Arduino/C3/Sending-data-to-the-cloud-using-IoT-devices/English-timed

Time	Narration
00:02	Welcome to the Spoken Tutorial on Sending data to the cloud using IoT devices.
00:08	In this tutorial, we will learn how to Establish connection between ESP8266-01 and DHT11 sensor Collect Temperature and Humidity values given by DHT11 sensor
00:25	Use ThingSpeak platform to store and visualize sensor readings and Download the data in CSV file
00:35	To follow this tutorial, you should have a basic knowledge of: Wireless Communication C or C++ programming language ThingSpeak account and Write API Key
00:50	If not, then go through the relevant Arduino spoken tutorials on this website.
00:56	To record this tutorial, here I am using: Ubuntu Linux 16.04 OS Arduino UNO board Arduino IDE
01:08	We also require some external components such as DHT11 Sensor MB102 Breadboard Power Supply Module
01:17	ESP8266-01 WiFi Module Recall that we have learnt about the pins of ESP8266-01 WiFi module in the earlier tutorial.
01:28	This wifi module is widely used for the development of IoT applications.
01:34	It has a built-in System on Chip with integrated TCP/IP stack.
01:40	We will be using the MQTT protocol to send data over the network.
01:45	MQTT stands for Message Queuing Telemetry Transport.
01:50	It is a simple messaging protocol, designed for devices with low bandwidth. We can read and publish data from sensors on the cloud.
02:00	We will see the circuit connection of DHT11 and WiFi module with Arduino.
02:06	Connect the VCC pin of the DHT11 sensor to the 5V pin of Arduino.
02:12	Connect the ground pin of the DHT11 sensor to the ground pin of Arduino.
02:17	Connect Data pin of DHT11 sensor to GPIO2 of ESP8266 Module.
02:24	Note: The ESP8266 module works only on 3.3V. Connecting it to 5V may damage the Wi-Fi module.
02:34	Next we will see how to set up the MB102 module on Breadboard.
02:40	We need to use the 3.3V supply to power up the wifi module.
02:45	Make sure that the yellow coloured jumpers in the modules are fixed on the 3.3V and OFF pins.
02:53	Keep the white button of the module towards the right side of the breadboard as shown in the image.
02:59	These are pins in pairs at the bottom of the MB102 module.
03:04	Place these pins of the module on the power rails of the breadboard as shown in the image.
03:10	We can see a power jack point on the MB102 module.
03:14	Plug in a 9V-1A adapter in this power jack.
03:19	To turn ON or OFF the MB102 module, we have to press the white button.
03:25	When the green light is turned on, it means the module is switched on.
03:29	Now the setup of the MB102 module is completed.
03:34	Let us see the other circuit connections.
03:37	Connect VCC and CH_PD pins of ESP8266 to 3.3V pin of MB102 power supply module.
03:48	Connect GND pin of ESP8266 to ground pin of MB102 power supply module.
03:55	Connect the RST that is Reset pin of ESP8266 module to one end of the push button. This push button is used for resetting the WiFi module.
04:05	Connect the other end of the push button to the ground terminal of Arduino Connect GPIO pin 0 of ESP8266 module to ground.
04:16	Connect the Tx pin of ESP8266 to the Tx pin of the Arduino. Connect the Rx pin of ESP8266 to the Rx pin of the Arduino.
04:29	This is the live setup of the connection, as shown in the circuit diagram.
04:34	Now we will write the program in Arduino IDE for interfacing WiFi module and DHT11 Sensor.
04:40	The files used in this tutorial are available in the Code files link on this tutorial page. Please download and extract them. Make a copy and then use them while practising
04:52	Open Arduino IDE.
04:56	Connect your Arduino board to your PC.
04:59	First, we need to know the name of the port to which Arduino is connected.
05:03	In the menu bar, go to the Tools menu. Select port option.
05:08	In my case, the port is ttyUSB0. Note down your port name.
05:16	Windows users can skip the steps below as the port is detected automatically.
05:23	Open theterminal by pressingCtrl+Alt+t keys simultaneously.
05:30	Type, sudo space chmod space a+rw space slash dev slash ttyUSB0
05:45	In my case, the port name is ttyUSB0
05:50	You have to specify your port name. Press Enter.
05:55	Enter the password for the system and press Enter.
06:00	The above command gives read-write permission to the USB port.
06:05	Switch back to Arduino IDE.
06:08	Next we will configure the ESP8266 module to communicate.
06:13	Click on the File menu. Select Preferences.
06:17	New window will appear. In the Settings tab, go to the Additional Boards Manager URLs section.
06:26	Add this json URL. This will help to download ESP8266 WiFi module in Arduino IDE.
06:35	Click on the OK button at the bottom of the window.
06:39	In the menu bar, click on the Tools menu and select Board. Then select the Board Manager option.
06:47	A new window will appear.
06:49	In the top right, we can see a search tab.
06:53	Here, type ESP8266 and press Enter.
06:58	Select ESP8266 by ESP8266 Community.
07:04	In the version drop down box, select the latest version of the module.
07:09	Click on the Install button to install the module.
07:13	Installation will take few minutes to complete. Wait until it is installed successfully.
07:19	The ESP8266 module is now installed in the Arduino IDE.
07:24	Click on the Close button at the right bottom of the window.
07:28	Next, we need to download a DHT sensor library to successfully run the code.
07:33	Click on the Sketch option. Select Include Library and then click on Manage Libraries.
07:41	A new window will open.
07:43	Type Simple DHT on the search box.
07:47	Select the latest version and install the Simple DHT by Winlin.
07:53	Make sure that the above steps are done successfully before proceeding further.
07:58	Click on the Close button at the right bottom of the window.
08:02	Type the code as shown. We have included the DHT and ESP8266 libraries to the code.
08:11	Here, we have to enter our channel Write API key which we generated already.
08:19	SSID is the name of the Wi-Fi module.
08:22	Pass is the passcode to join the Wi-Fi network.
08:26	You have to give a unique ssid and password. This is the Thingspeak api server, where we will be uploading the data.
08:36	Define the data pin of DHT11 sensor connected to ESP8266 module as shown here.
08:44	This code sets the DHT11 data pin.
08:48	This line of code creates a client to the specified IP address or server.
08:56	Type this code in the void setup function.
09:00	Here, the baud rate is set to 115200 as the WiFi module works on 115200 baud rate.
09:10	The connection is established with the ssid and password which we declared earlier.
09:18	We will establish a connection between ThingSpeak server and ESP8266 WiFi module.
09:24	Type this code in the void loop function.
09:28	We have declared two variables for humidity and temperature. This will read the temperature and humidity values.
09:37	First check whether the connection is established between the ThingSpeak cloud and WiFi module.
09:43	Then the data including humidity, temperature and API keys will be sent to the server.
09:50	Based on the API key value, the ThingSpeak server automatically selects the channel.
09:56	This prints the data on the ThingSpeak server where the WiFi module will be connected.
10:10	We are done with the required coding.
10:13	Let us compile and save the program.
10:16	Click on the Compile button to verify the program.
10:21	A pop up window will appear to save the current program.
10:25	Name the program as DHT11_IoT and click on the Save button to save the program.
10:35	Now, before uploading the program we have to select the ESP8266 module.
10:41	Click on the Tools option and select board. Scroll down and select Generic ESP8266 Module.
10:49	Next step is to select the Reset option.
10:53	In the menu bar, select Tools. Go to the Reset Method.
10:58	Select no dtr (aka ck). This will help to reset the wifi module manually.
11:07	Next we need to set the built in LED of ESP8266 Module.
11:12	Again select Tools. Go to the Builtin LED option. Set the Builtin LED to 1.
11:20	Now click on the Upload button to upload the current program on ESP8266-01.
11:27	We can see the program getting uploaded at the bottom of the screen.
11:31	Now the program has been successfully uploaded.
11:35	After uploading the code, disconnect the GPIO pin 0 of ESP8266 module from ground.
11:43	First, the DHT11 module will get connected to the WiFi network.
11:47	It will read temperature and humidity data from the sensor. After a few seconds, these values will be uploaded to ThingSpeak channel
11:59	Let's see our output on our channel created on ThingSpeak. Go to the ThingSpeak page.
12:07	We can see a graph of temperature and humidity values from the DHT11 sensor.
12:13	Next, we will see how to export the current data of DHT11 sensor.
12:18	Click on the Data Import/Export option on the GUI of your channel.
12:24	Scroll down to see the Export option on the left side. Select the time zone as shown here.
12:32	Now click on Download button. Click on the Save button.
12:38	Let us open the downloaded CSV file.
12:41	Go to the Downloads folder and open the CSV file.
12:46	Click on the OK button at the bottom of the window.
12:50	This is the temperature and humidity data that is collected from the sensor.
12:55	With the ThingSpeak platform, it is possible to fetch the device reading in CSV file.
13:01	This is useful to help data analytics using R or Matlab. Go through the R Spoken tutorials for data analytics.
13:10	This brings us to the end of this tutorial. Let us summarize.
13:15	In this tutorial, we learnt to: Establish connection between ESP8266-01 and DHT11 sensor Collect Temperature and Humidity values given by DHT11 Sensor
13:25	Use ThingSpeak platform to store and visualize sensor readings and Download the data in CSV file
13:39	The video at the following link summarizes the Spoken Tutorial project. Please download and watch it.
13:45	The Spoken Tutorial Project Team conducts workshops and gives certificates. For more details, please write to us.
13:54	Please post your timed queries in this forum.
13:58	The Spoken Tutorial project is funded by MHRD, Government of India.
14:04	This tutorial has been contributed by FOSSEE and Spoken Tutorial Project, IIT Bombay.
14:10	This is Saurabh signing off. Thanks for watching.

Contributors and Content Editors

Pratik kamble