There are at least two different ways you can configure this circuit board. Version A has components soldered in the appropriate locations so that it will work as an Arduino shield. Version B is configured to be a “daughter card” it also has a socket for an Arduino shield. This way you can mount at least three Arduino shields on to one Arduino. You can also reconfigure the pins to avoid conflicts between the different shields. Oh yeah you can also pop a little solderless bread board in the center. There seems to be plenty of room it and it does not seem interfere with any shields that I have attached.
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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.