New Wemos: D1 mini Pro, Wemos XI, Shield SHT30 [Exclusive Guide]

11:46 pm November 15, 201612698

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 card ESP8266 by incorporating a ceramic antenna.

Wemos D1 Mini Pro is so built around an ESP8266EX of Espressif ( data sheet). 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 card. Note the disappearance of the shield usually present around the ESP8266 module, allowing to make the finest card. Instead, the card 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 Mini Wemos D1 Mini Pro
on on
wemos d1 mini dessus wemos d1 mini pro dessus top
under under
wemos d1 mini dessous bottom wemos d1 mini pro dessous bottom


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

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:

  • 11 antenne ipex wemos d1 mini pro trees/output digital
  • Interruption/pwm/I2C/one-wire: available on all pins except the D0
  • 1 input analog, limited to a voltage of 3.2V Max
  • 16 M bytes (128 M bit) memory Flash
  • connector IPEX for WiFi antenna external
  • integrated ceramic antenna
  • new series-USB CP2104 converter
  • frequency CPU: 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.




pin on the map match ESP-8266
A0 Analog input, max 3.3V input A0
D3 IO, 10 k pull-up GPIO0
D4 IO, 10 k pull-up, BUILTIN_LED GPIO2
D8 IO, 10 k Pull-down, SS GPIO15
5V 5V
3V3 3.3V 3.3V

the Wemos D1 Mini pro is compatible with existing (Shields) expansion cards.

esp8266 Wemos D1 mini map ESP8266 Wemos D1 Mini

from €2.90 in Asia (delivery between 3 to 5 weeks). About € 8 from Europe .

wemos d1 mini shield batterie lipo charger for LiPo battery with micro USB connector

€ 2.20

wemos d1 mini relai shield relay 1 output

about € 3.2

wemos d1 mini one button shield 1-Button, button connected

£ 1.95

wemos d1 mini dht11 shield Temperature / humidity using a DHT11 ( see the article on this) sensor )

€ 2.70

Bookstore Adafruit:

wemos d1 mini dht22 shield Temperature / humidity using a DHT22 ( see the article on this sensor )

about €6,40

Bookstore Adafruit:

wemos d1 mini oled shield screen OLED. Complete Guide on libraries to use an OLED display

€ 4.40

wemos d1 mini microsd shield card reader micro SD (ideal for making a data recorder mini)

€ 2.60

wemos d1 mini proto shield Platinum prototyping

€ 0.70

wemos d1 mini dual base double basis. Allows to install a Wemos on a location (and to superimpose a shields). A 2nd location allows to install a 2nd shields.

About €0.95

wemos d1 mini motor shield i2c I2C Driver to drive 2 Motors (15 VDC max.)

About € 4.60

antenne ipex wemos d1 mini pro external antenna with connector IPEX

€ 1.15 (2dBi)

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 ( data sheet). 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 pass measures (2 addresses). A code example is available on GitHub . We find this shield about €2.85 in Asia.


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
  • frequency CPU: 16 MHz
  • 8 x ADC
  • 2 x DAC

to program it will take if equipped with a USB cable / series .

Wemos continues to offer innovative and performing cards with this version Pro. However no need to invest in this new card 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 cards, 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 card is a great choice.