What do you do when your microcontroller doesn’t have enough pins? Learn how to use the CD4094 output-type shift register and the CD4021 input-type shift register to control LEDs and read out the status of pushbuttons, and all of that with only three wires.
In six steps, learn all about the CD4094 output-type shift register, the CD4021 input-type shift register, and how to use them with a microcontroller. And in the end, put it all to use with an SNES game controller, which—you guessed it—also uses shift registers on the inside.
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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.
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