Arduino/C3/Sending-data-to-the-cloud-using-IoT-devices/English-timed
From Script | Spoken-Tutorial
| 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. |
