does anybody know how I can monitor the speed without buying a timing light or digital tachometer? would like to run at 1440 rpms real time, im using B2, mmb and rotory encoder. thanks!
1440 rpms and an encoder will probably give you too many pulses per second to process reliably with the BS2. You could use an external divider circuit to reduce the pulse frequency, if the encoder is already in the circuit.
Detect your shaft speed once per revolution. Use a Hall effect sensor and a small metal flag on the shaft or use a photocell and detect a reflective spot. Use the PULSIN to measure from pulse to pulse and calibrate in speed. Or use the COUNT function.
He’s using the Motor Mind B which has a Tach input, but since he started a new thread for the same subject there’s nothing to explain that. All future posts should be referred to the original thread at the following link. This is a duplicate thread.
Comments
Detect your shaft speed once per revolution. Use a Hall effect sensor and a small metal flag on the shaft or use a photocell and detect a reflective spot. Use the PULSIN to measure from pulse to pulse and calibrate in speed. Or use the COUNT function.
Cheers
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Tom Sisk
http://www.siskconsult.com
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He’s using the Motor Mind B which has a Tach input, but since he started a new thread for the same subject there’s nothing to explain that. All future posts should be referred to the original thread at the following link. This is a duplicate thread.
http://forums.parallax.com/showthread.php?p=638414
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Chris Savage
Parallax Tech Support
thought it was a typo!
Tom
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Tom Sisk
http://www.siskconsult.com
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