How to make a tachometer - Electronic Circuits Projects Diagrams Free

timoteo_mendes · 9th May 2008, 07:56 PM

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

**3v0** · 10th May 2008, 12:05 AM

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.

crust · 14th May 2008, 07:25 PM

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.

Sceadwian · 15th May 2008, 12:46 AM

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.

Gayan Soyza · 15th May 2008, 06:00 AM

http://www.geocities.com/ilufa/DST_E.htm

9th May 2008, 07:56 PM	(permalink)
timoteo_mendes New Member	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

10th May 2008, 12:05 AM	(permalink)
3v0 Moderator Blog Entries: 3	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. __________________ search engine for electronic parts Junebug USB PIC programmer kit., USB Bit Wacker, Homepage The 15 Minute Printed Circuit Board! (+drill time)

14th May 2008, 07:25 PM	(permalink)
crust Experienced Member	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. __________________ www.ps3toothfairy.com -- Full IR control for your PS3

15th May 2008, 12:46 AM	(permalink)
Sceadwian Experienced Member Blog Entries: 1	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.

15th May 2008, 06:00 AM	(permalink)
Gayan Soyza Experienced Member Blog Entries: 1	http://www.geocities.com/ilufa/DST_E.htm __________________ Gayan Forum Supporter

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