15. Measure Temperature and Upload data in ThingSpeak

Overview of ThingSpeak IoT platform

According to its developers, "ThingSpeak is an open-source Internet of Things (IoT) application and API to store and retrieve data from things using the HTTP protocol over the Internet or via a Local Area Network. ThingSpeak enables the creation of sensor logging applications, location tracking applications, and a social network of things with status updates".
ThingSpeak was originally launched by ioBridge in 2010 as a service in support of IoT applications.
ThingSpeak   has   integrated   support    from    the    numerical    computing    software MATLAB from MathWorks, allowing ThingSpeak users to analyze and visualize uploaded data using MATLAB without requiring the purchase of a MATLAB license from MathWorks.
ThingSpeak has a close relationship with MathWorks, Inc. In fact, all of the ThingSpeak documentation is incorporated into the MathWorks' MATLAB documentation site and even enabling registered MathWorks user accounts as valid login credentials on the ThingSpeak website. The terms of service and privacy policy of ThingSpeak.com are between the agreeing user and MathWorks, Inc.

Connection of LM35:


The Output pin of LM35 is Connected to A0 pin of ESP8266 Module, Ground pin is connected to the ground pin of ESP8266 Module and VCC is connected to 3V3 Pin of ESP8266 module.


Method to interface IFTTT:

Step1: Search Thingspeak in browser and open it. 


Step2: click on “Get Started For free” and create account.


Step3: click on New channel.


Step4: Edit name and choose field and its name. then, click on save channel according to below figure.


Step5: After save channel open a new window. In this window have field chart, API key, channel setting and many more. Now click on API keys and get API keys as shown in figure.


Method to make code using TUNIOT:

Step1: Search TUNIOT in browser and open it. Then, we see Two Blocks, first block is Setup and Second Block is main Loop. In Left side given the blocks.

Step2: first, we disconnect network. Go-to—IOT—IOT STATION—Select Disconnect.


Step3: Now Esp8266 Connect with a network. So, we use network ssid and password. So, GOTO—IOT—IOT Access Point—WIFI ssid and password block. And change ssid and password according to your WIFI network.


Step4: when network is not connected then network is continuously search and try to connected. GOTO—IOT—Select Repeat while.


Step5: Then Go to—IOT—Thingspeak and Select field Block and in place of value we delete Text block and add Analog pin. So, go to—IN/OUT— ANALOG—Select Analog pin according to figure. And also fill API key in API key Text bar.


Step6: then add delay block and enter delay value is 3000 milliseconds and match all the blocks according to the below figure.


Step7: block arrangement is completed then convert all the blocks in code.  Then click on Video icon and enter name and press Ok. After, downloading the Code open in Arduino IDE and upload in NodeMCU.


Step8: After uploaded the code open ThingSpeak Channel makes by above process and see in field chart your data is directly Uploaded time to time in this chart according to figure.


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