A grid is made up of thousands of rows and columns of LEDS. When they come into contact with water, they suddenly light up. The water conducts electricity, forming the missing link in a small electrical circuit. This means that you can paint and draw on the surface of the lights with water. You can use anything to write with – a plant humidifier, a water pistol, a garden hose, a damp paintbrush or your own wet fingers – anything wet will leave a trail of light.
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.