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LOW RPM HOW TO MEASURE ? (by QURESHI)
DEAR
PLEASE HELP ME ABOUT LOW RPM METER
I WANT TO LOW PULSE TIME MEASURING IN ROUND / MINUTE
EXPLANATION:
60 SECOND DIVIDED BY 1 PULSE = 60 RPM MEAN OUTPUT DISPLAY
60 SECOND DIVIDED BY 2 PULSE = 30 RPM OUTPUT DISPLAY
60 SECOND DIVIDED BY 60 PULSE = 1 RPM OUTPUT DISPLAY
HOW CAN I MEASURING ? I TRY TO MEASURE BUT NOT RESULT ACCURATE I NEED DISPLAY 00.0 RPM
FOR MEASURE WITHIN 3 TO 5 SECOND MAXIMUM TIME
HOW I CAN ?
THANK TO HELP ME IN PIC16F877A *.ld
(no subject) (by Jonathan Westhues)
What kind of sensor are you using to measure? A normal encoder would generate one (or more) pulse per revolution. So by counting the number of pulses in one minute, you would have the speed in RPM; but that's the reciprocal of what you write above.
(no subject) (by David R)
Hi,
I think I understand,
Ldmicro can not calculate decimal point.
You will need to encode 10 or more pulse per revelation and
count them and display it as 300 (is equal to 30.0 rpm)
you could split out the last zero and produce it as A separate number and print it after A point.
Remember the input pulse needs to be slower than the scan time of the chip.
Hope this helps
Regards
David.
(no subject) (by QURESHI)
DEAR Jonathan Westhues and David R
THANK TO REPLY ME and try to solve my problem
RPM MEAN ROUND PER MINUTES
METAL DETECTOR SENSOR TO PROVIDE ONE PULSE , NO ENCODER USED
1st PULSE TO 2nd PULSE BETWEEN TIME MEASURING WIDTH CALCULATION MEAN
FOR EXAMPLE:
1st PULSE TO 2nd PULSE WIDTH MEASURING SUPPOSED
1ST TO SEE ATTACHMENT
NEED WHEN TIME INCREASE THEN RPM SHOW DISPLAY LOW 1 RPM
NEED WHEN TIME DECREASE THEN RPM SHOW DISPLAY HI 60 RPM
PLEASE SOLVE THIS PROBLEM THANK TO YOU SEND ME IN (FILE LDMICRO)
(no subject) (by MGP)
1 pulse per revolution is not enough
You can not measure 1 rpm in 5 seconds, you'll need at least 60 sec.
A timer and a counter will do the job
If you want to display the measurement every 5sec. The minimum speed in this case = 20 rpm.
If you want a faster reading than every 60sec, you need at least [display time = 60 / pulses per revolution].
Example low RPM counter (by MGP)
Attached an RPM counter.
How to dislay it, is your problem ;-)
(no subject) (by MGP)
Your welcome.
You can always contact me on this forum.
I live in Belgium (Brussels), so Pakistan is to far for me ;-) , Nevertheless, thanks for the offer.
Regards
RPM Counter (by SocialMyth)
Hi MGP! I can't open the RPM_counter.ld file you attached, do you happen to have another copy?
RPM_counter.ld is ok file (by MFQ)
my computer easily download and open in it
whats problem in your downloading ?
When enough rpm led on. (by Razi)
Hi Mr how to on led .. example I want on led at 6000 rpm can help me?
(no subject) (by MGP)
I have slightly modified the program for reading higher engine speeds.
(no subject) (by Razi)
I will try to thank you sir
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