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ESP8266 is a very popular Wi-Fi-enabled microcontroller. Thanks to a very attractive price and huge possibilities quickly became a very popular choice - especially in the domain of home automation. However bare ESP8266 is a bit tricky for beginners.
Wemos D1 mini solves all those inconveniences. Basically, it's very similar to the NodeMCU module. The main difference is size. Wemos D1 is smaller and has a newer version of the wifi module - 12F. More stable and with a better range. D3 to G and reset button to enter bootloader mode
D1 Mini NodeMCU 4MB Specification:
Pin Out:
Resources:
NodeMCU