Lego Double Rotation Sensor

  
An opto-interrupter made with Lego beams, regular parts, a 6 hole pulley wheel and an axle.
Lego Double Rotation Sensor - schematic

I started out with Michael Gasperi's idea with the 6 whole pulley installed in a Lego enclosure with axle and beams so it could move. I used phototransistors and infrared LED's because I thought they would use less power than visible light LED's and CdS p



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