Wemos D1 R2 AB143 Wi-Fi Development Board WMOD1

Description

The WEMOS D1 R2 (AB143) is a development board built around the ESP8266EX Wi‑Fi microcontroller, designed in the familiar form factor of an Arduino UNO. It’s perfect for hobbyists and IoT developers who want to combine the UNO layout with wireless connectivity—programmable via the Arduino IDE or NodeMCU.

Key Features:-

ESP8266EX controller offers an 80 MHz CPU (up to 160 MHz Turbo), integrated TCP/IP stack, and onboard Wi‑Fi.

UNO-compatible layout with standard headers, allowing use of many Arduino shields

WEMOS D1 R2 AB143

USB-to-serial interface via CH340G chip, allowing easy plug-and-play programming over Micro-USB

Power flexibility: onboard switching regulator supports 9–24 V DC input, delivering 5 V at 1 A and stable 3.3 V for the ESP8266

Wireless OTA updates supported, enabling over‑the‑air firmware uploads

Multiple communication options: I²C, SPI, UART, PWM, interrupts, and one‑wire on all but D0 pin

Shield compatibility note: All I/O runs at 3.3 V, not 5 V—careful when connecting 5 V shields

Specifications:

Microcontroller  ESP8266EX (32-bit RISC, 80 MHz standard, 160 MHz turbo)

Flash Memory 4 MB  Digital I/O  11 pins (supports interrupt/PWM/I²C/1‑wire; D0 lacks interrupt)

Analog Input 1 × A0 (max 3.2–3.3 V)  Operating Voltage 3.3 V logic; 5 V regulator from USB or jack

Power Input 9–24 V DC via barrel jack Onboard Power Regulation  5 V @ 1 A via switching regulator; followed by 3.3 V LDO