Traffic Light Information System that lets the driver know at which speed he needs to drive in order to pass the green light.

An indoor air quality monitoring system for detecting toxic gases.

With Arduino Home Controller and Amazon Echo dot with Alexa you can handle internet connected devices at home using your voice.

7 IoT platforms (Yeelink, Wechat, ThingSpeak, Temboo, Blynk, DeviceHub and IFTTT) with Arduino Yun to control home appliance

Give a robot arm a variety of tasks with Alexa, including playing with cats!

You can set a message on a dot matrix display by Alexa!