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Doomsday Clock Shield
Prepare for the end of the world and learn about programming seven segment LEDs by Charlieplexing all at the same time.
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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.
The mama shield is a kind of “motherboard”that lets you connect multiple shields to an Arduino.
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.
Extremely Accurate I2C Real Time Clock with integrated crystal.
Arduino Leonardo 100% compatible
This is your basic Arduino, but not too basic. It still has a USB port. For me the Duemilanove is the best Arduino ever made. For somebody who is new to Arduino this is the one I would recommend.
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