Contains all what you need for getting sensor data & interacting with Analog and Digital PINS & making network request

arduino.c

rgb_lcd lcd;

const int PIN_SOUND = A0;
const int PIN_TEMP = A1;
const int PIN_LIGHT = A2;

const int PIN_BUTTON = 6;
const int PIN_LED = 13;
const int PIN_BUZZER = 1;

bool isButtonActive = true;

// Temperature Related
const int B = 3975;


#pragma region UTILS
#pragma region BUZZER ACTIVATION

int length = 15; // the number of notes
char notes[] = "aaafbfbf "; // a space represents a rest
int beats[] = { 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 4 };
int tempo = 200;
void playTone(int tone, int duration) {
    for (long i = 0; i < duration * 1000L; i += tone * 2) {
        digitalWrite(PIN_BUZZER, HIGH);
        delayMicroseconds(tone);
        digitalWrite(PIN_BUZZER, LOW);
        delayMicroseconds(tone);
    }
}

void playNote(char note, int duration) {
    char names[] = { 'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C' };
    int tones[] = { 1915, 1700, 1519, 1432, 1275, 1136, 1014, 956 };
    // play the tone corresponding to the note name
    for (int i = 0; i < 8; i++) {
        if (names[i] == note) {
            playTone(tones[i], duration);
        }
    }
}
void activateBuzzer(){
  Serial.println("Buzzer toggle");
    for (int i = 0; i < 10; i++){
       playNote('g', beats[i] * tempo);
    }
}
/*--END BUZZER ACTIVATION*/ 
#pragma endregion

#pragma region LED ACTIVATION
void ledBlinking() {
    int i;
    for(i = 0 ; i < 5 ; i++) {
        turnOnLed();
        delay(50); 
        turnOffLed();       
    }
}

void turnOnLed(){
    digitalWrite(PIN_LED, HIGH);
}
void turnOffLed(){
    digitalWrite(PIN_LED, LOW);
}
#pragma endregion

int toInt(String str){
    int len = str.length();
    int i;
    int dec = 0;
    for(i=0;i <len ;i++) {
        dec = dec * 10 + (str[i] - '0');
    }  

    return dec;
}

void setLcdMessage(String msg){
  lcd.clear();
  lcd.print(msg);
  lcd.display();
}

void toggleButton(){
    if(digitalRead(PIN_BUTTON)){
        isButtonActive = !isButtonActive;
    }
}

float getTemperature(){
    int val = analogRead(PIN_TEMP);
    // Determine the current resistance of the thermistor based on the sensor value.
    float resistance = (float)(1023-val)*10000/val;
    // Calculate the temperature based on the resistance value.
    return 1/(log(resistance/10000)/B+1/298.15)-273.15;
}

int getSound(){
    return analogRead(PIN_SOUND);
}

int getLight(){
    return analogRead(PIN_LIGHT);
}


void initLcd(){
    lcd.begin(16,2);
}
void initEthernet(){
    system("ifup eth0");
    if (Ethernet.begin(mac) == 0) {
      Serial.print("Failed to configure Ethernet using DHCP");
      // no point in carrying on, so do nothing forevermore:
      for(;;)
        ;
    } else {
      Serial.println("connection succsessufl");  
    }
}

void initPins(){
    pinMode(PIN_BUTTON, INPUT);
    pinMode(PIN_LED, OUTPUT);
    pinMode(PIN_BUZZER, OUTPUT);
}

/**-- END UTILS DATA */
#pragma endregion

example.c

void setup(){
    Serial.begin(9600);
    delay(2000);

    initLcd();
    initEthernet();
    initPins();
}

void loop() {
    executeWithButtonCheck();
    // execute();
}


void executeWithPowerCheckFromServer(){
    updateTogglableValues();
    if(isButtonActive == true){
        execute();
    } else {
        turnOff();
    }
}


void execute(){
    update();
}

void update(){
    // Get Data From Server
  // && update Gloabl Variables
}

void turnOff(){
    setLcdMessage("OFF");
    turnOffLed();
}

networking.c

/**
* Example Of usage
* String url = "/client?type=temp&value=15"; 
* int result = getIntFromServer(url); // Pass an url to the function and it will return an integer
* sendRequest(url); // 
*/


// Change PORT Number
const int PORT = 3000;
// Change IP ADDRESS
IPAddress server(172, 16, 197, 90);


// If you want to send data
void sendRequest(String url){
    getMessageFromServer(url, false);
}

// Return Int From Server
int getIntFromServer(String url){
    int number = 0;
    String message = getMessageFromServer(url, true);
    // ---> THIS LINE Uncoment if an error occurs
    // number = toInt(message);
    number = message.toInt();
    return number;
}
// Return String from Server
String getStringFromServer(String url) {
    return getMessageFromServer(url, false);
}


// Helper functions
String getMessageFromServer(String url, boolean isNumber){
    EthernetClient client;
    String result = "";
    if(client.connect(server,PORT)) {
        client.println(url);
        client.println();
        if(client.available()){
            delay(500);
            if(isNumber){
                result = getIntMessage(client);
            } else {
                result = getStringMessage(client);
            }
            
        }
    } else {
        Serial.println("Client connection Failed");
    }

    client.stop();
    return result;
}

String getIntMessage(EthernetClient client){
    String result = "";
        
    while(client.available()) {
        // If an errors occurs uncoment this win and comment the line below
        // also make sure to uncoment toInt() function in getIntFromServer
        // result += client.read() - '0';
        result += (char)client.read();
    }

    return result;
}

String getStringMessage(EthernetClient client){
    String result = "";
    
    while(client.available()) {
        result += client.read();
    }
    return result;
}

int toInt(String str){
    int len = str.length();
    int i;
    int dec = 0;
    for(i=0;i <len ;i++) {
        dec = dec * 10 + (str[i] - '0');
    }  

    return dec;
}

thank you !! =D