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WeMos D1 Mini Pro ESP8266 Development Board (HCWEMO0002) 
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Post WeMos D1 Mini Pro ESP8266 Development Board (HCWEMO0002)

The WeMos D1 mini PRO is a miniature wireless 802.11 (Wifi) microcontroller development board. It turns the very popular ESP8266 wireless microcontroller module into a fully fledged development board. Programming the D1 mini pro is as simple as programming any other Arduino based microcontroller as the module includes a built in microUSB interface allowing the module to be programmed directly from the Arduino IDE (requires the ESP8266 support to be added via board manager) with no additional hardware.

The D1 mini Pro is also designed to allow Wemos compatible shields to be plugged into the board in a similar way to the Arduino development board platform, which greatly expands its capabilities. There is already a large range of compatible shields available and these can also be purchased via our website. Included with the module is a set of headers (requires soldering) that allow this shield to be easily added or removed from the D1 mini PRO.

Other features of the D1 Mini Pro include 11 digital input/output pins, 1 analogue input pin (3.2V Max), 16MB (128M bit) Flash, an external antenna connector, built in ceramic antenna and houses the new CP2104 US to UART IC. The D1 Pro is the same size as the D1 mini, but is lighter.

To quickly get going we have provided an Arduino setup guide on our blog site here:



Operating Voltage: 3.3V
Digital I/O Pins: 11
Analogue Pins: 1 (Max input 3.2V)
Clock Speed: 80MHz/160MHz
Flash: 16MB


Length: 34.2mm
Width: 25.6mm
Weight: 2.5g


Example Arduino Blink Sketch:

/* Blink example - */
#include <ESP8266WiFi.h>
#define PIN 2 // Flash the LED connected to GPIO2
void setup()
pinMode(PIN, OUTPUT); // Set the pin to an output
void loop()
digitalWrite(PIN, LOW); // Turn the LED on
delay(1000); // Wait for a second
digitalWrite(PIN, HIGH); // Turn the LED off
delay(1000); // Wait for another second


The Wemos D1 mini pro includes the Silicon Labs CP2104 USB to UART IC to allow it to programmed directly from the USB port of a computer. The latest VCP drivers for various operating systems can be downloaded from the Silicon Labs website here: ... ivers.aspx




Does anything need to be done to switch between the built-in antenna and an external one?

Yes, there is a 0 ohm resistor (small black rectangular device marked with a 0). It's situated between the chip antenna and the uFL connector. In its default position it links the output antenna path from the IC to the built in chip antenna. This needs to be moved to the external antenna position.

Disclaimer: Libraries, example code, and diagrams are provided as an additional free service by Hobby Components and are not sold as part of this product. We do no provide any guarantees or warranties as to their accuracy or fitness for purpose.

Descriptions and diagrams on this page are copyright Hobby Components Ltd and may not be reproduced without permission.

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Mon Nov 21, 2016 4:26 pm
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