The D1 R2 is a development board built around the ESP8266EX microcontroller with advanced WiFi capabilities. It follows the familiar Arduino UNO board format, guaranteeing seamless compatibility with the Arduino IDE and NodeMCU. Its wireless connectivity and compact design make it an ideal choice for Internet of Things (IoT) projects.

Features:

1. Microcontroller (ESP8266EX): The D1 R2 utilizes the ESP8266EX microcontroller, known for its low power consumption and WiFi capabilities. This microcontroller is a key component in enabling wireless communication and connectivity for Internet of Things (IoT) applications.

2. Operating Voltage (3.3V): The board operates at a voltage of 3.3V, ensuring compatibility with the ESP8266EX microcontroller's specifications. This voltage level is common for many microcontrollers and is well-suited for the board's intended applications.

3. Digital I/O Pins (11): The D1 R2 features 11 digital I/O pins, each equipped with a range of capabilities:

   • Interrupt: Allows the microcontroller to respond to external events promptly.
   • PWM (Pulse Width Modulation): Enables the control of analog-like signals, useful for applications like motor control or LED dimming.
   • I2C (Inter-Integrated Circuit): Supports a two-wire communication protocol, facilitating easy integration with various sensors and peripherals.
   • One-Wire: A communication protocol allowing data transfer using a single wire, simplifying connections in certain applications.
   • Note: D0 is an exception and lacks support for these advanced features.
4. Analog Input Pins (1): The board provides 1 analog input pin, allowing the measurement of analog signals. The maximum input voltage for analog signals is 3.2V, providing flexibility for analog sensor interfacing.
5. Flash Memory (4MB): The D1 R2 is equipped with 4MB of flash memory. This storage capacity is crucial for storing program code and data, enabling the implementation of complex applications and the storage of large amounts of information.
6. On-Board Switching Power Supply: The inclusion of a built-in switching power supply is a significant feature. It allows the D1 R2 to be powered from an external source within the voltage range of 9V to 12V. This versatility in power options enhances the board's usability in different scenarios.
7. Output (5V at 1A Max): The switching power supply provides a stable 5V output with a maximum current of 1A. This feature is useful for powering external components and peripherals, expanding the capabilities of the development board.

Specifications:

• Microcontroller: ESP8266EX
• Operating Voltage: 3.3V
• Digital I/O Pins: 11 (all I/O pins have interrupt/pwm/I2C/one-wire capability, except for D0)
• Analog Input Pins: 1 (3.2V max input)
• Flash Memory: 4MB
• On-Board Switching Power Supply
• Input Voltage Range: 9V to 12V
• Output: 5V at 1A Max
• Board Dimensions: 68.6mm x 53.4mm (2.701" x 2.102") / Long x Wide
• Weight: 21.8g (0.769oz)

Note: It's important to be cautious with the voltage levels when interfacing with the D1 R2. As it is a 3.3V device, connecting it to 5V digital sensors or devices requires a logic level converter to ensure proper communication and prevent potential damage.

Pinout:

Package Includes:

 1 x  D1 ESP8266 Development Board