WeMos D1 Pro Mini ESP8266 Development Board with CP2104 and External Antenna Connector

WeMos D1 Pro Mini ESP8266 Development Board with CP2104 and External Antenna Connector
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  • Product Code:SQ6556
  • Availability: 1000
  • $3.15
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Tags: WeMos D1 Pro Mini, ESP8266 development board, CP2104 USB UART, external antenna ESP8266, D1 Mini Pro, ESP8266EX, Arduino WiFi board, IoT development board, U.FL antenna connector, 3.3V ESP8266

The WEMOS-Pro module is a compact ESP8266-based development board designed for Internet of Things (IoT) projects, data logging, and Arduino-compatible wireless applications. Built around the ESP8266EX microcontroller, this board integrates Wi-Fi connectivity with a CP2104 USB-to-serial converter, allowing direct programming and serial communication over a Micro USB connection. The board operates with 3.3V logic levels and provides 11 digital input/output pins along with one analog input (ADC), supporting interfaces including GPIO, UART, I2C, HSPI, and PWM.

A distinguishing feature of D1 Pro Mini 4MB flash is its dual antenna arrangement: a built-in ceramic antenna for general use and a U.FL (IPEX) connector for attaching an external antenna to extend wireless range. To activate the external antenna, a zero-ohm (0Ω) SMT resistor on the board must be moved from the internal antenna position to the external antenna position. This makes the board particularly suitable for installations where the onboard antenna is obstructed or where greater Wi-Fi reach is required.

The board is compatible with the Arduino IDE and supports AT commands, cloud server connectivity, and development kits (SDK). With a default baud rate of 115200bps (configurable from 300 to 4608000 baud) and a supply voltage of 5V DC (working voltage 3.3V), the WEMOS-Pro module is an accessible platform for wireless sensor nodes, home automation controllers, and IoT prototyping.

WeMos D1 Pro Mini ESP8266 Application

  1. Internet of Things (IoT) sensor nodes and gateways
  2. Data logging systems with Wi-Fi connectivity
  3. Home automation and smart device controllers
  4. Wireless sensor networks and telemetry
  5. Arduino-compatible Wi-Fi prototyping
  6. Remote monitoring and cloud-connected devices
  7. Battery-powered or portable Wi-Fi projects
  8. Installations requiring an external antenna for extended range

WeMos D1 Pro Mini ESP8266 Specifications

  1. Product Model: WEMOS-Pro module
  2. Core Microcontroller: ESP8266EX
  3. Clock Speed: 80 MHz (up to 160 MHz)
  4. Operating Voltage (Logic): 3.3V DC
  5. Supply Voltage: 5V DC (via Micro USB)
  6. Current Consumption: > 400 mA
  7. Digital I/O Pins: 11
  8. Analog Input Pins: 1 (ADC)
  9. Interfaces: GPIO, UART, I2C, HSPI, PWM
  10. USB-to-UART Converter: CP2104
  11. Flash Memory: 4 MB (per Aftab Rayaneh) / 16 MB (typical for D1 Mini Pro)
  12. Default Baud Rate: 115200 bps (configurable 300–4608000 bps)
  13. Built-in Antenna: Ceramic antenna
  14. External Antenna Connector: U.FL (IPEX)
  15. Antenna Switching: 0Ω SMT resistor (move to activate external antenna)
  16. Onboard LED Indicator: D4 (GPIO2)
  17. Wi-Fi Standard: IEEE 802.11 b/g/n (2.4 GHz)
  18. Wi-Fi Modes: STA / AP / STA+AP
  19. Security: WEP / TKIP / AES / WPA / WPA2
  20. Programming Compatibility: Arduino IDE
  21. AT Command Support: Yes
  22. Board Dimensions: 34.2 mm × 25.6 mm
  23. Weight: Approximately 2.5–3 g

Features

  1. ESP8266EX microcontroller with integrated Wi-Fi (IEEE 802.11 b/g/n)
  2. CP2104 USB-to-UART converter for reliable programming and serial communication
  3. Dual antenna design: built-in ceramic antenna plus U.FL external antenna connector
  4. Zero-ohm SMT resistor for switching between internal and external antenna
  5. 11 digital I/O pins with interrupt, PWM, I2C, and one-wire support
  6. One analog input (ADC) for sensor measurements
  7. Arduino IDE compatibility for rapid development
  8. Support for AT commands, cloud servers, and development kits (SDK)
  9. Configurable baud rate from 300 to 4608000 bps (default 115200 bps)
  10. 3.3V logic level operation with 5V Micro USB supply
  11. Onboard LED indicator on pin D4 (GPIO2)
  12. Compact board dimensions of 34.2 mm × 25.6 mm and lightweight 2.5–3 g design
  13. Supports STA, AP, and STA+AP Wi-Fi operating modes
  14. Suitable for IoT data loggers, home automation, and wireless sensor projects
Electrical Parameters
Frequency 2.4GHz
Voltage 5V From Micro USB or 5V Pin
Physical Parameters
Size 34.2mm x 25.6 mm

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