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Controlling solenoids with relays and Arduino using push buttons

Learn how to run a CDROM brushless motor with Arduino

Stacking Shields. You can stack up to 32 shields for a total of 64 steppers or 128 DC motors, or ....[insert your function here]! The only thing to watch for when stacking shields is every shield must have a unique I2C address. The default address is 0x60. You can adjust the address of the shields to range from 0x60 to 0x80 for a total of 32 unique addresses. (this is the explanation for Adafruit boards, it would be similar for arduino)

from Folger Technologies LLC

Arduino Compatible Nano V3.0 ATmega328 5V Micro-controller Board + Mini USB

Arduino Compatible Nano Micro-controller Board + Mini USB in Consumer Electronics, Gadgets & Other Electronics, Other Gadgets | eBay