Difference between revisions of "Arduino/C2/Wireless-Connectivity-to-Arduino/English"

Learning objectives

• Configure and upload code on ESP8266-01 module
• Establish Wireless Communication between ESP and other devices

Pre-requisites

• Electronics
• C or C++ programming language and
• Wireless Communication

System Requirement

• Arduino Uno board
• Ubuntu Linux 16.04 OS and
• Arduino IDE

External Components Required

• ESP8266-01 Wi-Fi module
• Breadboard
• Jumper Wires and
• Push Button

Image ESP8266-01 module.jpg

VCC, RST, CH_PD, Tx, Ground, GPIO2, GPIO0, Rx are the pins of the Wi-Fi module.

Power LED indicates whether the module is ON or OFF.

COMM LED is the built-in blue LED of the WiFi module.

In this tutorial, we will see how to control this built-in LED using WiFi.

About ESP8266 - 01 Module

• This WiFi module has a built-in System on Chip with integrated TCP/IP stack.
• It has a UART and 2 GPIO pins (General Purpose Input / Output).
• It is widely used for development of IoT (i.e. Internet of Things) applications.

Image ESP Connection.png

Note:

The ESP8266-01 module works on 3.3V only.

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

• Connect ground pin of Wi-Fi module to ground pin of Arduino.
• Connect GPIO 0 pin of Wi-Fi module to ground of Arduino.

• Connect Rx pin of Wi-Fi module to Rx pin of Arduino.
• Connect Tx pin of Wi-Fi module to Tx pin of Arduino.
• Connect VCC and CH_PD pin of Wi-Fi module to 3.3V of Arduino.
• Connect a push button between RST pin of Wi-Fi module and ground pin of Arduino.

Live Setup

Image Setup Connection.jpg

Do the connection as shown here.

We will establish a connection between WiFi module and a laptop or a mobile phone.

Open Arduino IDE.

Tools => Port.

Go to the Tools menu. Select Port option.

In my case, the port is ttyUSB0. Note down your port name.

Windows users can skip the steps below as the port is detected automatically.

Type, sudo space chmod space a+rw space slash dev slash ttyUSB0

In my case, the port name is ttyUSB0

You have to specify your port name.

Press Enter.

Enter your password for the system and press Enter.

The above command gives read-write permission to the usb port.

Select Preferences.

A new window will appear.

In the Settings tab, go to the Additional Boards Manager URLs section.

Add this json URL.

This will help to download ESP8266 WiFi module in Arduino IDE.

Click on the OK button at the bottom of the window.

Then select Boards Manager option.

A new window will appear.

In the top right corner, we can see a search tab.

Here, type ESP8266 and press Enter.

Click on version drop down box

Click on install button

In the version drop down box, select the latest version of the module.

Click on Install button to install the module.

Installation will take few minutes to complete.

Wait until it is installed successfully.

Click on the Close button

Click on the Close button at the right bottom of the window.

Select ESP8266 module to upload the program.

Click on the Tools option and select Board.

Scroll down and select Generic ESP8266 Module.

Again select Tools.

Go to Builtin LED option. Set the Builtin LED to 1.

In the menu bar, select Tools. Go to Reset Method.

Select Reset method to no dtr (aka ck).

This will help to reset the wifi module manually.

Type the code as shown.

We have included the ESP8266 library.

Here, I have named the wifi network as WIFI_ESP8266_Pratik.

And the password for the module is 12345678.

You have to give your unique ssid and password.

Password parameter is not mandatory.

If you don’t give password parameter, Wi-Fi network will be open.

It will be accessible to everyone nearby.

The default IP address of the module is 192.168.4.1

{

delay(1000);

WiFi.softAP(ssid, password);

server.begin();

delay(2000);

This command will enable the SSID and Password for the ESP8266 module.

server.begin will enable the Wi-Fi network for the given SSID and Password.

A delay of 2 seconds is given to boot the module.

delay(100);

digitalWrite(BUILTIN_LED, HIGH);

}

{

// Check if a client has connected

WiFiClient client = server.available();

if (!client)

{

return;

}

This code is available in the Code files link of this tutorial

You can download and use it.

{

delay(1);

}

String req = client.readStringUntil('\r');

client.flush();

digitalWrite(BUILTIN_LED, HIGH);

else if (req.indexOf("LED_1/on") != -1)

digitalWrite(BUILTIN_LED, LOW);

else if (req.indexOf("/") != -1);

else

{

client.stop();

return;

}

client.flush();

client.print(HTML);

delay(10);

}

Image HTML_Page.png

When LED ON or LED OFF button is pressed, the value is passed to the program.

The program checks the value and controls the built-in LED of the ESP8266-01 module.

A pop up window will appear to save the current program.

Name the program as WiFi_ESP8266.

And click on the save button to save the program.

Press push button when the program is getting uploaded

We can see the program getting uploaded at the bottom of the screen.

When the state changes to Connecting, press the push button on the breadboard.

Release it after 2 to 3 seconds.

This indicates that the program is uploaded successfully.

Open Wi-Fi option of your mobile phone.

Search for nearest network to connect.

In my case, I am getting WIFI_ESP8266_Pratik since I have given this name in the code.

Select the WiFi.

Enter the password and check if it is connected to WiFi.

Enter the IP address 192.168.4.1

This is the default IP address of ESP8266-01 Wi-Fi module by the manufacturer.

Press LED OFF to turn off the built-in LED.

Image Module_OFF.jpg

Image Module_ON.jpg

We can see the LED of ESP8266-01 module is OFF.

Click on LED ON button which will turn on the blue LED of the Wi-Fi module.

It will be ON until we press the LED OFF button.

Click on LED OFF button which will turn off the blue LED of the Wi-Fi module.

Summary

• Configure and upload code on ESP8266-01 module
• Establish wireless communication between ESP and other devices

Assignment

1. Check if your PC or laptop has wireless connectivity and do the steps below.
2. On the top right corner, click on WiFi icon.
3. Select the name of your WiFi and enter the password.
4. Open the browser and go to 192.168.4.1
5. Select the button and see the output on the ESP8266-01 module.

About Spoken Tutorial Project

Please download and watch it

Spoken-Tutorial Workshop

Forum for specific questions

Acknowledgement

And this is Saurabh signing off.

Thanks for joining.