#7 Introduction to ESP01 WiFi Module Commands | Arduino Mega | APDaga Tech

IoT Tutorial #7 [ Arduino Mega Tutorials #7]


Here, I will explain step by step (Manually) how you can send data to the server using ESP01 Wi-Fi Module. (Not using any Program)

Recommended Internet of Things (IOT) Courses:

1. Udemy: Complete Guide to Build IOT Things from Scratch to Market
2. LinkedIn: IoT Foundations: Fundamentals
3. edX: Introduction to the Internet of Things (IoT)
4. edureka: IoT Certification Training on Azure
5. Coursera: An Introduction to Programming the Internet of Things (IOT) Specialization
6. Eduonix: Internet Of Things (IOT) Bundle

Basic knowledge of communication layers is as follows:


Communication Layers:
Application Layer : Generate Msg Signal (Eg. Serial Monitor)
Network Layer      : Assign Source and Destination IP Address to Msg
Data Link Layer    : Data packet will be framed bit by bit
Physical Layer       : Transmitted / Received via medium.

Follow these steps:

1. Connect ESP01 Module in configuration mode
   PIN Diagram of ESP01: (This module works on 3.3v) (NOT 5v)

   +---------------------------+
   | |=| |=| |=|============== |
   | | | | | | |    ANTENA     |
   | | |=| |=| | Facing ur side|
   | ========================= |
   |                           |
   | GND   GPIO0   GPIO2   RxD |
   |  o      o      o       o  |
   |                           |
   |  o      o      o       o  |
   | TxD   CH_PD    RST    Vcc |
   +---------------------------+

   Connections for configuration:

   ESP01      Arduino
   Vcc    ->  3.3V
   GND    ->  GND
   TxD    ->  Tx0
   RxD    ->  Rx0
   CH_PD  ->  3.3V

2. Open Arduino Serial Monitor and Set Baud Rate = 115200 and select "Both NL and CR" Option
   
   
3. Type following AT commands in given Sequence
   

   FORMAT:
   ---------------------------
   <Command>
   :Explanation
   --<Expected Output>
   ---------------------------

   
   
   
   

   AT
   :Attention Command
   --OK

   AT+CWMODE=1  
   :Setting Mode=1
   --OK

   AT+CWLAP
   :Searching for all available Access Points
   --<List of Available Wi-Fi access points>

   AT+CWJAP="<SSID Name>","<password>"
   :To Connect to any Access Point
   Eg. AT+CWJAP="SuiteUp","123456789"
   --WIFI CONNECTED
   --WIFI GOT IPs
   --OK

   AT+CWJAP?  
   :To check to which SSID we are connected
   --<Connected WiFi SSID Name>

   AT+CIFSR
   :To check IP & MAC addr of the WiFi Module
   --<Static IP Address>
   --<Static MAC Address>

   
   
   
   

   AT+CIPMUX=0
   :To set Mux = 0
   --OK

   AT+CIPSTART="TCP","google.com",80
   :We are asking module to start TCP IP Communication with google.com at port no. 80
   --CONNECT
   --OK

   AT+CIPSEND=18
   :Send 18 Bytes of data
   --OK
   > (prompt is opened)

   This will open a prompt like ">". Then you can send the data using GET command in that prompt as shown below:
   

   GET /HTTP/1.0\r\n\r\n
   :Send API string 
   --Recv 18 bytes
   --SEND OK

   you can check: "/HTTP/1.0\r\n\r\n" This string contains 18 character.
   
   If we mention fewer bytes in the previous command then send more no. of byte then the server will accept only mentioned no. of byte and ignore remaining bytes.
   
   Instead of "/HTTP/1.0\r\n\r\n", you can call APIs to send the data to the server and make the graph or do the analysis and post work.
   
   If your ESP01 module isn't working as expected and you need to reset it to default, you can use the following command:
   

   AT+RESTORE
   : To Restore all settings to Default
   --OK

   
   To understand better Watch the demonstration video below.

Demonstration:

Click here to see more codes for Arduino Mega (ATMega 2560) and similar Family.

Feel free to ask doubts in the comment section. I will try my best to solve it.

If you find this helpful by any mean like, comment and share the post.

This is the simplest way to encourage me to keep doing such work.

Thanks and Regards,

-Akshay P. Daga