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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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Extremely Accurate I2C Real Time Clock with integrated crystal.
The mama shield is a kind of “motherboard” that lets you connect multiple shields to an Arduino.
Now it's possible to put three Arduino shields on one Arduino. There is also a matrix of solder jumpers so you can reassign the pins for each shield.
These are proto-cards for your Mama shield.
Using the very classic 74HC595, this shield gives you 64 pins of digital output while only using three digital pins on your Arduino.
Proto board for Mama Shield
The mama shield is a kind of “motherboard”that lets you connect multiple shields to an Arduino.