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| Micro Controllers Discuss all aspects of micro controllers - building them, coding them, etc. All controllers are welcome - PIC, BASIC, Z8 Encore!, etc. |
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9th May 2008, 07:56 PM
| #1 (permalink) |
| New Member Join Date: Jun 2007
Posts: 2
 |  How to make a tachometer hello, I am tring to make my on tachometer using a pic 16f628 with internal oscillator and a lcd display. until now i could put the text for speed in the first line and in the second with rb3 i put a count of the pulses i have... I know there are lots of way to resolve the same problem, here i would like to know a sugestion how to resolve this. basicaly what i need is to count the number of pulses in rb3 divide that value by the sample time and multiply by 60 to have it in rpm. I can use CCP or timers with interrupt is true? the problem is that i don't know how to do it... any help or sugestion is well came. Thanks Tim |
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10th May 2008, 12:05 AM
| #2 (permalink) |
| Moderator Join Date: Jul 2006 Location: USA
Posts: 2,574
 | This question is asked very frequently. Checkout the may examples of tachs on the web. Start breading the circuits and play with the code. Then if you have question come back and ask.
__________________ To control the world from your PC with USB I suggest USB Bit Wacker 3v0's Tutorials for ABSOLUTE BEGINNER C, PIC 18F, MPLABŪ and MCC18 Compiler |
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14th May 2008, 07:25 PM
| #3 (permalink) |
| Experienced Member Join Date: Sep 2003
Posts: 719
| Also take a look at "frequency counters" as they are pretty much the same except in RPM, they are reading in cycles/second. Multiply by 60 to get cycles/minute.
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15th May 2008, 12:46 AM
| #4 (permalink) |
| Experienced Member  Join Date: Oct 2006 Location: Rochester, NY U.S.
Posts: 3,083
  | The internal oscillator isn't going to give you very accurate results. Frequency counters should run off a decent voltage regulator and a crystal oscilator.
__________________ Curiosity killed the cat; That's why they have nine lives. |
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