At the top left hand corner of the Pi is a 26 pin header labelled P1. It is here you can get access to logic signals that provide inputs and outputs to the computer.
However, using this involves using some sort of connector. In fact one option is my Buffer Board described here. However, many people might want to access the signals and not want to resort to soldering.
So I have designed this solder-less screw terminal access break out board. This connects to the Pi through a ribbon cable and transfers the signals to labelled screw terminals. There are three versions presented here. One that just transfers the data signals, and two that offer some form of protection for the processor’s GPIO lines.
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.