Initial commit

sketch_jan28.ino

+#include <Wire.h>
+#include <SoftwareSerial.h>
+#include <WiFiNINA.h>
+#include "ThingSpeak.h" // Always include ThingSpeak header file after other header files and custom macros
+
+char ssid[] = "Pixel_7931";    // network SSID (name)
+char pass[] = "norbert1";    // network password
+int keyIndex = 0;    // Your network key Index number (needed only for WEP)
+WiFiClient client;
+
+unsigned long myChannelNumber =  "2408902";
+const char *myWriteAPIKey = "AGU3FZ7L5ZZFL5VX";
+
+int number = 0;
+
+// Grove Temperature Sensor
+int temperaturePin = A0;
+
+// Grove Dust Sensor
+int dustPin = 8;
+unsigned long dustDuration;
+unsigned long dustStartTime;
+unsigned long dustSampleTime_ms = 30000; // sample 30s ;
+unsigned long dustLowPulseOccupancy = 0;
+float dustRatio = 0;
+float dustConcentration = 0;
+
+// Grove Buzzer Sensor
+int buzzerPin = 2;
+
+void setup() {
+  Serial.begin(9600);
+  while (!Serial); // Wait for serial port to connect
+
+  // Check for the WiFi module
+  if (WiFi.status() == WL_NO_MODULE) {
+    Serial.println("Communication with WiFi module failed!");
+    while (true);
+  }
+
+  String fv = WiFi.firmwareVersion();
+  if (fv != "1.0.0") {
+    Serial.println("Please upgrade the firmware");
+  }
+
+  ThingSpeak.begin(client);  // Initialize ThingSpeak
+
+  pinMode(temperaturePin, INPUT);
+  pinMode(dustPin, INPUT);
+  pinMode(buzzerPin, OUTPUT);
+  dustStartTime = millis(); // get the current time;
+}
+
+void loop() {
+  // Connect or reconnect to WiFi
+  if (WiFi.status() != WL_CONNECTED) {
+    Serial.print("Attempting to connect to SSID: ");
+    Serial.println(ssid);
+    while (WiFi.status() != WL_CONNECTED) {
+      WiFi.begin(ssid, pass); // Connect to WPA/WPA2 network. Change this line if using open or WEP network
+      Serial.print(".");
+      delay(5000);
+    }
+    Serial.println("\nConnected.");
+  }
+
+  // Read Temperature
+  int temperatureValue = analogRead(temperaturePin);
+  float voltage = temperatureValue * 5.0 / 1023.0;
+  float temperature = (voltage - 0.5) * 100.0;
+
+  // Read Dust Sensor
+  dustDuration = pulseIn(dustPin, LOW);
+  dustLowPulseOccupancy = dustLowPulseOccupancy + dustDuration;
+
+  // If the sample time is reached (30s)
+  if ((millis() - dustStartTime) > dustSampleTime_ms) {
+    dustRatio = dustLowPulseOccupancy / (dustSampleTime_ms * 10.0); // Integer percentage 0=>100
+    dustConcentration = 1.1 * pow(dustRatio, 3) - 3.8 * pow(dustRatio, 2) + 520 * dustRatio + 0.62; // using spec sheet curve
+
+    // Print dust sensor data
+    Serial.print("Dust: ");
+    Serial.print(dustLowPulseOccupancy);
+    Serial.print(",");
+    Serial.print(dustRatio);
+    Serial.print(",");
+    Serial.println(dustConcentration);
+
+    // Reset dust sensor values
+    dustLowPulseOccupancy = 0;
+    dustStartTime = millis();
+  }
+
+  // Control Buzzer based on temperature
+  if (temperature > 25.0) {
+    // If temperature is above 25 degrees Celsius, turn on the buzzer
+    digitalWrite(buzzerPin, HIGH);
+  } else {
+    // Otherwise, turn off the buzzer
+    digitalWrite(buzzerPin, LOW);
+  }
+
+  // Print temperature data
+  Serial.print("Temperature: ");
+  Serial.println(temperature);
+
+  // Write to ThingSpeak
+  int x = ThingSpeak.writeField(myChannelNumber, 1, temperature, myWriteAPIKey);
+  if (x == 200) {
+    Serial.println("ThingSpeak update successful.");
+  } else {
+    Serial.println("Problem updating ThingSpeak. HTTP error code " + String(x));
+  }
+
+  // Change the value
+  number++;
+  if (number > 99) {
+    number = 0;
+  }
+
+  delay(20000); // Wait 20 seconds to update ThingSpeak channel again
+}