No installs, IDE or compiler needed, so you can use it on any computer, even ChromeBooks or computers you can't install software on. Edit code.py with your favorite text editor to build your wireless-enabled project using Python, the most popular programming language. When you plug it in, it will show up as a very small disk drive with code.py on it. The most exciting part of the ItsyBitsy is that while we ship it with an Arduino IDE compatible demo, you can also install CircuitPython on board with only a few clicks. It even comes with 2MB of QSPI Flash built in, for data logging, file storage, or CircuitPython code. So it's great for thse really compact builds.

It's the same chip as the Feather nRF52840 but really really small. ItsyBitsy nRF52840 Express is only 1.4' long by 0.7' wide, but has 6 power pins, 21 digital GPIO pins (6 of which can be analog in).

Teensy & powerful, with an fast nRF52840 Cortex M4 processor running at 64 MHz and 1 MB of FLASH - this microcontroller board is perfect when you want something very compact, with a heap-load of memory and Bluetooth LE support This Itsy is your best option for tiny wireless connectivity - it can act as both a BLE central and peripheral, with support in both Arduino and CircuitPython What's smaller than a Feather but larger than a Trinket? It's an Adafruit ItsyBitsy nRF52840 Express featuring the Nordic nRF52840 Bluetooth LE processor!

Adafruit trinket 5v keyboard