Working
Tutorial on Connecting NodeMCU to Thingsio.ai Cloud
Part I: Installation and Settings of Arduino IDE
Part II: Setting Up Cloud Account on Thingsio.AI
Part III: Setting Up NodeMCU
Part IV: Charting and Visualizations on Thingsio.AI

Published November 17, 2018 © MIT

NodeMCU-Based IoT Project: Connecting LM35 Sensor

The goal of this tutorial is to enable you to capture and send data to cloud from NodeMCU.

BeginnerProtip1,484

NodeMCU-Based IoT Project: Connecting LM35 Sensor

Things used in this project

Hardware components

NodeMCU ESP8266 Breakout Board

LM35 Temperature sensor

Software apps and online services

Arduino IDE

thingsio.ai.

Story

Working

In this project temperature sensor(LM35) is connected to NodeMCU board in such a way that -

- vcc pin to 5v of NodeMCU or can connect to external 5v

- gnd pin to gnd of NodeMCU

- output pin to analog pin of NodeMCU A0)

So whatever is the temperature of the surrounding is, lm35 will read and pass it to NodeMCU through A0 pin, further the board process that data from lm35 and send it to cloud(thingsio.ai server) so that we can easily access the data from anywhere and will able to take decision based on the data value

Tutorial on Connecting NodeMCU to Thingsio.ai Cloud

NodeMCU is one of the most popular IoT Development platform use by the thousands of developers worldwide. What is more attractive is that it can run on the even more popular Arduino IDE.

NodeMCU alone is able to connect and send the data to cloud that makes it more preferable(no need to have bunch of boards, only one is enough).

The goal of this tutorial is to enable you to send capture and send data to cloud from your NodeMCU device. Before starting this tutorial make sure you have your NodeMCU and lm35 sensor handy.

Part I: Installation and Settings of Arduino IDE

Once you download and install the arduino ide, to get start with ide it is good to check this first (http://www.circuitbasics.com/arduino-basics-installing-software).

Part II: Setting Up Cloud Account on Thingsio.AI

ThingsIO.AI is a IoT platform for developers. As a developer we understood the pain of not having a seamless place to connect, analyze and process device data. Many pure analytics platforms does not offer device management, which is core for the iot. That is the reason of ThingsIO.AI
Register the account in http://thingsio.ai/#/register.
You will get the notification for sign up.
Go in your email address and verify your account.
After that, sign in your account with your email address and password
Now, you will be on the project dashboard. Click on the new project option.
Click on the add a new device option. You will get device ID.
Enter the device name and click on the create and configure device.
You will be on your device dashboard.

some basic points(1-5) for analysing data on thingsio.ai

1. Track your device’s special parameters here. This can be set in device configuration(default to null).

2. You can see your real time and special parameter’s graph.

3. You can see your all data points.

4. You can see here your last 5 data points.

5. You can see here all the list of created graphs.

Go in sample device code options and click on the NodeMCU
You will get the sample code from there copy and paste into your Arduino ide.

Click on the “Send trial data” to send a trial data to the server:

Part III: Setting Up NodeMCU

we have already made hardware connection so just upload this code on nodemcu by using an usb. and open your serial monitor where you see the values of temperature in different units.

- one important thing while uploading the code, check the device id.

Part IV: Charting and Visualizations on Thingsio.AI

Go to your thingsio.ai account and go to your device ->

Click on the configuration device option:

You can set the special parameters (this is tracked on the device dashboard) & transform it accordingly and add new parameters (Parameters are updated automatically as you send them from your device).
Click on the update device option:
To create a graph for your device click on the “create graph option."

Code

LM35 temperature sensor source code

///////////////////////////////Code-1//////////////////////////////////////
//////////////////////////////Code-2 is from 200th line///////////////////
//////////////////////////////*******/////////////////////////////////////
#include <ESP8266WiFi.h>


const char* ssid = "*******"; // ******* is your wifi SSID name

 
const char* host = "api.thingsio.io";
const char* post_url = "/devices/deviceData"; 
const char* time_server = "www.convert-unix-time.com"; 
const int httpPort = 80;
char timestamp[10];
int count=0,i,m,j,k;
int t,t1,t2,t3;
int outputpin= A0;//ds18b20 


WiFiClient client;
int GiveMeTimestamp()
{
  unsigned long timeout = millis();

  while (client.available() == 0)
  {
    if (millis() - timeout > 50000)
    {
      client.stop();
      return 0;
    }
  }

while (client.available())
      {
        String line = client.readStringUntil('\r');                    //indexOf() is a funtion to search for smthng , it returns -1 if not found
        int pos = line.indexOf("\"timestamp\"");                       //search for "\"timestamp\"" from beginning of response got and copy all data after that , it'll be your timestamp
        if (pos >= 0)                                                     
        {
          int j = 0;
          for(j=0;j<10;j++)
          {
            timestamp[j] = line[pos + 12 + j];
          }
        }
      }
}  
 
void setup() {
 
  Serial.begin(115200);
  WiFi.disconnect();
  delay(10);
  Serial.println();
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
 
  WiFi.begin(ssid );
 
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("NodeMcu connected to wifi...");
  Serial.println(ssid);
  Serial.print("IP Address: ");
  Serial.println(WiFi.localIP());
  Serial.println();
}
 
void loop() {
  
  int analogValue = analogRead(outputpin);
{
 
  
/////////////////////////////////////// SEND THE QUERY AND RECEIVE THE RESPONSE///////////////////////  



        t1=(analogValue/1024.0) *5000;
        Serial.print("temp: ");
        Serial.println(t1);

        t2=(t1/10);
        Serial.print("celc: ");
        Serial.println(t2);

        t3=((t2 * 9)/5 + 32);
        Serial.print("fhrn: ");
        Serial.println(t3);        //break;

          

  Serial.print("connecting to ");
  Serial.println(host);                          //defined upside :- host = devapi2.thethingscloud.com or 139.59.26.117

///////////////////////////////////// TIMESTAMP CODE SNIPPET /////////////////////////
Serial.println("inside get timestamp\n");
  if (!client.connect(time_server, httpPort)) 
  {
    return;                                                        //*-*-*-*-*-*-*-*-*-*
  }

  client.println("GET /api?timestamp=now HTTP/1.1");                            //Whats this part doing, i didnt get
  client.println("Host: www.convert-unix-time.com");
  client.println("Cache-Control: no-cache");
  client.println("Postman-Token: ea3c18c6-09ba-d049-ccf3-369a22a284b8");
  client.println();

GiveMeTimestamp();                        //it'll call the function which will get the timestamp response from the server
Serial.println("timestamp receieved");
Serial.println(timestamp);
///////////////////////////////////////////////////////////////////////////////

// Use WiFiClient class to create TCP connections
  if (!client.connect(host, httpPort))            //host = devapi2.thethingscloud.com , port = 80
  {
    Serial.println("connection failed");                  // *-*-*-*-*-*--*-*-*-*-*-*-*-*-*-*-*-*-
    return;
  }
  
  client.print("Content-Length: ");
  client.println(); 

  unsigned long timeout = millis();
  while (client.available() == 0) 
  {
    if (millis() - timeout > 50000) 
    {
      Serial.println(">>> Client Timeout !");
      client.stop();
      return;
    }
  }
  
  Serial.println("***********************************************");
  Serial.println();
  Serial.println("closing connection");

  Serial.println("inside ThingsCloudPost");

 
  String PostValue = "{\"device_id\": 209239, \"slave_id\": 2";
         PostValue = PostValue + ",\"dts\":" +timestamp;
   PostValue = PostValue +",\"data\":{\"celc\":" + t2 +",\"fahr\":" + t3 +"}"+"}";
  
  
  Serial.println(PostValue);

//////////////////////////////// try to connect to server again and POST the data on the cloud //////////////////////////
  if (!client.connect(host, httpPort)) 
  {
    return;
  }

  client.print("POST ");
  client.print(post_url);               /// POST api/device-datas         HTTP/1.1     Host: baas.thethingscloud.com      Content-Type: application/json        Cache-Control: no-cache
  client.println(" HTTP/1.1");           //Authorization:          Content-Length: 
  client.print("Host: ");
  client.println(host);
  client.println("Content-Type: application/json");
  client.println("Cache-Control: no-cache");
  client.print("Authorization: Bearer eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.IjViZTk1NzRiNDAyYjlkNGI5MDdiZjgwNyI.Ao71P5YERN9E66J7KJHRR5FczsJIHhmv44X7w9QoKCI");
  client.println();
  client.print("Content-Length: ");
  client.println(PostValue.length());
  client.println();
  client.println(PostValue);
 
//////////////////////////////////POSTING the data on to the cloud is done and now get the response form cloud server//////////////////
  while (client.available() == 0) 
  {
    if (millis() - timeout > 50000) 
    {
      Serial.println(">>> Client Timeout !");
      client.stop();
      return;
    }
  }
  
  Serial.println("Response From Server");
  while(client.available())
  { 
    String line2 = client.readStringUntil('\r');   
    Serial.print(line2);
    
  }
    
Serial.println("//////////////////////    THE END     /////////////////////");
delay(3000);
}
}

///////////////////////////////////Code-2///////////////////////////////////////
//////////////////////////////or you can use this code also/////////////////////
////////////////////////////////***************************////////////////////////////////////////////////////////////////////////////////////////////////////
#include <SoftwareSerial.h>
SoftwareSerial mySerial(12, 13); // RX, TX

#include <ESP8266WiFi.h>          //https://github.com/esp8266/Arduino
#include <DNSServer.h>
#include <ESP8266WebServer.h>
#include "WiFiManager.h"          //https://github.com/tzapu/WiFiManager

int count=0,i,m,j,k;
int t,t1,t2,t3;
int outputpin= A0;//ds18b20 


//////////////////////////////////////// ALL DECLARATIONS for CLOUD //////////////////////////////
const char* host = "api.thingsio.ai";                                 // OR host = devapi2.thethingscloud.com
const char* post_url = "/devices/deviceData";       // OR /api/v2/thingscloud2/_table/data_ac
const char* time_server = "www.convert-unix-time.com";             //this is to convert timestamp
const int httpPort = 80;

char timestamp[10];

WiFiClient client;
  


/////////////////////////////////////////////////////////////////////////////////////////////////////////
void configModeCallback (WiFiManager *myWiFiManager) 
{
  Serial.println("Entered config mode");             //*-*-*-*-*-*-*-*-*-*-*-*-*-*if control enters this function then net is not connected
  Serial.println(WiFi.softAPIP());                  // "WiFi.softAPIP() is for AP" , "WiFi.localIP() is for STA",
                                                                
  Serial.println(myWiFiManager->getConfigPortalSSID());             //if you used auto generated SSID, print it
}
/////////////////////////////////////// TIMESTAMP CALCULATION function///////////////////////////////////////
int GiveMeTimestamp()
{
  unsigned long timeout = millis();

  while (client.available() == 0)
  {
    if (millis() - timeout > 50000)
    {
      client.stop();
      return 0;
    }
  }

while (client.available())
      {
        String line = client.readStringUntil('\r');                    //indexOf() is a funtion to search for smthng , it returns -1 if not found
        int pos = line.indexOf("\"timestamp\"");                       //search for "\"timestamp\"" from beginning of response got and copy all data after that , it'll be your timestamp
        if (pos >= 0)                                                     
        {
          int j = 0;
          for(j=0;j<10;j++)
          {
            timestamp[j] = line[pos + 12 + j];
          }
        }
      }
}  
////////////////////////////////////////////////////////////////////////////////////////////////////////

void setup() 
{
  Serial.begin(115200);     //(19200,SERIAL_8E1) - data size = 8 bits , parity = Even , stop bit =  1bit
mySerial.begin(115200);
  WiFiManager wifiManager;
 
  wifiManager.setAPCallback(configModeCallback);
                                                                                                    
  if(!wifiManager.autoConnect("abcd","*****"))                   //wifiManager.autoConnect("AP-NAME", "AP-PASSWORD"); (OR) wifiManager.autoConnect("AP-NAME"); only ID no password (OR) wifiManager.autoConnect(); this will generate a ID by itself
  {
    Serial.println("failed to connect and hit timeout");     //control comes here after long time of creating Access point "NodeMCU" by NodeMCU and still it has not connected
    //reset and try again, or maybe put it to deep sleep
    ESP.reset();
    delay(1000);
  } 

  //if you come here you have connected to the WiFi
  Serial.println("connected...yeey :");
 
}

void loop() 
{
  int analogValue = analogRead(outputpin);
{
 
  
/////////////////////////////////////// SEND THE QUERY AND RECEIVE THE RESPONSE///////////////////////  



        t1=(analogValue/1024.0) *5000;
        Serial.print("temp: ");
        Serial.println(t1);

        t2=(t1/10);
        Serial.print("celc: ");
        Serial.println(t2);

        t3=((t2 * 9)/5 + 32);
        Serial.print("fhrn: ");
        Serial.println(t3);        //break;

          

  Serial.print("connecting to ");
  Serial.println(host);                          //defined upside :- host = devapi2.thethingscloud.com or 139.59.26.117

///////////////////////////////////// TIMESTAMP CODE SNIPPET /////////////////////////
Serial.println("inside get timestamp\n");
  if (!client.connect(time_server, httpPort)) 
  {
    return;                                                        //*-*-*-*-*-*-*-*-*-*
  }

  client.println("GET /api?timestamp=now HTTP/1.1");                            //Whats this part doing, i didnt get
  client.println("Host: www.convert-unix-time.com");
  client.println("Cache-Control: no-cache");
  client.println("Postman-Token: ea3c18c6-09ba-d049-ccf3-369a22a284b8");
  client.println();

GiveMeTimestamp();                        //it'll call the function which will get the timestamp response from the server
Serial.println("timestamp receieved");
Serial.println(timestamp);
///////////////////////////////////////////////////////////////////////////////

// Use WiFiClient class to create TCP connections
  if (!client.connect(host, httpPort))            //host = devapi2.thethingscloud.com , port = 80
  {
    Serial.println("connection failed");                  // *-*-*-*-*-*--*-*-*-*-*-*-*-*-*-*-*-*-
    return;
  }
  
  client.print("Content-Length: ");
  client.println(); 

  unsigned long timeout = millis();
  while (client.available() == 0) 
  {
    if (millis() - timeout > 50000) 
    {
      Serial.println(">>> Client Timeout !");
      client.stop();
      return;
    }
  }
  
  Serial.println("***********************************************");
  Serial.println();
  Serial.println("closing connection");

  Serial.println("inside ThingsCloudPost");

 
  String PostValue = "{\"device_id\": 209239, \"slave_id\": 2";
         PostValue = PostValue + ",\"dts\":" +timestamp;
   PostValue = PostValue +",\"data\":{\"celc\":" + t2 +",\"fahr\":" + t3 +"}"+"}";
  
  
  Serial.println(PostValue);

//////////////////////////////// try to connect to server again and POST the data on the cloud //////////////////////////
  if (!client.connect(host, httpPort)) 
  {
    return;
  }

  client.print("POST ");
  client.print(post_url);               /// POST api/device-datas         HTTP/1.1     Host: baas.thethingscloud.com      Content-Type: application/json        Cache-Control: no-cache
  client.println(" HTTP/1.1");           //Authorization:          Content-Length: 
  client.print("Host: ");
  client.println(host);
  client.println("Content-Type: application/json");
  client.println("Cache-Control: no-cache");
  client.print("Authorization: Bearer eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.IjViZTk1NzRiNDAyYjlkNGI5MDdiZjgwNyI.Ao71P5YERN9E66J7KJHRR5FczsJIHhmv44X7w9QoKCI");
  client.println();
  client.print("Content-Length: ");
  client.println(PostValue.length());
  client.println();
  client.println(PostValue);
  
//////////////////////////////////POSTING the data on to the cloud is done and now get the response form cloud server//////////////////
  while (client.available() == 0) 
  {
    if (millis() - timeout > 50000) 
    {
      Serial.println(">>> Client Timeout !");
      client.stop();
      return;
    }
  }
  
  Serial.println("Response From Server");
  while(client.available())
  { 
    String line2 = client.readStringUntil('\r');   
    Serial.print(line2);
    
  }
    
Serial.println("//////////////////////    THE END     /////////////////////");
delay(3000);
}
}

Credits

HARGOVIND

8 projects • 16 followers

NodeMCU-Based IoT Project: Connecting LM35 Sensor

Things used in this project

Hardware components

Software apps and online services

Story

Working

Tutorial on Connecting NodeMCU to Thingsio.ai Cloud

Part I: Installation and Settings of Arduino IDE

Part II: Setting Up Cloud Account on Thingsio.AI

Part III: Setting Up NodeMCU

Part IV: Charting and Visualizations on Thingsio.AI

Schematics

NodeMcu connection diagram with lm35 sensor

Code

LM35 temperature sensor source code

Credits

HARGOVIND

Comments

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NodeMCU-Based IoT Project: Connecting LM35 Sensor

NodeMCU-Based IoT Project: Connecting LM35 Sensor

Things used in this project

Hardware components

Software apps and online services

Story

Working

Tutorial on Connecting NodeMCU to Thingsio.ai Cloud

Part I: Installation and Settings of Arduino IDE

Part II: Setting Up Cloud Account on Thingsio.AI

Part III: Setting Up NodeMCU

Part IV: Charting and Visualizations on Thingsio.AI

Schematics

NodeMcu connection diagram with lm35 sensor

Code

LM35 temperature sensor source code

Credits

HARGOVIND

Comments

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