//Soft serial port library
SoftwareSerial mySerial(10, 11); //MP3 TX pin to 10，RX pin to 11
//Please enter your sensitive data in the Secret TAB /arduino_secrets.h
char ssid[] = "test12"; // Your wifi SSID(Name)
char pass[] = "11111111"; // Your wifi password (for WPA, or as a WEP key)
int keyIndex = 0; // Your wifi Key Index number (required for WEP only)
int val = 0;
int redPin = 6; // define RGB redpin pin to D6
int greenPin = 5; // define RGB greenpin pin to D5
int bluePin = 3; // define RGB bluepin pin to D3
int buzzerPin = 2; // define active buzzer pin to D2
int motorPin = 9; // define the digital control pin of DC motor to D9
int servoPin = 8; // define servo pin to 8
Servo myservo; // Create a servo object to control the servo
int status = WL_IDLE_STATUS;
WiFiServer server(80);
void setup() {
Serial.begin(9600); // Initialize the hardware serial port
mySerial.begin(9600); // Initialize the software serial port
pinMode(redPin, OUTPUT); // set RGB redpin pin to output
pinMode(greenPin, OUTPUT); // set RGB greenpin pin to output
pinMode(bluePin, OUTPUT); // set RGB bluepin pin to output
pinMode(motorPin, OUTPUT); // set DC motor motorPin pin to output
pinMode(buzzerPin, OUTPUT); // set active buzzer pin to output
myservo.attach(servoPin); //set servo pin to D8
myservo.write(0); //Rotate to 0 degrees
delay(1000); //delay 1s
// Check WiFi module:
if (WiFi.status() == WL_NO_MODULE) {
Serial.println("Communication with WiFi module failed!");
// Not continue
while (true);
}
String fv = WiFi.firmwareVersion();
if (fv < WIFI_FIRMWARE_LATEST_VERSION) {
Serial.println("Please upgrade the firmware");
}
// Try to connect to a WiFi network:
while (status != WL_CONNECTED) {
Serial.print("Attempting to connect to Network named: ");
Serial.println(ssid); // Print Network Name (SSID)
// Connect to a WPA/WPA2 network, if using an open or WEP network, change this line:
status = WiFi.begin(ssid, pass);
// Wait 10 seconds to connect:
delay(10000);
}
server.begin(); // Start the web server on port 80
printWifiStatus(); // You're now connected, so print out the status
}
void loop() {
WiFiClient client = server.available(); // Monitor incoming clients in real time
if (client) { // If you're listening to the client,
Serial.println("new client"); // Print a message on the serial port
String currentLine = ""; // Creates a string to hold the data passed in from the client
while (client.connected()) { // Loop when the client connects
if (client.available()) { // If there are bytes to be read from the client,
char c = client.read(); // Read a byte, and then
Serial.write(c); // Print to serial monitor
if (c == '\n') { // If the byte is a newline character
// If the current action is empty, there are two newlines in a line.
// This is the end of the client's HTTP request, so a response is sent:
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 going to happen, followed by a blank line:
client.println("HTTP/1.1 200 OK");
client.println("Content-type:text/html");
client.println();
// The content of the HTTP response follows the header:
client.print("Click here turn on RGB
");
client.print("Click here turn off RGB
");
client.print("Click here turn on fan
");
client.print("Click here turn off fan
");
client.print("Click here turn on buzzer
");
client.print("Click here turn off buzzer
");
client.print("Click here turn on MP3
");
client.print("Click here
servo turn to 180
");
client.print("Click here
servo turn to 0
");
// The HTTP response ends with another blank line:
client.println();
// exit the while loop:
break;
} else { // If there is a newline, clear currentLine:
currentLine = "";
}
} else if (c != '\r') { // If you have any characters other than the return character,
currentLine += c; // And add it to the end of currentLine
}
// Check whether the client request exists "GET /A"or"GET /B"or"GET /C"or"GET /D"or"GET /E"or"GET /F"or"GET /G"or"GET /H"or"GET /I":
if (currentLine.endsWith("GET /A")) { // GET /A RGB on
// Cycle through basic colors
color(255, 0, 0); // Red
delay(1000); // Wait for 1 second
color(0, 255, 0); // Green
delay(1000); // Wait for 1 second
color(0, 0, 255); // Blue
delay(1000); // Wait for 1 second
// Cycle through blended colors
color(255, 0, 252); // Magenta
delay(1000); // Wait for 1 second
color(237, 109, 0); // Orange
delay(1000); // Wait for 1 second
color(255, 215, 0); // Yellow
delay(1000); // Wait for 1 second
color(34, 139, 34); // Forest Green
delay(1000); // Wait for 1 second
color(0, 112, 255); // Light Blue
delay(1000); // Wait for 1 second
color(0, 46, 90); // Indigo
delay(1000); // Wait for 1 second
color(128, 0, 128); // Purple
delay(1000); // Wait for 1 second
}
if (currentLine.endsWith("GET /B")) { // GET /B RGB off
color(0, 0, 0); // Black
}
if (currentLine.endsWith("GET /C")) { // GET /C DC motor rotates
digitalWrite(motorPin, LOW);
}
if (currentLine.endsWith("GET /D")) { // GET /D DC motor does not rotate
digitalWrite(motorPin, HIGH);
}
if (currentLine.endsWith("GET /E")) { // GET /E turn on buzzer
digitalWrite(buzzerPin, HIGH);
}
if (currentLine.endsWith("GET /F")) { // GET /F turn off buzzer
digitalWrite(buzzerPin, HIGH);
}
if (currentLine.endsWith("GET /G")) { // GET /F MP3 plays audio
MP3();
}
if (currentLine.endsWith("GET /H")) { // GET /H servo rotates to 180°
myservo.write(180); //servo rotates to 180°
delay(1000); //delay 1s
}
if (currentLine.endsWith("GET /I")) { // GET /I servo rotates to 0°
myservo.write(0); //servo rotates to 0°
delay(1000); //delay 1s
}
}
}
// disconnect:
client.stop();
Serial.println("client disconnected");
}
}
void printWifiStatus() {
// Print the SSID of the wifi you are connected to
Serial.print("SSID: ");
Serial.println(WiFi.SSID());
// Print the IP address received by the main control board
IPAddress ip = WiFi.localIP();
Serial.print("IP Address: ");
Serial.println(ip);
// Print the received signal strength
long rssi = WiFi.RSSI();
Serial.print("signal strength (RSSI):");
Serial.print(rssi);
Serial.println(" dBm");
// open http://[ip] in your browser
Serial.print("To see this page in action, open a browser to http://");
Serial.println(ip);
}
void MP3() {
int cmd1[]={0x7e, 0xff, 0x06, 0x0f, 0x00, 0x01, 0x01, 0xef}; //song 01 corresponding command, hexadecimal
for(char i=0; i<8; i++){
mySerial.write(cmd1[i]);
}
delay(2000);
int cmd2[]={0x7e, 0xff, 0x06, 0x0f, 0x00, 0x01, 0x02, 0xef}; //song 02 corresponding command, hexadecimal
for(char i=0; i<8; i++){
mySerial.write(cmd2[i]);
}
delay(2000);
int cmd3[]={0x7e, 0xff, 0x06, 0x0f, 0x00, 0x01, 0x03, 0xef}; //song 03 corresponding command, hexadecimal
for(char i=0; i<8; i++){
mySerial.write(cmd3[i]);
}
delay(2000);
int cmd4[]={0x7e, 0xff, 0x06, 0x0f, 0x00, 0x01, 0x04, 0xef}; //song 04 corresponding command, hexadecimal
for(char i=0; i<8; i++){
mySerial.write(cmd4[i]);
}
delay(2000);
int cmd5[]={0x7e, 0xff, 0x06, 0x0f, 0x00, 0x01, 0x05, 0xef}; //song 05 corresponding command, hexadecimal
for(char i=0; i<8; i++){
mySerial.write(cmd5[i]);
}
delay(2000);
int cmd6[]={0x7e, 0xff, 0x06, 0x0f, 0x00, 0x01, 0x06, 0xef}; //song 06 corresponding command, hexadecimal
for(char i=0; i<8; i++){
mySerial.write(cmd6[i]);
}
delay(2000);
int cmd7[]={0x7e, 0xff, 0x06, 0x0f, 0x00, 0x01, 0x07, 0xef}; //song 07 corresponding command, hexadecimal
for(char i=0; i<8; i++){
mySerial.write(cmd7[i]);
}
delay(2000);
}
// Function to set the RGB LED color
void color(int red, int green, int blue) {
// Write analog values to the RGB pins
analogWrite(redPin, red);
analogWrite(greenPin, green);
analogWrite(bluePin, blue);
}
```
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**5. Test Result**
Click  to upload code. After uploading the code, wire up and the external power supply is connected to the UNO R4 WiFi board to power the board.
**NOTE:** To prevent the fan from working normally sometimes, be sure to give the UNO R4 WiFi motherboard external power supply, so as to ensure that the fan can work normally and prevent the motherboard from burning out.
Open serial monitor to set the baud rate to **9600**. The monitor prints the IP address.
**TIP: If you turn on the serial monitor and set the baud rate without seeing any information on the monitor, try to press the RESET button on the UNO R4 WiFi board.**
Then open the browser to enter the **WIFI IP address (192.168.43.124)** on the serial monitor as shown above, and click “**search**”.
**ATTENTION: the WiFi name and password in the code are the same as that of the network (or WiFi) connected to the smartphone/tablet (or computer). And the computer and smartphone/tablet should be on the same network (or WiFi).**
After a few seconds, the WiFi web page is displayed, indicating that the ESP32 module on the UNO R4 WiFi main board has successfully connected to WiFi.
**Special note**: Wait until the speaker on the MP3 module finishes playing the voice, and then Click here in "Click here servo turn to 180".
| Icon | Click | Function |
| --------------------- | -------- | ------------------------------------------------------------ |
| | click here | turn on RGB LED in various colors |
| | click here | turn off RGB LED |
| | click here | turn on DC motor, fan rotates |
|  | click here | turn off DC motor, fan does not rotate |
|  | click here |turn on active buzzer |
|  | click here |turn off active buzzer |
| | click here | turn on the speaker on the MP3 to broadcast |
| | click here | servo ratates to 180° |
|| click here | servo ratates to 0°. |
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**6. Code Explanation**
Please refer to the Code Explanation of previous projects.