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Using the very classic 74HC595, this shield gives you 64 pins of digital output while only using three digital pins on your Arduino.
https://www.adafruit.com/products/377
The mama shield is a kind of “motherboard”that lets you connect multiple shields to an Arduino.
Arduino Leonardo 100% compatible
Extremely Accurate I2C Real Time Clock with integrated crystal.
Doomsday Clock Shield Prepare for the end of the world and learn about programming seven segment LEDs by Charlieplexing all at the same time.
Extremely useful breadboard jumper wires.
The PCB used for the Mama Shield can also be assembled as a card with an Arduino socket, thus we have "Mama Shield Card". This way you can stack about three Arduino shields on one Arduino.
These are some of the best red green blue LEDs I have found.
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