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Connecting ESP8266 WiFi Module with Computer Using PL2303

As soon as you get an ESP8266 WiFi module, the first thing you want to do is check if it’s working or not. The first thing you need to do to check it is to power it up either from a 3.3v source or a 5v source. Remember that the ESP Module is 3.3v compatible only so you have to be sure to make appropriate circuit for powering it up. Also remember that RX and TX pins of the module are also 3.3v compatible so better be careful when connecting to a TTL micro controller (check out this page for 3.3v compatible circuit and this page to make ESP module 5v compatible)

Next you want to connect it up to a computer to be able to send AT commands and see the response from the WiFi Module. AT Commands are used to configure the ESP module, set the IP addresses, change modes, create TCP/IP client / server, send data, receive data and much more. Basic introduction to some of the basic AT commands based communication is discussed here

To connect ESP module with a computer we use PL2303 USB to TTL Interface, it is a small USB to TTL serial tool, using the PL2303 chip. You can use it to connect some serial device to your PC via USB port.

PL2303 USB to TTL Interface

Buy PL2303 with jumper cables from Amazon – https://amzn.to/2LhlMeY 

Buy PL2303 from Amazon – https://amzn.to/2uw8mof

Buy PL2303 from alternate source for $1.47

Specification

  • Module Type : AdapterBoard
  • Size : 4.6 x 1.5 x 1.1cm
  • Operation Level : Digital 5V
  • Power Supply : External 5V

Following image shows how to connect 5V compatible ESP adaptor to PL2303 USB to TTL Interface

ESP8266 5v adaptor to PL2303 connection diagram

 

ESP8266 Module on 5v compatible adaptor connection with PL2303

 

5v compatible circuit diagram for ESP8266 connection with PL2303

 

 

Following image shows how to connect a 3.3v compatible ESP adaptor to PL2303 USB to TTL Interface

ESP8266 3.3v compatible adaptor connection with PL2303 USB to TTL Interface

 

ESP8266 Module on 3.3v compatible adaptor connection with PL2303 USB to TTL Interface

 

Circuit Diagram of ESP8266 with PL2303 power by 3.3v

Install the driver for PL2303 if you haven’t already and that’s it!!! you are ready to communicate with your WiFi Module.

Note: PL2303 is not the only USB to TTL converter in the world, check out the following alternates, compare prices to make a decision when buying

– DIY CP2102 Chip USB to TTL Converter Module Board

– FT232RL FTDI USB to TTL Serial Adapter Module – RED

– MaiTech High Performance CH340 Chip USB to TTL Converter Module – BLACK

DIY USB to RS485 TTL Serial Converter Adapter for Arduino – BLACK

– MCU2012 CP2102 USB to TTL Converter Communication Module – BLUE

 

 

Check out this link if you don’t know how to make a 5v compatible ESP8266 adaptor

Check out this link if you don’t know how to make a 3.3v compatible ESP8266 adaptor

Check out this link to start communication with AT Command Set for ESP8266

Absar A. Ansari

5 Comments

  1. WOW – have I been searching for a utility like this?
    This look very promising for a newbee hopefully could bring me at lot faster on track. Yes, please – send me a download link… 🙂

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