These cat ears from marycheungisme on Hackster.io are simply purrfect!
It was really a tough but fun experience to go through, and we made it at last. It is the result of this experiment: Based on Arduino platform, through code control and hardware construction, our project has three modes for the cat ears hairpin, uses heart rate sensor to measure heart rate and ultrasonic sensor to measure distance, makes the equipment wearable through welding circuit and external power supply, and makes it more beautiful by making plush appearance.
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.