I dig tiny microcontroller boards. Teensy boards, Arduino Nano boards, SparkFun Pro Micro boards. All of them. I am amazed at the power available in these small packages. Make LED wearables! Create tiny USB devices! Build small smart sensors! Make tiny synthesizers! The new QT Py is my current favorite of this class of devices. It’s also one of the smallest, most capable, and most expandable.
Physically the QT Py is less than 1” square at 20mm×17.5mm, with seven castellated pins on two sides, at 0.1” spacing, for breadboard use. Of these 14 pins, 11 can be analog inputs or digital I/O. Six of the pins can be capacitive touch inputs. One pin has a true analog output as a 10-bit DAC. And of course, there are hardware SPI, I2S, I2C, and serial interfaces available on various combinations of the pins. The QT Py also includes a Stemma QT / Qwiic connector for hooking up the myriad of I2C peripherals offered by SparkFun and Adafruit. On the bottom are pads for an easily-solderable SPI flash chip, enabling you to add 2MB (or more!) of extra storage to the board. This is an officially supported “hack” by Adafruit (they even sell the correct flash chip); it offers a more feature-rich version of CircuitPython if you have the chip installed.
Make: says “”If you need a powerful Arduino-compatible board that’s smaller than a postage stamp and can run CircuitPython or Arduino at an incredible price, the QT Py is a great choice.”
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.