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NodeMCU is the ideal module for Internet of Things (IoT).
It combines WiFi connectivity with the versatility of Arduino.
Has 9 digital IO pins out of wich 8 are PWM capable and one input analog pin.
It's based on the ESP8266 chip running at 26 Mhz, with 4 MB flash and 160 KB RAM (specs)
By default, the firmware allows running LUA scripts but it can be easily adapted to run Arduino code: link
Control a led from the Internet: link
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Reference: YLQZWI_KIT-IR
Reference: GIWFVW_ESP2866-07
Reference: ETZPMN_RPI_RELAY8
Brand: Raspberry Pi
Reference: LOKWHW_433-pair
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