ujAAx9M7

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 <ESP8266WiFiMulti.h>
14#include <WiFiManager.h>
15
16#include <ESP8266HTTPClient.h>
17
18float j=0;
19int sensor = A0;// analog input, anlog sensor is connected to this pin, LM35
20
21void setup() {
22
23     
24    Serial.begin(115200);
25    Serial.flush();
26    WiFiManager wifiManager;
27    wifiManager.autoConnect("Tonar_LM35_Sensor_Node");
28    Serial.println("connected to Tonar_LM35_Sensor_Node:)");
29 
30}
31
32void loop() {
33    float val = analogRead(sensor);
34    float vout = (val * 3300.0) / 1023;
35    float tempc = vout / 10; // Storing value in Degree Celsius
36    j = tempc;
37      
38    
39        HTTPClient http; //http is the object of class HTTPClient this class defines the method to create and send HTTP requests    
40
41        Serial.print("Connected to HOTSPOT..\n");
42        
43        String urlRS = "http://api.thingspeak.com/update?api_key=SCONMG0S3BGN3DPM&field1=";// api key of Tonar System lm35 channel(674722)
44               urlRS +=j;
45        http.begin(urlRS); 
46
47        Serial.print("HTTP REQUEST SENT, Waiting for response\n");
48        
49        // start connection and send HTTP header
50        int httpCode = http.GET();
51
52        // httpCode will be negative on error
53        
54        if(httpCode > 0) {
55            // HTTP header has been send and Server response header has been handled
56            Serial.printf("Sensor data uploaded sucessfully");
57
58                             
59    }
60    else
61    {
62      Serial.printf("Failed to connect to server");
63      }
64 http.end();   
65
66
67
68    delay(16000);
69}