Use a small CD Motor for Rotary Input

As the author points out, light based encoders work but they are not cheap (think $20 each).  So an alternative is to take an cheap small DC motor an voltage divider and the analog input on an arduino to determine direction and speed.{feed}&utm_campaign=Feed%3A+%24{makezineonline}+%28%24{MAKE}%29&utm_content=%24{GoogleReader}

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