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NodeMCU: a ESP8266 based low cost IoT board | 42 Bots
File:NodeMCU DEVKIT 0.9.JPG - Wikimedia Commons
Wireless Module Ch340/cp2102 Nodemcu V3 V2 Lua Wifi Internet Of Things Development Board Based Esp8266 Esp-12e With Pcb Antenna - Integrated Circuits - AliExpress