https://www.arduino.cc/en/Tutorial/Button
 * https://techtutorialsx.com/2017/05/19/esp32-http-get-requests/
 */

#include <WiFi.h>
#include <HTTPClient.h>
 
const char* ssid     = "WiFi SSID";
const char* password = "WiFi password";
const char* bellUrl = "http://192.168.1.149/bell/on";

const int buttonPin = 21;    // the number of the pushbutton pin
const int ledPin =  23;      // the number of the LED pin
int buttonState = 0;

 
void setup() {

  Serial.begin(115200);
  btStop(); // turn off bluetooth

  pinMode(ledPin, OUTPUT);
  pinMode(buttonPin, INPUT);

  connectWifi();

}
 
void loop() {
 
  if ((WiFi.status() == WL_CONNECTED)) {

    buttonState = digitalRead(buttonPin);
    delay(100);

    if (buttonState == HIGH) {
      digitalWrite(ledPin, HIGH);
      
      HTTPClient http;
   
      http.begin(bellUrl);
      Serial.print("GET ");
      Serial.println(bellUrl);
      int httpCode = http.GET();
   
      if (httpCode > 0) {
          //String payload = http.getString();
          Serial.println(httpCode);
          //Serial.println(payload);
        }
      else {
        Serial.println("Error on HTTP request");
      }
   
      http.end();
      delay(200);
    }
    else {
      digitalWrite(ledPin, LOW); 
    }
  }
  else {
    Serial.println("WiFi not connected!");
    digitalWrite(ledPin, HIGH);
    delay(200);
    digitalWrite(ledPin, LOW);
    delay(50);
    digitalWrite(ledPin, HIGH);
    delay(200);
    digitalWrite(ledPin, LOW);
    connectWifi();
  }
 
}

void connectWifi() {
  boolean ledStatus = false;
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
    ledStatus = !ledStatus;
    digitalWrite(ledPin, ledStatus);
  }
 
  Serial.println("WiFi connected.");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

Speaker Code

Arduino
/*
Sources:
https://www.youtube.com/watch?v=kq2RLz65_w0
https://www.dfrobot.com/wiki/index.php/DFPlayer_Mini_SKU:DFR0299
https://github.com/pcbreflux/espressif/blob/master/esp32/arduino/sketchbook/ESP32_DFPlayer_full/ESP32_DFPlayer_full.ino
https://github.com/pcbreflux/espressif/blob/master/esp32/arduino/sketchbook/ESP32_DFPlayer_full/setup.png
https://randomnerdtutorials.com/esp32-web-server-arduino-ide/
*/

#include <Arduino.h>
#include "DFRobotDFPlayerMini.h"
#include <WiFi.h>

HardwareSerial hwSerial(1);
DFRobotDFPlayerMini dfPlayer;
int volume = 5;

const char* ssid     = "WiFi SSID";
const char* password = "WiFi password";
WiFiServer server(80); // Set web server port number to 80

String header;
String ledState = "";
const int ledPin = 26;

unsigned long timestamp = 0;


void setup()
{
  btStop(); // turn off bluetooth
  hwSerial.begin(9600, SERIAL_8N1, 18, 19);  // speed, type, TX, RX
  Serial.begin(115200);

// WiFi & LED ==================================================================
  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, LOW);

  // Connect to Wi-Fi network with SSID and password
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  // Print local IP address and start web server
  Serial.println("");
  Serial.println("WiFi connected.");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
  server.begin();
  delay(500);

  dfPlayer.begin(hwSerial);  //Use softwareSerial to communicate with mp3
  dfPlayer.setTimeOut(500); //Set serial communication time out 500ms
  dfPlayer.volume(volume);  //Set volume value (0~30).
  dfPlayer.EQ(DFPLAYER_EQ_NORMAL);
  dfPlayer.outputDevice(DFPLAYER_DEVICE_SD);
  
  ledState = "on";
  digitalWrite(ledPin, HIGH);
  timestamp = millis();
  dfPlayer.play(1);  //Play the first mp3

}

void loop() {

  WiFiClient client = server.available();   // Listen for incoming clients

  if (ledState == "on" && (millis() - timestamp) > 2000) {
    ledState = "off";
    digitalWrite(ledPin, LOW);
  }

  if (client) {
    String currentLine = "";                // make a String to hold incoming data from the client
    while (client.connected()) {            // loop while the client's connected
      if (client.available()) {             // if there's bytes to read from the client,
        char c = client.read();             // read a byte, then
        Serial.write(c);                    // print it out the serial monitor
        header += c;
        if (c == '\n') {                    // if the byte is a newline character
          // if the current line is blank, you got two newline characters in a row.
          // that's the end of the client HTTP request, so send a response:
          if (currentLine.length() == 0) {
            // HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
            // and a content-type so the client knows what's coming, then a blank line:
            client.println("HTTP/1.1 200 OK");
            client.println("Content-type:text/html");
            client.println("Connection: close");
            client.println();
            
            // turns the GPIOs on and off
            if (header.indexOf("GET /bell/on") >= 0) {
              ledState = "on";
              digitalWrite(ledPin, HIGH);
              timestamp = millis();
              dfPlayer.play(1);  //Play the first mp3
            }
            else  if (header.indexOf("GET /volume/") >= 0) { // yes, I know this is not RESTful
              String str1 = header;
              str1 = str1.substring(header.indexOf("GET /volume/") + 12);
              volume = str1.substring(0, str1.indexOf(" ")).toInt();
              
              if (volume < 0) {
                volume = 0;
              }
              else if (volume > 30) {
                volume = 30;
              }
              
              dfPlayer.volume(volume);
              Serial.print("volume set to ");
              Serial.println(volume);
            }
            
            // Display the HTML web page
            client.println("<!DOCTYPE html><html>");
            client.println("<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");
            client.println("<link rel=\"icon\" href=\"data:,\">");
            client.println("<style>html { font-family: sans-serif; display: inline-block; margin: 0px auto; text-align: center; }");
            client.println(".button { background-color: #4CAF50; border: none; color: white; padding: 16px 40px; text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;}");
            client.println(".button2 { background-color: #4CAF50; border: none; color: white; padding: 4px 10px; text-decoration: none; margin: 1px; cursor: pointer;}</style></head>");
            
            client.println("<body><h1>LeWe T&uuml;rklingel</h1>");
            client.println("<p>Volume: <a href=\"/volume/" + String(volume-1) + "\"><button class=\"button2\">&minus;</button></a> " + String(volume) + " <a href=\"/volume/" + String(volume+1) + "\"><button class=\"button2\">&plus;</button></a></p>");
            client.println("<p><a href=\"/bell/on\"><button class=\"button\">Klingeln</button></a></p>");
            client.println("<p style='margin-top: 40px; font-size: 8px;'>dfplayer status: " + printDetail(dfPlayer.readType(), dfPlayer.read()) + "</p>");
            client.println("<p style='font-size: 8px;'>LED - State " + ledState + "</p>");
            client.println("</body></html>");
            
            // The HTTP response ends with another blank line
            client.println();
            
            // Break out of the while loop
            break;
          } else { // if you got a newline, then clear currentLine
            currentLine = "";
          }
        } else if (c != '\r') {  // if you got anything else but a carriage return character,
          currentLine += c;      // add it to the end of the currentLine
        }
      }
    }
    // Clear the header variable
    header = "";
    // Close the connection
    client.stop();
    Serial.println("Client disconnected.");
    Serial.println("");
  }
}

String printDetail(uint8_t type, int value){
  switch (type) {
    case TimeOut:
      return "Time Out!";
      break;
    case WrongStack:
      return "Stack Wrong!";
      break;
    case DFPlayerCardInserted:
      return "Card Inserted!";
      break;
    case DFPlayerCardRemoved:
      return "Card Removed!";
      break;
    case DFPlayerCardOnline:
      return "Card Online!";
      break;
    case DFPlayerPlayFinished:
      return "Play Finished!";
      break;
    case DFPlayerError:
      switch (value) {
        case Busy:
          return "Error: Card not found";
          break;
        case Sleeping:
          return "Error: Sleeping";
          break;
        case SerialWrongStack:
          return "Error: Get Wrong Stack";
          break;
        case CheckSumNotMatch:
          return "Error: Check Sum Not Match";
          break;
        case FileIndexOut:
          return "Error: File Index Out of Bound";
          break;
        case FileMismatch:
          return "Error: Cannot Find File";
          break;
        case Advertise:
          return "Error: In Advertise";
          break;
        default:
          break;
      }
      break;
    default:
      break;
  }
}

Credits

tliero

tliero

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