MakeKontakt is a switch for smart lights, where you swipe up/down to turn lights on or off and left/right to select a different light to control. Up to five individual lights or light groups are supported. Gestures are confirmed by animations on a ring of RGB LEDs for a natural user experience. MakeKontakt connects locally over wifi straight to your smart light system and has been primarily developed for the Philips Hue. However it can talk other protocols as well: LiFx, Yeelight and WiZ.
A single button on the back is used for connecting the device to your wifi network.
MakeKontakt is also an Arduino-compatible development platform based on the ESP8266. Apart from the wifi module it features the Broadcom APDS-9960 gesture sensor, WS2812 addressable LEDs and a CH340 USB to UART bridge all packed on a ~5cm diameter round PCB. You can use it for a remote status display for your CPU usage, an IFTTT trigger or even make a simple gesture game out of it.