Description
I explored eccentric weight placements by inserting the motor off-center in a circular piece of cork, attaching lengthy objects (such as a pen) off-center to the shaft, and others. I noticed that, despite the low-torque of the motor, it provides fairly substantial resistance while holding it as it spins at full speed. Add a big enough eccentric weight (that the motor could still spin) and you might have a low-powered grip trainer!
However, that's not what I decided to do, given the limitations of the motor. Instead, it seemed like an interesting opportunity to use this to our advantage. In this case, a magic 8 ball! The user holds the motor, asks it a question, and turns the potentiometer to spin the eccentric weight. Its motion blurs the answers, making it difficult to predict what answer it will provide.
Components Used
1- Arduino Uno
1- DC motor
1- TIP120 transistor
1- 1N4004 diode
1- 1k ohm resistor
1- potentiometer
Code
Unchanged from lab: download.
Photos
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