How to make a tachometer - Electronic Circuits Projects Diagrams Free

timoteo_mendes · 9th May 2008, 08:56 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, 01:05 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, 08:25 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, 01:46 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, 07:01 AM

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

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Title	Starter	Forum	Replies	Latest
Need help to make simple scoreboard with LEDs	rydad	Electronic Projects Design/Ideas/Reviews	10	14th April 2008 09:45 AM
How to make a 12 hour clock	IlordrossI	Electronic Projects Design/Ideas/Reviews	13	27th June 2007 01:11 AM
Car Adapter for Laptop-How to make?	Bill_activist	Electronic Projects Design/Ideas/Reviews	4	1st April 2005 08:37 AM
ps/2 keyboard to usb adapter, how to make	bd13	Electronic Projects Design/Ideas/Reviews	3	7th October 2004 09:53 AM
Merkle-Korff motor and tachometer	andrey8	Datasheet/Parts Requests	5	11th November 2003 03:39 AM

9th May 2008, 08:56 PM	(permalink)
timoteo_mendes	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, 01:05 AM	(permalink)
3v0	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, 3v0's Homepage The 15 Minute Printed Circuit Board! (+drill time)

14th May 2008, 08:25 PM	(permalink)
crust	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, 01:46 AM	(permalink)
Sceadwian	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. __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har."

15th May 2008, 07:01 AM	(permalink)
Gayan Soyza	http://www.geocities.com/ilufa/DST_E.htm __________________ Gayan My Website http://gsmicro.blogspot.com/