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Wemos D1 mini ESP8266

Regular price £8.00

Wemos D1 mini is like a "little Arduino with wifi" for a great price. It's based around the ESP8266, has one analogue port and 11 digital ports. It's programmed via micro-USB (or remote flash via wifi). You can use it with the Arduino IDE, micropython or NodeMCU.

It runs from 5V or 3.3V. Logic levels are 3.3V for all ports. 

If you use the Arduino IDE, there are a lot of example sketches already provided. This makes life relatively easy to be able to do what you want.

I use these to read temperatures in various locations and send the data to a Raspberry Pi  web server via wifi.

They work well with TMP36, DS18B20, RasPiO InsPiRing RGB LEDs, PIR motion sensors, BME280 barometric pressure/temperature/humidity sensors

Tutorials

Documentation

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
Length 34.2mm
Width 25.6mm
Weight 10g
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