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



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|| '''Time'''
|| '''Narration'''

|-
|00:02
| Welcome to the''' '''Spoken Tutorial on '''Sending data to the cloud using IoT devices.'''

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|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'''

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|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.

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|00:56
|To record this tutorial, here I am using:
'''Ubuntu Linux 16.04''' OS

'''Arduino UNO board'''

'''Arduino IDE'''

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|01:08
|We also require some external components such as
'''DHT11 Sensor'''

'''MB102 Breadboard Power Supply Module'''

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|01:17
| '''ESP8266-01 WiFi Module'''

Recall that we have learnt about the '''pins''' of '''ESP8266-01 WiFi module''' in the earlier tutorial.

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|01:28
| This '''wifi module''' is widely used for the development of '''IoT applications'''.

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|01:34
|It has a '''built-in System on Chip''' with integrated '''TCP/IP stack.'''

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|01:40
|We will be using the '''MQTT protocol''' to send '''data''' over the '''network'''.

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|01:45
|'''MQTT''' stands for '''Message Queuing Telemetry Transport.'''

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|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.

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|02:00
|We will see the circuit connection of''' DHT11 '''and''' WiFi module''' with '''Arduino'''.

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|02:06
| Connect the '''VCC pin''' of the '''DHT11 sensor''' to the '''5V pin''' of '''Arduino'''.

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|02:12
|Connect the '''ground pin''' of the '''DHT11 sensor''' to the '''ground pin''' of '''Arduino'''.

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|02:17
|Connect '''Data pin''' of '''DHT11 sensor''' to '''GPIO2''' of '''ESP8266 Module'''.

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|02:24
|Note: The '''ESP8266 module''' works only on '''3.3V'''.

Connecting it to '''5V''' may damage the''' Wi-Fi module'''.

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| 02:34
| Next we will see how to set up the''' MB102 module''' on '''Breadboard'''.

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|02:40
|We need to use the '''3.3V''' supply to power up the '''wifi module'''.

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|02:45
|Make sure that the yellow coloured '''jumpers''' in the '''modules''' are fixed on the '''3.3V''' and '''OFF pins'''.

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|02:53
| Keep the white button of the '''module''' towards the right side of the '''breadboard''' as shown in the image.

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|02:59
|These are '''pins''' in pairs at the bottom of the '''MB102 module'''. 

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|03:04
|Place these '''pins''' of the '''module''' on the '''power rails''' of the '''breadboard''' as shown in the image.

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|03:10
|We can see a '''power jack point''' on the '''MB102 module'''.

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|03:14
|Plug in a '''9V-1A adapter''' in this '''power jack'''.

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|03:19
| To turn '''ON''' or '''OFF''' the '''MB102 module''', we have to press the white button.

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|03:25
|When the green light is turned '''on''', it means the '''module''' is switched '''on'''.

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|03:29
|Now the setup of the '''MB102 module''' is completed.

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| 03:34
| Let us see the other circuit connections.

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| 03:37
|Connect '''VCC''' and '''CH_PD pins''' of '''ESP8266''' to '''3.3V pin''' of '''MB102 power supply module'''.

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|03:48
| Connect '''GND''' pin of '''ESP8266''' to '''ground pin''' of '''MB102 power supply module'''.

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|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 '''reset'''ting the '''WiFi module'''.

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|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'''.

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|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'''.

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|04:29
|This is the live setup of the connection, as shown in the circuit diagram. 

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|04:34
|Now we will write the program in '''Arduino IDE''' for interfacing '''WiFi module '''and''' DHT11 Sensor.'''

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|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

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|04:52
| Open '''Arduino IDE'''. 

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|04:56
| Connect your '''Arduino board''' to your PC.

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|04:59
|First, we need to know the name of the '''port''' to which '''Arduino''' is connected.

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|05:03
|In the menu bar, go to the '''Tools''' menu. Select '''port''' option.

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|05:08
|In my case, the '''port''' is '''ttyUSB0. '''Note down your '''port''' name.

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|05:16
|'''Windows''' users can skip the steps below as the '''port''' is detected automatically.

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|05:23
| Open the'''terminal''' by pressing'''Ctrl+Alt+t''' keys simultaneously.

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|05:30
|Type, '''sudo space chmod space a+rw space slash dev slash ttyUSB0'''

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|05:45
|In my case, the '''port''' name is '''ttyUSB0'''

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|05:50
|You have to specify your '''port''' name. Press '''Enter'''.

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|05:55
|Enter the '''password''' for the system and press '''Enter'''.

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|06:00
|The above '''command''' gives '''read-write permission''' to the '''USB port.'''

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|06:05
| Switch back to '''Arduino IDE.'''

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|06:08
|Next we will configure the '''ESP8266 module''' to communicate. 

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|06:13
|Click on the '''File''' menu. Select '''Preferences'''.

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| 06:17
|New window will appear. In the '''Settings''' tab, go to the '''Additional Boards Manager URLs '''section.

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| 06:26
|Add this '''json URL'''. This will help to download '''ESP8266 WiFi module '''in''' Arduino IDE.'''

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| 06:35
|Click on the '''OK''' button at the bottom of the window.

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|06:39
|In the menu bar, click on the '''Tools''' menu and select '''Board'''. Then select the '''Board Manager''' option.

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| 06:47
|A new window will appear.

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| 06:49
|In the top right, we can see a '''search tab'''.

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| 06:53
|Here, type '''ESP8266''' and press '''Enter'''.

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| 06:58
|Select '''ESP8266 by ESP8266 Community'''.

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| 07:04
|In the version drop down box, select the '''latest version '''of the '''module'''.

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| 07:09
|Click on the '''Install '''button to install the '''module'''. 

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| 07:13
|Installation will take few minutes to complete.  Wait until it is installed successfully.

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|07:19
|The '''ESP8266 module''' is now installed in the '''Arduino IDE'''.

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| 07:24
|Click on the '''Close''' button at the right bottom of the window.

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| 07:28
| Next, we need to download a''' DHT sensor library''' to successfully run the code.

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| 07:33
|Click on the '''Sketch''' option. Select '''Include Library''' and then click on '''Manage Libraries'''.

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|07:41
|A new window will open.

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| 07:43
|Type '''Simple DHT''' on the '''search''' box.

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| 07:47
|Select the latest version and install the '''Simple DHT by Winlin'''.

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| 07:53
|Make sure that the above steps are done successfully before proceeding further.

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| 07:58
|Click on the '''Close''' button at the right bottom of the window. 

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| 08:02
| Type the code as shown. We have included the '''DHT and ESP8266 libraries''' to the code.

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| 08:11
|Here, we have to enter our '''channel Write API key '''which we generated already.

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|08:19
|'''SSID''' is the '''name''' of the '''Wi-Fi module'''.

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| 08:22
|'''Pass''' is the '''passcode '''to join the '''Wi-Fi network'''.

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| 08:26
|You have to give a unique '''ssid''' and '''password'''. This is the '''Thingspeak api server''', where we will be uploading the '''data'''.

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|08:36
|Define the '''data pin''' of '''DHT11 sensor''' connected to '''ESP8266 module''' as shown here.

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| 08:44
|This '''code''' sets the '''DHT11 data pin'''.

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| 08:48
|This line of '''code''' creates a '''client''' to the specified '''IP address''' or '''server'''.

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|08:56
|Type this '''code''' in the '''void setup function'''.

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| 09:00
|Here, the '''baud rate''' is '''set''' to '''115200''' as the '''WiFi module''' works on '''115200 baud rate'''.

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| 09:10
|The connection is established with the '''ssid''' and '''password''' which we declared earlier.

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| 09:18
|We will establish a connection between '''ThingSpeak server '''and''' ESP8266 WiFi module. '''

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|09:24
|Type this '''code''' in the '''void loop function'''.

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| 09:28
|We have '''declared''' two '''variables''' for '''humidity''' and '''temperature'''. This will read the '''temperature''' and '''humidity''' values.

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| 09:37
|First check whether the connection is established between the '''ThingSpeak cloud''' and '''WiFi module.'''

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| 09:43
|Then the '''data''' including '''humidity, temperature''' and '''API keys''' will be sent to the '''server'''.

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| 09:50
|Based on the '''API key''' value, the '''ThingSpeak server''' automatically selects the '''channel'''.

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| 09:56
|This prints the '''data''' on the '''ThingSpeak server''' where the '''WiFi module''' will be connected.

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| 10:10
|We are done with the required coding.

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|10:13
|Let us '''compile''' and save the program.

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| 10:16
|Click on the''' Compile''' button to verify the''' program.'''

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| 10:21
|A pop up window will appear to save the current '''program'''.

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| 10:25
|Name the '''program''' as '''DHT11_IoT '''and click on the '''Save''' button to save the '''program'''.

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|10:35
|Now, before uploading the '''program''' we have to select the '''ESP8266 module'''.

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| 10:41
|Click on the '''Tools''' option and select '''board'''. Scroll down and select '''Generic ESP8266 Module'''.

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|10:49
|Next step is to select the '''Reset''' option. 

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| 10:53
|In the menu bar, select '''Tools'''. Go to the '''Reset Method'''.

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| 10:58
|Select '''no dtr (aka ck).''' This will help to '''reset''' the '''wifi module''' manually.

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|11:07
|Next we need to '''set''' the '''built in LED''' of '''ESP8266 Module'''. 

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|11:12
|Again select '''Tools'''. Go to the '''Builtin LED '''option. Set the''' Builtin LED''' to '''1.'''

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|11:20
|Now click on the '''Upload''' button to upload the current '''program''' on''' ESP8266-01. '''

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| 11:27
|We can see the '''program''' getting uploaded at the bottom of the screen.

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| 11:31
|Now the '''program''' has been  successfully uploaded.

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|11:35
| After uploading the '''code''', disconnect the '''GPIO pin 0''' of '''ESP8266 module''' from ground.

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| 11:43
|First, the '''DHT11 module''' will get connected to the '''WiFi network'''.

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| 11:47
|It will read '''temperature''' and '''humidity''' data from the '''sensor'''.
After a few seconds, these values will be uploaded to '''ThingSpeak channel'''

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|11:59
|Let's see our output on our '''channel''' created on '''ThingSpeak'''. Go to the '''ThingSpeak''' page.

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| 12:07
|We can see a graph of '''temperature''' and '''humidity''' values from the '''DHT11 sensor'''.

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| 12:13
| Next, we will see how to export the current data of''' DHT11 sensor'''.

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|12:18
|Click on the '''Data Import/Export''' option on the '''GUI''' of your '''channel'''.

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|12:24
|Scroll down to see the '''Export''' option on the left side. Select the time zone as shown here.

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|12:32
|Now click on '''Download''' button. Click on the '''Save''' button. 

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|12:38
|Let us open the downloaded '''CSV''' file.

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|12:41
|Go to the '''Downloads''' folder and open the '''CSV''' file.

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|12:46
|Click on the OK button at the bottom of the window.

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|12:50
|This is the '''temperature''' and '''humidity data''' that is collected from the '''sensor'''. 

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|12:55
|With the '''ThingSpeak''' platform, it is possible to fetch the device reading in '''CSV''' file.

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| 13:01
| This is useful to help '''data analytics''' using '''R''' or '''Matlab'''.
Go through the '''R Spoken tutorials''' for '''data analytics'''.

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| 13:10
| This brings us to the end of this tutorial. Let us summarize. 

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|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.

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|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. 

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|14:10
|This is Saurabh signing off. Thanks for watching.
|-
|}