The Feather [M0] development boards have so much going for them with a beefy 32-bit processor running at a respectable clock speed (48 MHz) that is also loaded with storage (256k flash + 32k ram). The best part about using these boards is that the code running on them can be executed in full debug mode. A gdb client can be used to stop, step, and print values of variables. Adafruit’s latest tutorial will walk you through the Feather M0 setup for JTAG debugging on OS/X.
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.