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