2X ESP8266 Wemos D1 R2 development boards

*These are the actual components in the photo that will be shipped.

Key Components Visible on Your Board

• The Brain (ESP-8266EX): Located under the silver metal shielding on the right side. This chip handles both the processing and the 2.4GHz Wi-Fi connectivity.

• USB-to-Serial Converter: The long IC chip near the Micro-USB port (on the left) handles the communication between the ESP8266 and your computer, allowing you to flash code directly over USB.

• Power Management: It features an onboard 5V and 3.3V voltage regulator. The board can be powered via the Micro-USB port or through the black DC barrel jack (typically accepting 9V to 24V).

2. Core Technical Specifications

Feature Specification

Microcontroller ESP-8266EX

Operating Voltage 3.3V (Note: The I/O pins are not 5V tolerant)

Clock Speed 80 MHz (can be overclocked to 160 MHz)

Flash Memory 4 Megabytes (MB)

Digital I/O Pins 11 pins (all support interrupt/PWM/I2C/one-wire except D0)

Analog Input Pin 1 (Max input: 3.2V)

Wi-Fi 802.11 b/g/n (2.4 GHz)