What's smaller than a Feather but larger than a Trinket? It's an ItsyBitsy! Small, powerful, Arduino-compatible - this microcontroller board is perfect when you want something very compact, but still with a bunch of pins.
ItsyBitsy is only 1.4" long by 0.7" wide, but has 6 power pins, 6 analog & digital pins and 17 digital pins. It packs much of the same capability as an UNO. So it's great once you've finished up a prototype on a bigger Arduino compatible project, and want to make the project much smaller.
The ItsyBitsy 32u4 5V 16MHz uses the Atmega32u4 chip, which is the same core chip in the Arduino Leonardo as well as the same chip we use in our Feather 32u4. It runs at the same speed and voltage of an UNO or Leonardo. So you'll be happy to hear that not only is ItsyBitsy programmable using the Arduino IDE as you already set up, but a vast number of Arduino projects will work out of the box!
Item Specifics
USB bootloader with a nice LED indicator, AVR109 compatible
Micro-USB jack
USB uploading and debugging
On-board 5.0V power regulator with 150mA output capability and ultra-low dropout
Up to 16V input, reverse-polarity protection, thermal and current-limit protection.
Low current 3.3V regulator output
Power: MicroUSB or External Output into VBAT (Battery)
23 GPIO
6 - Analog in
1 - SPI port
1 - I2C port
1 - Hardware Serial port
4 - PWM
Reset button
Size: 35.0mm x 18.0mm x 4.1mm / 1.4" x 0.7" x 0.2"
Weight: 2.6g / 0.1oz