Wemos d1 mini hardware

Recently I purchased a Wemos D1 board, when I was browsing around recently I noticed that they also had a mini version. If you know your Arduino boards then this would be similar to the Arduino Nano. Here is a picture I took of one alongside an Arduino Nano

 

Wemos and Arduino nano
Wemos and Arduino nano

As you can see its nice and compact for any projects where space is an issue. Another great feature for ease of development is the ability to use the Arduino IDE or NodeMCU. this means you can get up and running quickly. The pin headers are located in a sensible layout, so it looks easy to create your own basic shields for the board

Lets look at some basic specs, the operating voltage and the input voltage to Analog are critical, remember this is a 3.3v board

Microcontroller ESP-8266EX
Operating Voltage 3.3V
Digital I/O Pins 11
Analog Input Pins 1(Max input: 3.2V)
Clock Speed 80MHz/160MHz
Flash 4M bytes

Here are the pin functions

Pin Function ESP-8266 Pin
TX TXD TXD
RX RXD RXD
A0 Analog input, max 3.3V input A0
D0 IO GPIO16
D1 IO, SCL GPIO5
D2 IO, SDA GPIO4
D3 IO, 10k Pull-up GPIO0
D4 IO, 10k Pull-up, BUILTIN_LED GPIO2
D5 IO, SCK GPIO14
D6 IO, MISO GPIO12
D7 IO, MOSI GPIO13
D8 IO, 10k Pull-down, SS GPIO15
G Ground GND
5V 5V
3V3 3.3V 3.3V
RST Reset RST

 

So to summarise, the Wemos D1 mini has

  • 11 digital input/output pins, all pins have interrupt/pwm/I2C/one-wire supported(except D0)
  • 1 analog input(3.2V max input)
  • a Micro USB connection
  • Compatible with Arduino
  • Compatible with nodemcu

 

Links

You can pick up one of these from about $5
D1 mini – Mini NodeMcu 4M bytes Lua WIFI Internet of Things development board based ESP8266 by WeMos

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