I could have built a simple alarm system any number of different ways, but I knew that I wanted the system to be an all-in-one unit for versatility beyond my son’s original request. I chose the Raspberry Pi as the controller because it is easy to connect to the internet, it can play MP3 files, it interfaces with USB peripherals like cameras, and it has general purpose inputs and outputs for connecting to simple electronic components like buttons, sensors, and lights.
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.