Discussion in "Project Doubts" started by    srisreya    Oct 2, 2010.
Sat Oct 09 2010, 06:08 AM
#11
30pF caps are actually loading capacitors provides stability and precise frequency output of a crystal oscillator.

the Loading capacitance (CL) is always given in oscillator datasheet so that one can calculate loading capacitors value. lets say if CL is given 20pF then loading caps can be anywhere from 27 to 33pF.

If the oscillation frequency is high, the capacitor values should be increased to lower the frequency. If the frequency is low, the capacitor values should be decreased, thus raising the oscillation frequency.

The relation between load capacitance of Crystal oscillator and loading capacitors is

CL=((C1 x C2) / (C1 + C2)) + Cstray

Cstray is the stray capacitance in the circuit, typically 2-5pF.
 srisreya like this.
Tags crystal loading capacitorload capacitance crystal oscillatorcalculate crystal oscillator load capacitance
Sat Oct 09 2010, 06:42 AM
#12
can u plz explain how a 1 sec delay is being generated and how d values of sec,min,and hours r incremented correspondingly...
Sat Oct 09 2010, 08:56 AM
#13
delay can be generated by lops and timers what u want to use timers or loops
Sat Oct 09 2010, 05:05 PM
#14
can u plz explain how it is done in ajay's design??
Sat Oct 09 2010, 09:17 PM
#15
dear srisreya
for a better understanding u should go thpugh to timers
on this site there is good tutorial or thread on timers u can read that
ajay make many clocks about which ur talking some uses rtc chips
 srisreya like this.
Sat Oct 23 2010, 01:06 PM
#16
sir,
can u plz explain me if der is any changes needed for pgm or circiut if i am changing 8051 by a 8052??
plz tell me wat changes i wil hav to make??
Sat Oct 23 2010, 01:20 PM
#17
hi srisreya
there will be no change u can use it
 srisreya like this.

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ExperimenterUK
Sat Oct 12 2019, 10:23 PM
Log in.. then post your code in the 8051 forum
Sat Oct 12 2019, 10:18 AM
Bhadra Sajikumar
i am doing a countdown timer with 8051 for my project, unfortunately our professor had to take a leave of absence before he could teach us most of it.. can someone explain the .asm code of it for me?
Mon Sep 23 2019, 07:37 AM
Nathaniel
I am doing a project for my schools wireless security system with cameras,sensors and spot lights using 8051 micro controller, could you help me out with the design and its source code.
Wed Sep 18 2019, 08:48 PM
Caryn Kover
Thank you for your time,
ExperimenterUK
Mon Aug 05 2019, 07:09 PM
@Ismail ..post in forum, give details
Mon Aug 05 2019, 04:33 PM
Ismail balghmi
Hello. Please I won't download
ExperimenterUK
Wed Jul 24 2019, 12:47 AM
@BUSTER123 Please post in the forum
Tue Jul 23 2019, 06:13 PM
BUSTER123
hello! newbie here. i am kind of a guy who hates using ready - made existing libraries, so this helped a lot as i was trying to control and write to a character lcd display. however, i can't figure out how to set the cursor position. for example, i want to set it to the 5th column in the first row, so position 5. so according to the table, i am sending 10000101 on the 8 data lines of the lcd (register select pulled low). the cursor does not move there however. and i cant move the cursor left or right too. is it something wrong that i am doing? thank you.
ExperimenterUK
Thu Jul 11 2019, 07:55 PM
@ramos https://www.theengineeringprojects.com/2017/09/l298-motor-driver-library-proteus.html
ExperimenterUK
Thu Jul 11 2019, 07:44 PM
@praveen123. Can you give a link to the project ?

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Sun Nov 10 2019, 04:43 AM
ty, really needed it
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Tue Oct 22 2019, 05:18 AM
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Mon Oct 21 2019, 09:18 AM
I’ve been following this thread and looking at the...
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sir, when i on display ,sometime 3rd display is no...
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Sun Oct 20 2019, 02:53 PM
sir, when i on display ,sometime 3rd display is no...
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Sun Oct 20 2019, 12:21 AM
Your code seems okay on my simulationTry my code o...
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Sat Oct 19 2019, 07:13 PM
please find video attachment. 3rd & 4th displa...
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Sat Oct 19 2019, 07:05 PM
sir, 3rd and 4th dot matrix display flickering, ...
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Posted By ExperimenterUK
Fri Oct 18 2019, 09:18 PM
Hopefully you understand some of the program.Which...