Tiny Microcontrollers

Here's a list of very small microcontrollers, suitable for embedded systems that need computing under the size of a playing card. Most of these are about the size of a quarter or postage stamp.

TRINKET
This is the microcontroller we got from Adafruit a while ago.
Adafruit: www.adafruit.com/product/1501
Amazon: www.amazon.com/Adafruit-Trinket-Microcontroller-Logic-Arduino/dp/B00GEDAC7S
Cost: 7$
Tutorial: learn.adafruit.com/introducing-trinket/introduction

Slightly larger version with more IO
www.amazon.com/Adafruit-Pro-Trinket-3V-12MHz/dp/B00OG5AJCY/

Pros:
Very small, compatible with Arduino IDE, Atmel has a good reputation, low cost, 5V or 3V operation, I2C compatible
Cons:
Unreliable bootloader, gives up certain things due to size (cannot use serial monitor for debugging, no USB3.0 support so must use USB2.0), not much IO, not sturdy easy to fry due to poor diode regulation.


ARDUIONO MICRO
A really small Arduino. We also have a couple of these.
Adafruit: www.adafruit.com/products/1315
Amazon: www.amazon.com/Arduino-A000053-Micro/dp/B00AFY2S56/
Cost ~23$

Pros:
Excellent community, very well reviewed, very stable, powerful for size, comparable with all Arduino specs, lots of IO.
Cons:
Larger and more expensive than alternative chips, 5V only.

ARDUINO PRO MINI
A really really small Arduino. Bout the size of a trinket.
www.sparkfun.com/products/11113?gclid=CKTmr4yzpsMCFUto7Aod7zwAmw
Cost: $10

Pros:
Arduino!
Cons: 
No USB onboard, meant for advanced users

FLORA
A round, sewable microcontroller specifically for wearables. Neat!
Adafruit: www.adafruit.com/products/659
Cost: 20$

Pros:
Round, sewable into fabric with no snags, powerful, lots of Adafruit support (new product they want to prove), beginner-proofed with surge protection, arduino support.
Cons:
Small community (so far), no pin headers, slightly large, not native arduino.

GEMMA
Even tinier version of the flora, but less power.
Adafruit: www.adafruit.com/products/1222
Cost: 8$

Pros:
All the Flora stuff but really tiny. Like the size of a quarter.
Cons:
Shares the Trinket disadvantages - nonnative arduino support, no USB3, and no serial monitor.

TEENSY
A small board with a lot of IO
Sparkfun: www.sparkfun.com/products/12646
Adafruit: www.adafruit.com/product/199

Pros:
Lots of IO, works with USB3
Cons:
Does not natively work with Arduino, requires either an extension (teensyduino) or the Teensy Loader, which is a separate program.




More to come as I find stuff!