27-04-2012, 02:12 AM
I am doing my final year technical project on "sharpening pencil robot design". i don't have any idea about how the sensor work. my situation is.. the blade will run by the motor to sharp the pencil until the pencil sharpen and automatically the motor will stop. So i need your help to tell me..what kind of sensor i must use to detect the pencil comes in and motor run, the when the pencil already sharp the motor will stop and saves time and pencils by avoiding over sharpening.