WiFi ESP click

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  • MIKROE-2542
  • MIKROE-2542
WiFi ESP click  carries the  ESP-WROOM-02  module that integrates ESP8266EX. The... more
Product information "WiFi ESP click"

WiFi ESP click carries the ESP-WROOM-02 module that integrates ESP8266EX. The click is designed to run on a 3.3V power supply. It communicates with the target microcontroller over UART interface and the following pins on the mikroBUS™ line: RST, CS.

Access point and WiFi client mode

WiFi ESP click can function in both AP (Access Point) WiFi mode, as well as in WiFi client mode. The click brings easy implementation and usage.

The module supports the following network protocols: IPv4/TCP/UDP/HTTP/FTP. Thanks to this the click can operate as a client device requesting a file from a file server device (FTP - file transfer protocol) in local network systems, or request a web page via internet (IP/TCP/HTTP). It can also be used as a small web server, for example a wireless weather station prototype, etc. 

Station mode is default when the click is in WiFi client mode.

ESP-WROOM-02 module features

ESP-WROOM-02 carries ESP8266EX highly integrated Wi-Fi SoC solution to meet the continuous demands for efficient power usage, compact design and reliable performance in the industry.

Besides the Wi-Fi functionalities, ESP8266EX integrates an enhanced version of Tensilica’s L106 Diamond series 32-bit processor and on-chip SRAM. As well as antenna switches, RF balun, power amplifier, low noise receiver amplifier, filters and power management modules.

With the complete and self-contained Wi-Fi networking capabilities, it can perform as either a standalone application (WROOM module itself) or the slave to an MCU host which is the primary intention of the click board as a whole. So, this click board is applied to any microcontroller design as a Wi-Fi adaptor through UART interface (RX,TX lines on mikroBUS pin socket).

For more information see the datasheet.

Advanced usage

There are additional pad headers onboard (HSPI/GPIO interface of the module) for advanced usage.

For more information see the Documentation tab.


Type Wi-Fi
Applications Create smart appliances, home automation systems, wireless data loggers, etc
Key Features Protocols: IPv4, TCP/UDP/HTTP/FTP, 802.11 b/g/n standard, UART interface, 3.3V power supply
Key Benefits The click can function in both AP mode and WiFi client mode
Interface GPIO,UART
Input Voltage 3.3V
Compatibility mikroBUS
Click board size M (42.9 x 25.4 mm)

Pinout diagram

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

NotesPinMikrobus logo.pngPinNotes
  NC 1 AN PWM 16 NC  
HW Reset RST 2 RST INT 15 NC  
Chip enable (active high) EN 3 CS TX 14 TX UART0_TXD / Transmit end in UART download (program) mode
  NC 4 SCK RX 13 RX UART0_RXD / Receive end in UART download (program) mode
  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

Additional pins

IO0 IO GPIO0 (UART download mode - pull down, Flash boot - pull up)

Buttons and LEDs

DesignatorNameType (LED, BUTTON…)Description
LD1 PWR LED Power Supply ON


Code examples for WiFi ESP click, written for MikroElektronika hardware and compilers are available on Libstock.

Code snippet

This code snippet configures GPIO ports, initializes the display and prepares the WiFi module. In an endless loop, LED is enabled or disabled by a button, and that information is then sent to the server.

01 void main() {
03   // Initialize variables
04   length = 0;
05   state = 0;
06   response_rcvd = 0;
07   responseID = 0;
08   response = 0;
09   i = 0;
11   // GPIO Direction
12   GPIO_Digital_Input( &GPIOA_IDR, _GPIO_PINMASK_4 );
13   GPIO_Digital_Output( &GPIOD_BASE, _GPIO_PINMASK_13 );
14   GPIO_Digital_Output( &GPIOC_BASE, _GPIO_PINMASK_2 );
15   GPIO_Digital_Output( &GPIOA_ODR, _GPIO_PINMASK_0 );
17   // UART Initialization
18   UART3_Init_Advanced( 115200, _UART_8_BIT_DATA,
19                              _UART_NOPARITY,
20                              _UART_ONE_STOPBIT,
21                              &_GPIO_MODULE_USART3_PD89);
23   // Enable Interrupts
24   RXNEIE_USART3_CR1_bit = 1;
25   NVIC_IntEnable( IVT_INT_USART3 );
26   EnableInterrupts();
28   display_init();
30   // Initialize WiFI module
31   WiFi_Init();
33   // Setting WiFi Mode - SoftAP + station mode
34   WiFI_Configure();
36   state = 100;
37   i = 0;
39   TFT_Write_Text("Please connect to your STAIP...", 50, 100);
40   Delay_ms(20000);
41   WiFi3_Send();
42   TFT_Write_Text("Entering button toggling loop.", 50, 150);
44   LED_switching = 1;
46     while( 1 )
47     {
48       // detect logical one on PA4 pin
49       if (Button(&GPIOA_IDR, 4, 1, 1))
50       {
51        oldstate_A4 = 1;
52       }
53       // detect logical one-to-zero transition on PA4 pin
54       if (oldstate_A4 && Button(&GPIOA_IDR, 4, 1, 0))
55       {
56         if ( !strcmp(txt_state_A0, "OFF

" )) 57 { 58 strncpy( txt_state_A0, "ON

", 8 ); 59 GPIOA_ODR.B0 = 1; 60 } 61 else 62 { 63 strncpy( txt_state_A0, "OFF

", 8 ); 64 GPIOA_ODR.B0 = 0; 65 } 66 oldstate_A4 = 0; 67 A0_change = true; 68 WiFi3_Send(); 69 } 70 } 71 }


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