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This time around he’s opted to use the ESP8266 WiFi module instead of a Bluetooth one. ... you can check out his original foray into Leap Motion Arduino control here.
Just like Amazon’s voice-control automation, ... The Arduino IDE is used to program an ESP8266, and there are plenty of MQTT sketches out there that may be used for this purpose.
For this example during a session of Sunday night hacking an Adafruit ESP8266 Feather HUZZAH is used to control NeoPixels or a relay. In short, no external server, gateway, service, computer ...