Networking and Communications

Master Code

            
             // Wire Master Writer
            // by Nicholas Zambetti [http://www.zambetti.com](http://www.zambetti.com)

            // Demonstrates use of the Wire library
            // Writes data to an I2C/TWI Peripheral device
            // Refer to the "Wire Peripheral Receiver" example for use with this

            // Created 29 March 2006

            // This example code is in the public domain.


            #include ⁢Wire.h>
            #define SDA_PIN D4
            #define SCL_PIN D5

            void setup() {
              Serial.begin(115200);   // better speed for RP2040
              delay(1000);

              Wire.setSDA(SDA_PIN);   // set SDA pin
              Wire.setSCL(SCL_PIN);   // set SCL pin
              Wire.begin(); // join i2c bus (address optional for master)
            }

            byte x = 0;

            void loop()
            {
              Wire.beginTransmission(4); // transmit to device #4
              Wire.write("x is ");        // sends five bytes
              Wire.write(x);              // sends one byte
              Wire.endTransmission();    // stop transmitting

              x++;
              delay(500);
            }
             
            

Peripheral Code

            
             // Wire Peripheral Receiver
            // by Nicholas Zambetti [http://www.zambetti.com](http://www.zambetti.com)

            // Demonstrates use of the Wire library
            // Receives data as an I2C/TWI Peripheral device
            // Refer to the "Wire Master Writer" example for use with this

            // Created 29 March 2006

            // This example code is in the public domain.

            #include ⁢Wire.h>
            #define SDA_PIN D4
            #define SCL_PIN D5

            void setup() {
              Serial.begin(115200);   // better speed for RP2040
              delay(1000);

              Wire.setSDA(SDA_PIN);   // set SDA pin
              Wire.setSCL(SCL_PIN);   // set SCL pin
              Wire.begin(4);                // join i2c bus with address #4
              Wire.onReceive(receiveEvent); // register event
              Serial.begin(9600);           // start serial for output
            }

            void loop()
            {
              delay(100);
            }

            // function that executes whenever data is received from master
            // this function is registered as an event, see setup()
            void receiveEvent(int howMany)
            {
              while(1 ⁢ Wire.available()) // loop through all but the last
              {
                char c = Wire.read(); // receive byte as a character
                Serial.print(c);         // print the character
              }
              int x = Wire.read();    // receive byte as an integer
              Serial.println(x);         // print the integer
            }
             
            

Chatgpt AI
Prompt Used:

Master Code

            
            #include 

            #define STUDENT_ADDR 0x10
            #define BUTTON D9

            void setup() {
              Wire.begin();
              pinMode(BUTTON, INPUT);
              Serial.begin(115200);
            }

            void loop() {
              int state = digitalRead(BUTTON);

              Wire.beginTransmission(SLAVE_ADDR);
              Wire.write(state);   // 1 = pressed, 0 = released
              Wire.endTransmission();

              Serial.print("Button: ");
              Serial.println(state);

              delay(100);
            }
             
            

Peripheral Code

            
            #include ⁢Wire.h>
            #include ⁢DFRobotDFPlayerMini.h>

            #define STUDENT_ADDR 0x10

            DFRobotDFPlayerMini player;

            bool isPlaying = false;

            void receiveEvent(int howMany) {
              while (Wire.available()) {
                int val = Wire.read();

                if (val == 1 && !isPlaying) {
                  Serial.println("Play");
                  player.playFolder(1, 1);  // plays 0001.mp3 in folder 01
                  isPlaying = true;
                }

                if (val == 0 && isPlaying) {
                  Serial.println("Stop");
                  player.stop();
                  isPlaying = false;
                }
              }
            }

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

              // DFPlayer Serial
              Serial1.begin(9600);

              if (!player.begin(Serial1)) {
                Serial.println("DFPlayer NOT detected");
                while (1);
              }

              player.volume(0); // 0-30

              Wire.begin(STUDENT_ADDR);
              Wire.onReceive(receiveEvent);

              Serial.println("Ready");
            }

            void loop() {}