New Wemos D1 mini Pro 16MB, Wemos XI and Shield SHT30

wemos d1 mini pro new top side
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Wemos continues to develop the mini D1. The Wemos D1 mini Pro comes to expand the family. It is always built around an ESP8266EX but this time with 4 times more memory (16Mbytes) than the previous version. Wemos headed on compactness with this new generation of board ESP8266 by incorporating a ceramic antenna.

Introducing the new Wemos D1 Mini Pro

Wemos D1 Mini Pro is built around an ESP8266EX of Espressif (datasheet file). It’s the same circuit as the previous generation, flash memory from 4 to 16 Mbytes. The used components are more compact. They are all welded on the top side of the board. Note the disappearance of the shield usually present around the ESP8266 module, allowing to make the finest board. Instead, the board is now equipped with a ceramic antenna instead of engraved on the PCB antenna. If the scope is still not sufficient for your project, it is possible to add a external antenna thanks to a dedicated connector (IPEX) present next to the ceramic antenna.

Wemos D1 MiniWemos D1 Mini Pro
wemos d1 mini dessuswemos d1 mini pro dessus top
wemos d1 mini dessous bottomwemos d1 mini pro dessous bottom

Photos :

The Pro abandons the CH340G serial/USB bridge for the benefit of the CP2104. The drivers are available on this page for Windows (XP, 7, 8, 10, 2000), Linux, Android and macOS.

Technical characteristics

The number and characteristics of the inputs/outputs are always the same and the number 11 (more an analog input). The main technical features of the Pro:

  • antenne ipex wemos d1 mini pro11 digital I/O
  • Interruption/pwm/I2C/one-wire: available on all pins except the D0
  • 1 analog input, limited to a voltage of 3.2V Max
  • 16 M bytes (128 M bit) memory Flash
  • IPEX connector for WiFi antenna external
  • Integrated ceramic antenna
  • New CP2104 serial/USB converter
  • CPU frequency : 80 MHz / 160 MHz
  • Dimensions: 34.2 mm x 25.6 mm (thinner than the previous version)
  • Weight: 2, 5 g

Identification of the pins

The pins remain the same from the previous generation.

PinFunctionMatch ESP8266
A0Analog input, max 3.3V inputA0
D3IO, 10 k pull-upGPIO0
D4IO, 10 k pull-up, BUILTIN_LEDGPIO2
D8IO, 10 k Pull-down, SSGPIO15

The Wemos D1 Mini pro is compatible with all existing shields (expansion boards).A new Shield made my entry to the catalog, the SHT30. More compact than the DHT11/DHT22, this shield is integrated a SHT30 of society Sensirion sensor (datasheet here). It allows to perform measurements of temperature and humidity with a good precision (±3% RH and ±0.3 ° C). The sensor uses the I2C bus to send measures (2 addresses). A code example is available on GitHub. We can find this new shield about €2.85 in Asia.

Check shipping cost before buyingPIN
esp8266 Wemos D1 miniESP8266 Wemos D1 Mini board

From $3.50 to $5

chargeur raspbery pi 3 5v 3000ma5V/3A micro-usb power supply

The ESP8266 is sensitive to the quality of the power supply (risk of crash). A good quality power supply is recommended.

wemos d1 mini shield batterie lipoLiPo battery charger with micro USB connector.

About $2.20

wemos d1 mini relai shieldRelai (1 output)

About $1.20

wemos d1 mini one button shield1-Button

About $0.60

wemos d1 mini dht11 shieldDHT11 (not official shield): temperature / humidity sensor (read this tutorial)

About $2.70

Adafruit library :

wemos d1 mini dht22 shieldDHT22 (not official shield): temperature / humidity sensor. Tutorial : presentation of the shield, how to use with ESP Easy and Arduino code

About $2.80

Adafruit library :

wemos shield sht30 sensirion temperature himidite 1SHT30: temperature and humidity sensor on I2C bus

About $2.3

Librairy and example on GitHub

D1 – SCL

D2 – SDA

wemos d1 mini oled shieldI2C SSD1306 monochrome OLED Display. How to use SSD1306 OLED display

About $4

D1 – SCL

D2 – SDA

wemos d1 mini microsd shieldMicro SD board reader (ideal for making a mini data logger)

About $1

wemos d1 mini proto shieldBreadboard

About $0.90

wemos d1 mini dual baseDouble base. Lets you install a Wemos on a slot (and overlay a shields). A 2nd location allows to install a 2nd shields.

About $1

wemos d1 mini motor shield i2cI2C Driver to drive 2 motors (15 VDC max.)

About $2.50 (without shipping cost)

D1 – SCL

D2 – SDA

wemos d1 mini shield dc powerDC Power 7-24VDC (1A max)

About $1,4

wemos shield rbg led ws2812b adafruit neopixel libraryD2

All specials for Wemos official shields

Bonus : Wemos XI

It would be almost went unnoticed, the Wemos XI (€1.45) is a small clone of the Arduino Nano designed around a LGT8F328D chip. Here are some technical features:

  • Working voltage: 1.8 – 5.5 V
  • Flash memory: 32 KB
  • CPU frequency: 16 MHz
  • 8 x ADC
  • 2 x DAC

To program it will take if equipped with a FTDI (USB to serial) cable.


Wemos continues to offer innovative and performing boards with this version Pro. However no need to invest in this new board if you have a project object connected to the base of the firmware ESP Easy . That’s a shame, but limit development team (yet) the size of the firmware to 512kb for compatibility with the first ESP8266 boards, except to compile you even your firmware. In this case, follow this tutorial . On the contrary, if you have a greedy project in memory or need to use an external antenna to connect to a distant WiFi network, this new board is a great choice.

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