12 Threads found on edaboard.com: 89c51 Frequency Counter
sir can we make device for measuring 2ghz using 89c51
Microcontrollers :: 11.02.2011 06:45 :: harishwww :: Replies: 2 :: Views: 1376
I think that, the best way to measure freq using AT89c51 is to use prescaler before feeding you pulse to MCU pins.
For ex. if frequency range is 1kHz to 40Mhz, you can devide it for 1000, so your range is only 1Hz to 40Khz. It's easy to measure this range using 89c51 (Of course, your prescaler block is not simple).
The last thing to do (...)
Microcontrollers :: 20.07.2005 15:15 :: semiconductor :: Replies: 10 :: Views: 4957
hello,i m working on a project of measuring online freq using 89c51.Can u help in making the project repotr.plzz
Embedded Systems and Real-Time OS :: 11.04.2006 02:17 :: deepti.deeps :: Replies: 1 :: Views: 1208
frequency:- No. of pulses/1sec
With help of uC 89c51 you can measure only 0-5V pulses.
Therefor is your triangular wave have amplitude with in this range? if not then
convert triangular wave to square wave. then connect this to int1/INT0,
Configure timer2 for one second using 16 bit auto reload.
Before stating measurement init
Microcontrollers :: 09.10.2006 05:34 :: BABESH :: Replies: 3 :: Views: 702
i m trying to get input pulse in 89c51 through external interrupt.that pulse is unknown !!
then i could i calculate the frequency of that pulse!!
Professional Hardware and Electronics Design :: 18.11.2012 01:54 :: sujeethaa :: Replies: 18 :: Views: 774
Some body knows how to make a 89c51 MCU
to divide the frequency
Microcontrollers :: 06.03.2005 12:04 :: TheSniper :: Replies: 5 :: Views: 933
can be quiet simple but still i want to ask what's the maximum frequency i can measure with 89c51 running on 24MHz crystal. i want to design a frequency meter using these basic two components...
Microcontrollers :: 06.10.2005 22:43 :: sush :: Replies: 1 :: Views: 511
i want to know how to measure frequency using 89c51.
my frequecy range is almost 6 khz to 7khz.
i need some help regarding code.
thanks very much
Microcontrollers :: 23.05.2008 02:22 :: ehsanelahimirza :: Replies: 12 :: Views: 4316
i am counting pulses for 89c51 and need to display the results on lcd.
doing this with keil and with "c".
i need to run a timer for 10 seconds and count the number of pulses for tht duraton.. coming from external interrupt EX1. ( PIN P3.2)
The problem is:
i cant understnd how to do tht with the timer.. to wit for 10
Microcontrollers :: 24.05.2009 16:25 :: ronydc :: Replies: 2 :: Views: 2175
hey can some one give me some hints how to detect rf signals to display frequency on lcd.
Microcontrollers :: 23.02.2010 11:33 :: santoshaxl :: Replies: 8 :: Views: 991
There are hundreds of post on similar subject ..
Just use SEARCH with "8051 AND rs232" or "89c51 AND rs232" ..
Here is an example:
ASIC Design Methodologies and Tools (Digital) :: 03.09.2007 08:37 :: IanP :: Replies: 4 :: Views: 1546
Hi, I am learning the 89c51 programming in keil C. Presently i want to read the clock (or pulse train of any frequency form 1 to 1100 Hz using proteus software). But there is some percentage error in the values that are displayed on LCD. e.g if feed 1kHz clock signal thr LCD shows 1001 or 1002, which is not a problem. The problems comes when i mult
Microcontrollers :: 06.03.2010 13:24 :: blacksnow :: Replies: 2 :: Views: 1849