detection.ino

#include "application.h"

unsigned int nextTime = 0;    // Next time to contact the server

const int gasOutput = A0;
// int DangerLight = D7;

float MidConcThreshold = 650;
// float HighConcThreshold =1000;

float CurrentValue=0;
int i=0;

void setup() {
    Serial.begin(9600);
    //  pinMode(DangerLight, OUTPUT);
}

void loop() {
    CurrentValue = analogRead(gasOutput);
    
Serial.println("Keep Calm. no danger !");

Spark.publish("Gas_Concentration",String(CurrentValue));
delay(1000);
}

A sample code on using spark.publish() method to send data to the cloud server. The cloud API URL and other credentials are mentioned in application.h file.