AirQualityArduino.ino

#include <ESP8266WiFi.h>
#include <PubSubClient.h>

const int sensor=A0; // Assigning analog pin A0 to variable 'sensor'
float tempc;  //variable to store temperature in degree Celsius
float tempf;  //variable to store temperature in Fahreinheit 
float vout;  //temporary variable to hold sensor reading

//-------- Customise these values ----------

const char* ssid = "PC-Faster-2049";
const char* password = "pcf26143";

#define ORG "jwczs2"
#define DEVICE_TYPE "mydevice"
#define DEVICE_ID "nodemcu1"
#define TOKEN "0kjkChN)+lw!j*MbNc"
//-------- Customise the above values --------
 
char server[] = ORG ".messaging.internetofthings.ibmcloud.com";
char topic[] = "iot-2/evt/Data/fmt/json";
char authMethod[] = "use-token-auth";
char token[] = TOKEN;
char clientId[] = "d:" ORG ":" DEVICE_TYPE ":" DEVICE_ID;
 
WiFiClient wifiClient;
PubSubClient client(server, 1883,wifiClient);

void setup() {
 Serial.begin(115200);
 Serial.println();
 
pinMode(sensor,INPUT);


 Serial.print("Connecting to ");
 Serial.print(ssid);
 WiFi.begin(ssid, password);
 while (WiFi.status() != WL_CONNECTED) {
 delay(500);
 Serial.print(".");
 } 
 Serial.println("");
 
 Serial.print("WiFi connected, IP address: ");
 Serial.println(WiFi.localIP());
}
 
void loop() {
vout=analogRead(sensor);
vout=(vout*500)/1024;
tempc=vout; // Storing value in Degree Celsius
tempf=(vout*1.8)+32; // Converting to Fahrenheit 
PublishData(tempf);
delay(10000);
}
void PublishData(float temp){
 if (!!!client.connected()) {
 Serial.print("Reconnecting client to ");
 Serial.println(server);
 while (!!!client.connect(clientId, authMethod, token)) {
 Serial.print(".");
 delay(500);
 }
 Serial.println();
 }
  String payload = "{\"d\":{\"temperature\":";
  payload += temp;
  payload += "}}";
 Serial.print("Sending payload: ");
 Serial.println(payload);
  
 if (client.publish(topic, (char*) payload.c_str())) {
 Serial.println("Publish ok");
 } else {
 Serial.println("Publish failed");
 }
}