Programming the Intel Edison: Getting Started with Processing and Python by Norris Donald

Author:Norris, Donald [Norris, Donald]
Language: eng
Format: azw3, epub, pdf
Publisher: McGraw-Hill Education
Published: 2015-10-12T16:00:00+00:00

After entering the above command, I immediately saw the motor rotating at a moderate r/min, as compared to my initial operational check when I simply connected the battery pack directly to the motor. The motor speed is somewhat proportional to the applied voltage. Notice, I stated it was somewhat, which implies a non-linear relationship. A linear relationship would mean if 3 V creates 3000 r/min than 6 V should rotate it at 6000 r/min. That’s not what happens in reality due to a variety of factors mostly related to how the motor is constructed.

I was interested in determining the speed versus applied-voltage relationship so I conducted the following experiment. I edited the tau value from 0.2 to 1.0 in steps of 0.2. I then reran the program at each tau step value and used an optical tachometer to measure the rotational speed of the miniature propeller attached to the motor shaft. The optical tachometer I used is shown in Figure 7-10 for those readers interested in duplicating this test.

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