The socks work by using an accelerometer to detect when you stop moving for a long period and are likely asleep, then they flash an IR LED to emulate the press of a pause or power button from your remote control. The project page has all the details on building the socks, and you can see quite a few Adafruit breakouts used in the project like an ADXL335 accelerometer, Flora NeoPixel, Pro Trinket & Power Backpack, and more. Nice work!
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, or even use Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for MakeCode, CircuitPython, 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.