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TempMon

+#include <math.h>
+#include <Wire.h>
+#include "rgb_lcd.h"
+#include <ArduinoMqttClient.h>
+#include <WiFiNINA.h>
+#include "arduino_secrets.h"
+#include "ThingSpeak.h"
+
+char ssid[] = SECRET_SSID;
+char pass[] = SECRET_PASS;
+unsigned long myChannelNumber = 2504682;
+const char * myWriteAPIKey = "SNN8Y9Q55L68MOY5";
+
+WiFiClient wifiClient;
+MqttClient mqttClient(wifiClient);
+
+const char broker[] = "test.mosquitto.org";
+int        port     = 1883;
+const char topic[]  = "st_john_iot_temperature_value_topic";
+
+rgb_lcd lcd;
+
+const int colorR = 0;
+const int colorG = 0;
+const int colorB = 255;
+
+const int B = 4275;
+const int R0 = 100000;
+const int pinTempSensor = A0;
+
+const long interval = 8000;
+unsigned long previousMillis = 0;
+
+int count = 0;
+
+#if defined(ARDUINO_ARCH_AVR)
+#define debug  Serial
+#elif defined(ARDUINO_ARCH_SAMD) ||  defined(ARDUINO_ARCH_SAM)
+#define debug  SerialUSB
+#else
+#define debug  Serial
+#endif
+
+void setup() {
+  // put your setup code here, to run once:
+
+    //Initialize serial and wait for port to open:
+  Serial.begin(9600);
+  while (!Serial) {
+    ; // wait for serial port to connect. Needed for native USB port only
+  }
+
+  // attempt to connect to Wifi network:
+  Serial.print("Attempting to connect to WPA SSID: ");
+  Serial.println(ssid);
+  while (WiFi.begin(ssid, pass) != WL_CONNECTED) {
+    // failed, retry
+    Serial.print(".");
+    delay(5000);
+  }
+
+  Serial.println("You're connected to the network");
+  Serial.println();
+
+  ThingSpeak.begin(wifiClient);
+
+  Serial.print("Attempting to connect to the MQTT broker: ");
+  Serial.println(broker);
+
+  if (!mqttClient.connect(broker, port)) {
+    Serial.print("MQTT connection failed! Error code = ");
+    Serial.println(mqttClient.connectError());
+
+    while (1);
+  }
+
+    Serial.println("You're connected to the MQTT broker!");
+  Serial.println();
+
+  Serial.begin(9600);
+  pinMode(6, OUTPUT);
+
+  lcd.begin(16, 2);
+    
+  lcd.setRGB(colorR, colorG, colorB);
+
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+    int a = analogRead(pinTempSensor);
+
+    float R = 1023.0/a-1.0;
+    R = R0*R;
+
+    float temperature = 1.0/(log(R/R0)/B+1/298.15)-273.15; // convert to temperature via datasheet
+
+    ThingSpeak.setField(2, temperature);
+    ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
+
+    if (temperature >= 29){
+        digitalWrite(6, HIGH);
+        delay(1000);
+        digitalWrite(6, LOW);
+        delay(1000);
+    }
+    else {digitalWrite(6,LOW);}
+
+    lcd.setCursor(0, 1);
+    lcd.print(temperature);
+
+    delay(100);
+
+    delay(100);
+
+  // call poll() regularly to allow the library to send MQTT keep alive which
+  // avoids being disconnected by the broker
+  mqttClient.poll();
+
+  unsigned long currentMillis = millis();
+
+  if (currentMillis - previousMillis >= interval) {
+    // save the last time a message was sent
+    previousMillis = currentMillis;
+
+    Serial.print("Sending message to topic: ");
+    Serial.println(topic);
+    Serial.println(temperature);
+
+    // send message, the Print interface can be used to set the message contents
+    mqttClient.beginMessage(topic);
+    mqttClient.print(temperature);
+    mqttClient.endMessage();
+
+    Serial.println();
+  }
+ 
+
+}