# WEMOS D1 Mini Pro ESP8266, WiFi, 16MB, antenna connector

- Page: https://sigmanortec.ro/en/wemos-d1-mini-pro-esp8266-wifi-16mb-antenna-connector
- Price: 39.91 RON
- Availability: In stock; 1-2 zile
- Reference: 88283 · EAN: 5945972489772
- Category: Mechatronics and IoT > Development Board > IoT Development Boards, Wireless
- Specifications: Flash memory: 16 MB; Wireless connectivity: WiFi; Main chip: ESP8266; External antenna connector: Da
- Package (shipping data): 0.012 kg
- Updated: 2026-09-23
- Shop: [Sigmanortec.ro](https://sigmanortec.ro/en/llms.txt)
- Prices: RON, VAT included; prices and stock as of 2026-10-22 04:32 (Europe/Bucharest)

## Description

Compact WiFi development board for IoT projects and automation, based on ESP8266, with 16MB flash for complex firmware and OTA updates, ceramic antenna and U.FL connector for external antenna and better coverage, 11 I/O pins plus analog input, CP2104 USB-to-serial interface, and compatibility with Arduino IDE, MicroPython, NodeMCU, and ESPHome.
The WEMOS D1 Mini Pro board is a compact WiFi development board based on the ESP-8266EX chip, suitable for IoT projects, automation, and wireless applications where space is limited. This version offers 16MB of flash memory, enough for complex firmware, locally stored web pages, and OTA updates, as well as an integrated ceramic antenna together with a U.FL (IPEX) connector for an external antenna, useful when a greater WiFi range is needed.
The board’s main features are an 80 / 160 MHz processor, 2.4GHz 802.11 b/g/n WiFi connectivity, 11 digital I/O pins with support for interrupts, PWM, I2C, and one-wire (except D0), one analog input with a maximum voltage of 3.2V, the CP2104 USB-to-serial converter, and the reset button. All IO pins operate at 3.3V and are not 5V tolerant. I2C communication is available on pins D1 (SCL, GPIO5) and D2 (SDA, GPIO4), while the SPI interface is on pins D5-D8 (SCK, MISO, MOSI, SS). Pin D4 is connected to the board’s built-in LED.
The board is compatible with Arduino IDE, MicroPython, NodeMCU (Lua), and ESPHome, and the D1 mini form factor allows direct mounting of shields from this family (sensors, relays, displays, power modules). Power is supplied through the Micro-USB port or via the 5V pin.
Specifications:
Chip: ESP-8266EX
USB-to-serial converter: CP2104
Flash memory: 16 MB (128 Mbit)
Processor frequency: 80 / 160 MHz
WiFi: 2.4GHz, 802.11 b/g/n
Supply voltage: 5V (Micro-USB or 5V pin)
Operating voltage: 3.3V (IO pins at 3.3V)
Digital pins: 11 (interrupt, PWM, I2C, one-wire, except D0)
Analog input: 1 (maximum 3.2V)
Antenna: integrated ceramic + U.FL/IPEX connector for external antenna
Port: Micro-USB
Compatibility: Arduino IDE, MicroPython, NodeMCU, ESPHome, D1 mini shields
Dimensions: 34.2 x 25.6 mm
Weight: 2.5 g
Layout:
Pin
Function
ESP-8285 Pin
TX
TXD
RX
RXD
A0
Analog input, max. 3.2 V
A0
D0
I/O
GPIO16
D1
I/O, SCL
GPIO5
D2
I/O, SDA
GPIO4
D3
I/O, 10 kΩ pull-up resistor
GPIO0
D4
I/O, 10 kΩ pull-up resistor, built-in LED (BUILTIN_LED)
GPIO2
D5
I/O, SCK
GPIO14
D6
I/O, MISO
GPIO12
D7
I/O, MOSI
GPIO13
D8
I/O, 10 kΩ pull-down resistor, SS (Slave Select)
GPIO15
G
Ground (GND)
GND
5V
5 V power supply
–
3V3
3.3 V power supply
3.3 V
RST
Reset
RST
Usage:
Install the Silicon Labs CP210x driver if the operating system does not automatically recognize the board.
Connect the board to the computer using a data Micro-USB cable (not just a charging cable).
In Arduino IDE, add the address https://arduino.esp8266.com/stable/package_esp8266com_index.json in Preferences and install the esp8266 package from Boards Manager.
Select the "LOLIN(WEMOS) D1 mini Pro" board, the corresponding COM port, and the 16MB flash size.
Upload the desired program and open Serial Monitor at 115200 baud for verification.
Do not apply voltages higher than 3.3V to the IO pins or higher than 3.2V to pin A0.
Avoid pulling pins D3 and D4 to GND or pin D8 to 3.3V at startup, as these determine the boot mode.
For the external antenna, check the position of the 0-ohm resistor on the board that selects the ceramic antenna or the U.FL connector, connect the antenna, and move the resistor if necessary.
Dimensions diagram: