ESP8266 D1 R2 WiFi Board — Arduino Uno Footprint

ESP8266 D1 R2 WiFi Board — Arduino Uno Footprint

The ESP8266 D1 R2 combines the power of the ESP8266 WiFi microcontroller with the familiar Arduino Uno form factor — making it a drop-in replacement for Arduino Uno shields while adding built-in 802.11 b/g/n WiFi. Program it directly from the Arduino IDE using the ESP8266 board package, and use most existing Arduino Uno shields without modification.

Key Specifications

• MCU: ESP8266EX (ESP-12F) | Clock: 80MHz (up to 160MHz)
• Flash: 4MB | WiFi: 802.11 b/g/n
• Digital I/O: 11 pins | Analog in: 1 (10-bit)
• Interfaces: UART / SPI / I2C | USB: Micro USB (CH340)
• Form factor: Arduino Uno compatible | Shield compatible: Yes
• Operating voltage: 3.3V | Input: 5V via USB or DC jack
• IDE: Arduino IDE compatible | Compliance: RoHS compliant

Why Choose This?

• ✅ Arduino Uno footprint — use existing Arduino Uno shields directly
• ✅ Built-in WiFi — no separate WiFi shield needed
• ✅ Arduino IDE compatible — familiar development environment
• ✅ 4MB flash — ample space for OTA updates and SPIFFS file system

Typical Applications

• Arduino Uno projects requiring WiFi connectivity
• Home automation with existing Arduino shields
• WiFi-connected sensor and actuator projects
• IoT prototyping with Arduino shield ecosystem

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