Wemos D1 R1 Wi-Fi ESP8266 Development Board

Arduino-Compatible ESP8266 Wi-Fi Development Board

The Wemos D1 R1 is an ESP8266-based Wi-Fi development board designed in the Arduino Uno form factor, making it a drop-in wireless upgrade for existing Arduino shields and projects. Program it directly from the Arduino IDE with no extra hardware required.

Key Specifications

• CPU: ESP8266 single-core 32-bit, up to 80/160 MHz
• Flash: 4MB SPI Flash
• Wi-Fi: 802.11 b/g/n (2.4 GHz), supports STA / AP / STA+AP modes
• Digital I/O Pins: 11 (all support interrupt, PWM, I2C, one-wire)
• Analog Input: 1 (A0, max 3.3V input)
• Interfaces: SPI, I2C, UART
• USB: Micro USB (CH340G USB-to-UART)
• Operating Voltage: 3.3V logic / 5V USB input
• Form Factor: Arduino Uno compatible

Onboard Features

• Onboard LED (GPIO2)
• Reset button
• Power LED indicator
• Compatible with most Arduino Uno shields

Programming Support

• Arduino IDE (ESP8266 board package)
• MicroPython
• Lua (NodeMCU firmware)

Ideal For

Wi-Fi enabled Arduino projects, IoT sensors, home automation, data logging, and any application requiring wireless connectivity in an Arduino Uno form factor.

Note: Operating voltage is 3.3V. Use level shifters when interfacing with 5V sensors or modules.