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HumidityChecker.ino

+#include <ArduinoBLE.h>
+#include <SPI.h>
+#include <WiFiNINA.h>
+#include <Wire.h> 
+#include <LiquidCrystal_I2C.h>
+#include <dht.h> 
+#include <ThingSpeak.h>
+
+
+#define dht_apin A0
+
+BLEService HumidityService("180F");
+BLEUnsignedCharCharacteristic HumidityLevelChar("2A19", BLERead | BLENotify);
+
+int oldHumidityLevel = 0;
+long previousMillis = 0;
+
+LiquidCrystal_I2C lcd(0x27, 16, 2);
+dht DHT; 
+WiFiClient client;
+
+char ssid[] = "WIFISSID";
+char pass[] = "WIFIPASSWORD";
+int status = WL_IDLE_STATUS;
+
+unsigned long myChannelNumber = 2402736;
+const char * myWriteAPIKey = "5XC5K1SZ0RROOMTI";
+
+void setup() {
+  lcd.begin();
+  lcd.backlight();
+  Serial.begin(9600);
+  WiFi.begin(ssid, pass);
+  ThingSpeak.begin(client);
+
+  if (!BLE.begin()) {
+    Serial.println("Starting BLE failed!");
+  }
+
+
+  BLE.setLocalName("HumidityMonitor");
+  BLE.setAdvertisedService(HumidityService);
+  HumidityService.addCharacteristic(HumidityLevelChar);
+  BLE.addService(HumidityService);
+  HumidityLevelChar.writeValue(oldHumidityLevel);
+
+  BLE.advertise();
+
+  Serial.println("Bluetooth device active, waiting for connections");
+
+}
+
+void updateHumidityLevel() {
+  DHT.read11(dht_apin);
+  int Humidity = analogRead(A0);
+  int HumidityLevel = DHT.humidity;
+
+  if (HumidityLevel != oldHumidityLevel) { 
+    Serial.print("Humidity %  is now: ");
+    Serial.println(HumidityLevel);
+    HumidityLevelChar.writeValue(HumidityLevel);
+    oldHumidityLevel = HumidityLevel;
+  }
+}
+
+void loop() {
+
+  BLEDevice central = BLE.central();
+  DHT.read11(dht_apin);
+  float h = DHT.humidity;
+  float t = DHT.temperature;
+  Serial.print(h);
+
+  if (central) {
+    Serial.print("Connected to central: ");
+    Serial.println(central.address());
+    while (central.connected()) {
+      long currentMillis = millis();
+      if (currentMillis - previousMillis >= 200) {
+        previousMillis = currentMillis;
+        updateHumidityLevel();
+      }
+    }
+    Serial.print("Disconnected from central: ");
+    Serial.println(central.address());
+  }
+
+
+  ThingSpeak.setField(1,t);
+  ThingSpeak.setField(2,h);
+  ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
+
+  lcd.clear();
+  lcd.setCursor(0,0);
+  lcd.print("Humidity: ");
+  lcd.print(h);
+  lcd.setCursor(0,1);
+  lcd.print("Temp: ");
+  lcd.print(t);
+  delay(20000);
+
+}