LuzZXXV0

1/*
2Author: Rahul Shrivastava
3This programs send data to Thingspeak.com to a particular channel, here the data is collected by LM35
4Also, You donot need to hardcode SSID and PWD, it can be reconfigured using  http://192.168.4.1,
5#connect to Autoconnect wifi hotspot, open URL "http://192.168.4.1" 
6#and goto configure wifi and select available network, your device will connect to that network  
7*/
8
9#include <Arduino.h>
10
11#include <ESP8266WiFi.h>
12#include <DNSServer.h>
13#include <WiFiManager.h>
14
15#include <ESP8266HTTPClient.h>
16
17float j=0;
18int sensor = A0;// analog input, anlog sensor is connected to this pin, LM35
19
20void setup() {
21
22     
23    Serial.begin(115200);
24    Serial.flush();
25    WiFiManager wifiManager;
26    wifiManager.autoConnect("RS_Sensor_Node");
27    Serial.println("connected to Tonar_LM35_Sensor_Node:)");
28 
29}
30
31void loop() {
32    float val = analogRead(sensor);
33    float vout = (val * 3300.0) / 1023;
34    float tempc = vout / 10; // Storing value in Degree Celsius
35    j = tempc;
36      
37    
38        HTTPClient http; //http is the object of class HTTPClient this class defines the method to create and send HTTP requests    
39
40        Serial.print("Connected to HOTSPOT..\n");
41        
42        String urlRS = "http://api.thingspeak.com/update?api_key=SCONMG0S3BGN3DPM&field1=";// api key of Tonar System lm35 channel(674722)
43               urlRS +=j;
44        http.begin(urlRS); 
45
46        Serial.print("HTTP REQUEST SENT, Waiting for response\n");
47        
48        // start connection and send HTTP header
49        int httpCode = http.GET();
50
51        // httpCode will be negative on error
52        
53        if(httpCode > 0) {
54            // HTTP header has been send and Server response header has been handled
55            Serial.printf("Sensor data uploaded sucessfully");
56
57                             
58    }
59    else
60    {
61      Serial.printf("Failed to connect to server");
62      }
63 http.end();   
64
65
66
67    delay(16000);
68}