WiFi 3 Click

How does it work?

WiFi 3 Click is based on the ESP8266MOD, a WiFi module with a built-in TCP/IP protocol stack from Ai-Thinker. The module uses ESP8266EX, a Tensilica 32-bit MCU from Espressif, featuring extra low power consumption of under 1.0mW, which makes this Click board™ ideal for battery-driven projects. It runs at 80MHz (up to 160MHz) and has its SRAM and ROM. This Click board™ also has a PCB trace antenna to connect successfully to the 2400-2482.5MHz frequency band. The ESP8266MOD integrates an RF balun, antenna switches, power amplifiers, low noise receive amplifiers, power management nodes, and more. At typical -72dBm, the ESP8266MOD can achieve up to 72.2Mbps of data rate.

To communicate with the host MCU, the WiFi 3 Click uses the UART interface of the mikroBUS™ socket, with commonly used UART RX and TX pins. It also uses additional pins, such as the RST pin, that resets the WiFi module with a LOW logic state. Apart from Reset, the RST pin can also wake the chipset from a deep sleep. If this function is unnecessary, remove the 0Ω resistor, which turns OFF this feature. The EN pin is tied to the chip power-down pin to disable the ESP8266MOD with a LOW logic state. In addition, this Click board™ features an HD1 header with ESP8266MOD user-configurable GPIO pins 0, 12, 13, 14, 2, and 15.

This Click board™ can only be operated with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. However, the Click board™ comes equipped with a library containing functions and an example code that can be used as a reference for further development.

Specifications

Pinout diagram

This table shows how the pinout on WiFi 3 Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
	NC	1	AN	PWM	16	NC
Reset	RST	2	RST	INT	15	NC
Chip Select	EN	3	CS	RX	14	TX	UART TX
	NC	4	SCK	TX	13	RX	UART RX
	NC	5	MISO	SCL	12	NC
	NC	6	MOSI	SDA	11	NC
Power Supply	3.3V	7	3.3V	5V	10	NC
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

WiFi 3 Click electrical specifications

Software Support

We provide a library for the wifi3 Click as well as a demo application (example), developed using Mikroe compilers. The demo can run on all the main Mikroe development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager (recommended), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for wifi3 Click driver.

Key functions

• Checking module and initializes connection with network, starts web server

• This function sends AT commant to wifi3 click, logs sent and received data.

• This function reads data received from Wifi3 click.

Example Description

This example initializes wifi connestion to a network and starts web server, writes "MikroeE - Wifi3" to the client web application (for example web browser).

 void application_task ( void ) 
 { 
     uint8_t str[ 100 ] = { 0 }; 

     strcat( str , page_begin ); 
     strcat( str, "MikroE - Wifi3" ); 
     strcat( str , page_end ); 

     wifi3_read( &wifi3 , r_buf ); 
     wifi3_send_cmd( &wifi3 , &logger , &WIFI3_SEND , "0,34" ); 
     Delay_ms( 500 ); 

     wifi3_generic_write( &wifi3 , str , strlen( str ) ); 
     Delay_ms( 500 ); 
 }

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager (recommended), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.wifi3

Additional notes and informations

Depending on the development board you are using, you may need USB UART click, USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. UART terminal is available in all Mikroe compilers.

mikroSDK

This Click board™ is supported with mikroSDK - Mikroe Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.

For more information about mikroSDK, visit the official page.