Smart-Machine-Health-Monitoring-System/Arduino Code(C++) at main · AHMEDOUJESS/Smart-Machine-Health-Monitoring-System · GitHub

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#include <DHT.h>
#include <SoftwareSerial.h>

#define DHTPIN 2
#define DHTTYPE DHT11

#define VIBRATION_PIN A0
#define SOUND_PIN A1

DHT dht(DHTPIN, DHTTYPE);

// WiFi module pins
SoftwareSerial esp(9, 10); // RX, TX

String apiKey = "YOUR_THINGSPEAK_API_KEY";
String ssid = "YOUR_WIFI_NAME";
String password = "YOUR_WIFI_PASSWORD";

void setup() {
  Serial.begin(9600);
  esp.begin(9600);
  dht.begin();

  connectWiFi();
}

void loop() {

  float temperature = dht.readTemperature();
  int vibration = analogRead(VIBRATION_PIN);
  int sound = analogRead(SOUND_PIN);

  String status = checkStatus(temperature, vibration, sound);

  sendData(temperature, vibration, sound, status);

  delay(15000);  // ThingSpeak allows update every 15 sec
}

String checkStatus(float temp, int vib, int sound) {
  int alertCount = 0;

  if (temp > 50) alertCount++;
  if (vib > 600) alertCount++;
  if (sound > 500) alertCount++;

  if (alertCount >= 2)
    return "Critical";
  else if (alertCount == 1)
    return "Warning";
  else
    return "Healthy";
}

void connectWiFi() {
  esp.println("AT");
  delay(2000);

  esp.println("AT+CWMODE=1");
  delay(2000);

  String cmd = "AT+CWJAP=\"" + ssid + "\",\"" + password + "\"";
  esp.println(cmd);
  delay(5000);
}

void sendData(float temp, int vib, int sound, String status) {

  String data = "GET /update?api_key=" + apiKey +
                "&field1=" + String(temp) +
                "&field2=" + String(vib) +
                "&field3=" + String(sound) +
                "&field4=" + status;

  esp.println("AT+CIPSTART=\"TCP\",\"api.thingspeak.com\",80");
  delay(2000);

  esp.println("AT+CIPSEND=" + String(data.length() + 4));
  delay(2000);

  esp.println(data);
  delay(2000);

  esp.println("AT+CIPCLOSE");
}