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This is D1 mini, a mini WiFi board based on ESP-8266EX. How to start using Ar duino? Please read the document carefully. The document link is

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Top 10 WeMos D1 Mini Board Accessories (ESP8266) - Maker Advisor

MELIFE 2pcs Wemos D1 Mini V3.0 Development Board ESP8266 V3.0.0 4MB Flash Wireless WiFi Internet Development Board Based ESP8266 CH340 CH340G for Nodemcu V2 MicroPython : Everything Else

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Compatible with MicroPython, Nodemcu. WIFI module 4MB Internet of Things based on ESP8266 compatible. New V3.0.0 Version now add deep sleep jumper

2pcs Wemos D1 Mini V3.0 Development Board ESP8266 V3.0.0 4MB Flash Wireless WiFi Internet Development Board Based ESP8266 CH340 CH340G for Nodemcu V2