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				<pubDate>Thu, 08 Jan 2009 21:50:25 -0800</pubDate>
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						<item>
						<title>lcd</title>
<link>http://www.8051projects.net/forum-t8188.html</link>
<description><![CDATA[hey..me havin a similar prod as yun..my lcd displayed da required msg a couple of times...but thereafter its just da bars...i adjusted da contrast,tried programmin da chip again...but nothin...n i checked da voltages at da crystal input..they r fine..so da controller is ok...any suggestions...plz...this is urgent...i need to submit da proj in 3 days..<br /><br />thanks in advance<br />]]></description>
<pubDate>Mon, 07 Apr 2008 03:56:14 -0700</pubDate>
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						<item>
						<title>Re: lcd</title>
<link>http://www.8051projects.net/forum-t8188.html</link>
<description><![CDATA[well, im using d following assembly language code in my project(using AT89S52),<br />if dis is wat u require, then hav a look, its working fine in my project<br /><br /><br /><br /><br />;LCD PORT DEFINITIONS<br />DATAPORT EQU P0<br />EN EQU P1.2<br />RW EQU P1.1<br />RS EQU P1.0<br />D7 EQU P0.7<br /><br />ORG 0000h<br />LJMP MAIN<br /><br /><br />MAIN: 									<br /><br />		MOV DATAPORT,#0FFH       <br />		ACALL LCD216       						;LCD INITIALISATION<br />      	ACALL LCDCLR <br />    	ACALL RETHOME<br />	   	ACALL DONCOFF      						;LCD INITIALISED               <br />  		ACALL LCDCLR <br />        ACALL FCBFL <br />        ACALL COMMAND <br />        MOV DPTR,#TABLE15<br />        ACALL WRITE<br />        ACALL FCBSL <br />        ACALL COMMAND<br />        MOV DPTR,#TABLE25<br />        ACALL WRITE       <br />		RET       					<br /><br />TABLE15:  DB 'RESULT MODE',0 ;U MAY WRITE HERE WATEVER U WAN2 DISPLAY<br />TABLE25:  DB 'STARTING...',0<br /><br /><br /><br /><br /><br /><br /><br /><br />;LCD ROUTINES<br /><br />CHKBUSY: 							;Checks for the status of the LCD<br />        SETB D7<br />        CLR RS<br />        SETB RW<br /><br />LOOP:   <br />	    CLR EN<br />        SETB EN <br />        JB D7,LOOP  <br />		RET <br /><br />DISPLAY:<br />        ACALL CHKBUSY<br />        MOV DATAPORT,A<br />        SETB RS<br />        CLR RW<br />        SETB EN<br />        CLR EN        <br />		RET         <br /><br />COMMAND:<br />        ACALL CHKBUSY<br />        MOV DATAPORT,A<br />        CLR RS<br />        CLR RW<br />        SETB EN<br />        CLR EN<br />		RET         <br /><br />LCD216: <br />		MOV A,#38H			;FORCES 2 X 16 MATRIX<br />        ACALL COMMAND<br />		RET       <br /><br />LCDCLR:<br />		MOV A,#01H <br />        ACALL COMMAND<br />		RET<br /><br />RETHOME:<br />		MOV A,#02H					;RETURN HOME    <br />        ACALL COMMAND<br />		RET<br />  <br />DONCOFF:<br />		MOV A,#0CH <br />       	ACALL COMMAND<br />		RET   <br /><br />DONCB:<br />		MOV A,#0FH <br />        ACALL COMMAND<br />		RET   <br /><br />FCBFL:  <br />		MOV A,#80H <br />        ACALL COMMAND<br />		RET   <br /><br />FCBSL: <br />		MOV A,#0C0H <br />        ACALL COMMAND<br />		RET   <br /><br />WRITE:        <br />		CLR A<br />        MOVC A,@A+DPTR<br />        JZ BACK2<br />        ACALL DISPLAY<br />        INC DPTR<br />        JMP WRITE<br /><br />BACK2:  RET<br /><br /><br /><br />END<br /><br /><br />sorry for those irritating tabs n identations <img src='http://www.8051projects.net/e107_images/emotes/yahoo/1.gif' alt='' style='vertical-align:middle; border:0' />]]></description>
<author>contact@nospam.com (Ajay Bhargav)</author>
<pubDate>Mon, 07 Apr 2008 10:47:10 -0700</pubDate>
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						<item>
						<title>Re: lcd</title>
<link>http://www.8051projects.net/forum-t8188.html</link>
<description><![CDATA[waaauuu....., dis is good, no iritating tabs n identations, d windows "notepad" makers need to learn smthng frm here... <img src='http://www.8051projects.net/e107_images/emotes/yahoo/4.gif' alt='' style='vertical-align:middle; border:0' />]]></description>
<author>contact@nospam.com (Ajay Bhargav)</author>
<pubDate>Mon, 07 Apr 2008 10:54:02 -0700</pubDate>
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						<title>Re: lcd</title>
<link>http://www.8051projects.net/forum-t8188.html</link>
<description><![CDATA[hey...thanks...i don think anythin's wrong wid my code..but still...will try usin urs n check...thanks again..n yes...no tabs..:)...i was wonderin at tabs u talkin abt...]]></description>
<author>contact@nospam.com (Ajay Bhargav)</author>
<pubDate>Mon, 07 Apr 2008 10:56:59 -0700</pubDate>
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						<title>Re: lcd</title>
<link>http://www.8051projects.net/forum-t8188.html</link>
<description><![CDATA[well, either ur code has some problem or ur hardware. so try sending ur circuit  and/or ur code and maybe we can find the bug which is bugging u <img src='http://www.8051projects.net/e107_images/emotes/yahoo/4.gif' alt='' style='vertical-align:middle; border:0' />]]></description>
<author>contact@nospam.com (Ajay Bhargav)</author>
<pubDate>Mon, 07 Apr 2008 11:57:15 -0700</pubDate>
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						<item>
						<title>Re: lcd</title>
<link>http://www.8051projects.net/forum-t8188.html</link>
<description><![CDATA[well i saw ur code from the other forum topic. looks fine to me. can u send the circuit so that we can have an idea about how it is wired?.check the following:<br />1. power supply. preferably connect a 0.1uF decoupling cap across vcc and gnd and as close to microcontroller as possible.<br />2. connct two 33pF caps across the xtal and gnd.]]></description>
<author>contact@nospam.com (Ajay Bhargav)</author>
<pubDate>Mon, 07 Apr 2008 12:09:54 -0700</pubDate>
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						<title>Re: lcd</title>
<link>http://www.8051projects.net/forum-t8188.html</link>
<description><![CDATA[And have you hooked up a proper power-on reset ckt?<br />Try checking loose connections to the LCD.]]></description>
<author>contact@nospam.com (Ajay Bhargav)</author>
<pubDate>Mon, 07 Apr 2008 19:23:46 -0700</pubDate>
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						<title>Re: lcd</title>
<link>http://www.8051projects.net/forum-t8188.html</link>
<description><![CDATA[To add onto what pdi33 said, i suggest u use 0.1uF tantalum caps. They make a world of a change.<br />Check the supply o/p on the board depending on how well ur board is ul come to know how noisy ur gnd or vcc is. A friend of mine had a terrible time cleaning his ground  <img src='http://www.8051projects.net/e107_images/emotes/yahoo/3.gif' alt='' style='vertical-align:middle; border:0' />  <br />I was lucky dint face that problem.  <img src='http://www.8051projects.net/e107_images/emotes/yahoo/4.gif' alt='' style='vertical-align:middle; border:0' />  <br /><br />Dont worry ul get amazing advice over here, have faith... I have learnt alot from this forum. <br /><br />Good luck  <img src='http://www.8051projects.net/e107_images/emotes/yahoo/103.gif' alt='' style='vertical-align:middle; border:0' />]]></description>
<author>contact@nospam.com (Ajay Bhargav)</author>
<pubDate>Mon, 07 Apr 2008 19:47:14 -0700</pubDate>
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						<item>
						<title>Re: lcd</title>
<link>http://www.8051projects.net/forum-t8188.html</link>
<description><![CDATA[Oops.....when you can,avoid tantalums like plague.They are prone to leakage and when compared to ceramics are fairly 'slow'.They do have a speed advantage over hefty electrolytics but when choosing between 0.1uF ceramic or tant' always prefer ceramics.Ceramics also have a lower self inductance and are non-polar whereas tants' are essentially polarized(correct me if I'm wrong) and may lead to mishaps when reverse connected.They do have a size advantage over electrolytics though.<br />Amit..where did you get this info yaar?]]></description>
<author>contact@nospam.com (Ajay Bhargav)</author>
<pubDate>Mon, 07 Apr 2008 20:41:03 -0700</pubDate>
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						<item>
						<title>Re: lcd</title>
<link>http://www.8051projects.net/forum-t8188.html</link>
<description><![CDATA[thanks all...hey pdi33...my hardware's pretty simple...lcd on p1 n da 3 control signals from p3.0,3.1,3.2...i forgot abt da decoup capa completely...is it dat imp...will add it n try again today...n i m average at solderin,but shashijoseph i checked da continuity on each pin..should i do anythin else...n where can i get good moderately priced dev boards...atleast i won't hav to worry abt da solderin then...<br />thanks again... <img src='http://www.8051projects.net/e107_images/emotes/yahoo/1.gif' alt='' style='vertical-align:middle; border:0' />]]></description>
<author>contact@nospam.com (Ajay Bhargav)</author>
<pubDate>Tue, 08 Apr 2008 03:58:47 -0700</pubDate>
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						<item>
						<title>Re: lcd</title>
<link>http://www.8051projects.net/forum-t8188.html</link>
<description><![CDATA[hi anee,<br /><br /><div class='indent'>my lcd displayed da required msg a couple of times...but thereafter its just da bars..</div><br /><br />i understand from the above sentence  that for once your programme run perfectly...  then afterwards it didnt..!!<br /><br />the only problem then will be loose connection as Shashijoseph said..<br />try changing the cable between your uC and the LCD (dont rely on connectivity shown by a multimeter)<br />another possiblity cud be the crystall...<br />try changing the crystall (generally crystals do not bother u much but  that still cud be the case...)...  or at least check the contacts of the crystall if it is soldered properly..<br /><br />the third option if u are not using the busy flag mechanism  try increasing your delay loops..<br /> <img src='http://www.8051projects.net/e107_images/emotes/yahoo/1.gif' alt='' style='vertical-align:middle; border:0' />]]></description>
<author>contact@nospam.com (Ajay Bhargav)</author>
<pubDate>Tue, 08 Apr 2008 04:54:25 -0700</pubDate>
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						<item>
						<title>Re: lcd</title>
<link>http://www.8051projects.net/forum-t8188.html</link>
<description><![CDATA[Hello Anee,<br /><br />Check the following:<br /><br />1) any shorts between control pins(excess solder)<br /><br />2) did you accidently remove or pull the lcd connector when prog was running<br /><br />3) did you initialize the lcd to proper rows, once power is applied to lcd you have to <br /><br />wait atleast 15-20 mSec for internal initializing, and send 30H (i,e single row setting) 3 <br /><br />times with 4.5 msec intervals- this is standard initializing procedure that has to be <br /><br />followed.<br /><br />4) when using LCDs use Molex 16 pin connectors (male and female pin headers)<br /><br />5) did you try the prog on other LCD, borrow one from your lab or friend<br /><br />6) still if it doesn't work, it may be damaged so buy a new one <br /><br /><br />Good luck <br /><br />Arun]]></description>
<author>contact@nospam.com (Ajay Bhargav)</author>
<pubDate>Tue, 08 Apr 2008 08:00:26 -0700</pubDate>
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						<item>
						<title>Re: lcd</title>
<link>http://www.8051projects.net/forum-t8188.html</link>
<description><![CDATA[<div class='quote_top'>sashijoseph wrote ...</div><div class='quote'><br />Oops.....when you can,avoid tantalums like plague.They are prone to leakage and when compared to ceramics are fairly 'slow'.They do have a speed advantage over hefty electrolytics but when choosing between 0.1uF ceramic or tant' always prefer ceramics.Ceramics also have a lower self inductance and are non-polar whereas tants' are essentially polarized(correct me if I'm wrong) and may lead to mishaps when reverse connected.They do have a size advantage over electrolytics though.<br />Amit..where did you get this info yaar?<br /></div><br />Hey Shashi,<br />The guys on 8052.com had suggested my friend to use tantalums. They said they were better when it came to eliminating noise on the uC circuits! And practically my friend did see a difference when he used the tantalums instead of ceramics! I dont remember the thread, but il do a search and surely post that here!!! I am so sorry for giving out wrong info!!! <br />Please accept my humble apologies. <img src='http://www.8051projects.net/e107_images/emotes/yahoo/2.gif' alt='' style='vertical-align:middle; border:0' /> <br />And thanks for the info on the tantalums. <img src='http://www.8051projects.net/e107_images/emotes/yahoo/1.gif' alt='' style='vertical-align:middle; border:0' /> <br />]]></description>
<author>contact@nospam.com (Ajay Bhargav)</author>
<pubDate>Tue, 08 Apr 2008 08:14:40 -0700</pubDate>
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						<item>
						<title>Re: lcd</title>
<link>http://www.8051projects.net/forum-t8188.html</link>
<description><![CDATA[hi amit,<br /><br />you are not totally wrong....  so cheer up!!! <br /><br />there are some applications where tantulum has its advantages over ceramic and others...  your friend must have seen the difference by using them around the main power circuit areas..!!!!<br />but as shashi said  @ 0.1uF i practically never used a tant..  <img src='http://www.8051projects.net/e107_images/emotes/yahoo/10.gif' alt='' style='vertical-align:middle; border:0' /> <br /><br /><br />take a look here<div class='indent'><br /><br />There are numerous advantages to using tantalum capacitors over other types of capacitors. First, tantalum capacitors have a higher volumetric efficiency (CV/cc) when compared to other types of capacitors. For instance, a 10-microfarad tantalum capacitor can replace a 100-microfarad aluminum capacitor. Tantalum capacitors are easily mounted onto circuit boards, and give engineering designers the ability to place these components in closely-confined printed circuit board space, as well as utilizing tantalum capacitors' excellent power dissipation characteristics. Second, tantalum capacitors have superior frequency characteristics than many other types of capacitors, including aluminum electrolytics. A comparable CV tantalum capacitor has an ESR ten times better than an aluminum electrolytic capacitor. Third, tantalum capacitors are highly reliable - electrical performance qualities do not degrade over time. Tantalum capacitors do not lose capacitance unlike electrolytic capacitors - in fact, the shelf life for tantalums is regarded as unlimited. Fourth, tantalum capacitors don't wear out - in fact, if there is an imperfection in the dielectric layer of a tantalum, the resistance of the manganese dioxide layer will typically convert to a form that is even more resistive. The new oxide form plugs up the faulty region and results in a reduction in current flow. Finally, tantalum capacitors have an excellent wide operating range, from -55 degrees Centigrade to +125 degrees Centigrade, with a minimal amount of degradation in electrical properties throughout this range.</div><br /><br />practically i prefer them when operating at high frequency above or around 50Mhz..<br />plus sometimes around the power points  (vcc-gnd)  but never used as small as 0.1uF  cant say  why  <img src='http://www.8051projects.net/e107_images/emotes/yahoo/7.gif' alt='' style='vertical-align:middle; border:0' />   <img src='http://www.8051projects.net/e107_images/emotes/yahoo/7.gif' alt='' style='vertical-align:middle; border:0' />]]></description>
<author>contact@nospam.com (Ajay Bhargav)</author>
<pubDate>Tue, 08 Apr 2008 08:56:29 -0700</pubDate>
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						<title>Re: lcd</title>
<link>http://www.8051projects.net/forum-t8188.html</link>
<description><![CDATA[No problems Amit......you are partly right though.Tantalums will work better where you use electrolytics like 10uF,100uF etc.But for 100nF or so,it's ceramic always.]]></description>
<author>contact@nospam.com (Ajay Bhargav)</author>
<pubDate>Tue, 08 Apr 2008 09:13:51 -0700</pubDate>
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						<title>Re: lcd</title>
<link>http://www.8051projects.net/forum-t8188.html</link>
<description><![CDATA[hey anee, did u face dis problem: when u checked d lcd module independently, it worked fine, n wen u put it into ur main program or called it, then its not working??<br />if yes, then jst check if u hav put d "RET" statement at right place. actually, i did dis mistake n spent 2-3 hours to locate dis bug.]]></description>
<author>contact@nospam.com (Ajay Bhargav)</author>
<pubDate>Tue, 08 Apr 2008 09:56:44 -0700</pubDate>
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						<title>Re: lcd</title>
<link>http://www.8051projects.net/forum-t8188.html</link>
<description><![CDATA[hmmm.....hey...dat can be a possiblity...bcz once da prog worked da 1st time...i went beserk n made a whole lot of changes..i wanted to see whether da lcd displays a specific msg when a specific button is pressed...n thanks to pdi33 i got to know dat i haven't used da decouplin capa..gonna try tonight...lets see..thanks again.. <img src='http://www.8051projects.net/e107_images/emotes/yahoo/1.gif' alt='' style='vertical-align:middle; border:0' />]]></description>
<author>contact@nospam.com (Ajay Bhargav)</author>
<pubDate>Tue, 08 Apr 2008 10:25:30 -0700</pubDate>
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						<title>Re: lcd</title>
<link>http://www.8051projects.net/forum-t8188.html</link>
<description><![CDATA[in the program dat i used, d 'RET' statement used after second 'ACALL WRITE' is actually for returning frm dis module, so u may giv some name to d lcd module instead of dat 'MAIN' n call it in ur program.]]></description>
<author>contact@nospam.com (Ajay Bhargav)</author>
<pubDate>Tue, 08 Apr 2008 10:44:46 -0700</pubDate>
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						<title>Re: lcd</title>
<link>http://www.8051projects.net/forum-t8188.html</link>
<description><![CDATA[IT WORKED!!!!thanks a lot everyone... <img src='http://www.8051projects.net/e107_images/emotes/yahoo/69.gif' alt='' style='vertical-align:middle; border:0' />  ...wil be back wid my dac doubts... <img src='http://www.8051projects.net/e107_images/emotes/yahoo/1.gif' alt='' style='vertical-align:middle; border:0' />]]></description>
<author>contact@nospam.com (Ajay Bhargav)</author>
<pubDate>Tue, 08 Apr 2008 21:48:39 -0700</pubDate>
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						<item>
						<title>Re: lcd</title>
<link>http://www.8051projects.net/forum-t8188.html</link>
<description><![CDATA[<div class='quote_top'>shyam wrote ...</div><div class='quote'><br />hi amit,<br /><br />you are not totally wrong....  so cheer up!!! <br /><br />there are some applications where tantulum has its advantages over ceramic and others...  your friend must have seen the difference by using them around the main power circuit areas..!!!!<br />but as shashi said  @ 0.1uF i practically never used a tant..  <img src='http://www.8051projects.net/e107_images/emotes/yahoo/10.gif' alt='' style='vertical-align:middle; border:0' /> <br /><br />practically i prefer them when operating at high frequency above or around 50Mhz..<br />plus sometimes around the power points  (vcc-gnd)  but never used as small as 0.1uF  cant say  why  <img src='http://www.8051projects.net/e107_images/emotes/yahoo/7.gif' alt='' style='vertical-align:middle; border:0' />   <img src='http://www.8051projects.net/e107_images/emotes/yahoo/7.gif' alt='' style='vertical-align:middle; border:0' />  <br /></div><br /><br /><div class='quote_top'>sashijoseph wrote ...</div><div class='quote'><br />No problems Amit......you are partly right though.Tantalums will work better where you use electrolytics like 10uF,100uF etc.But for 100nF or so,it's ceramic always.<br /></div><br /><br />Hey thanks for all the info. <img src='http://www.8051projects.net/e107_images/emotes/yahoo/1.gif' alt='' style='vertical-align:middle; border:0' />  Got some serious gyaan on capacitors <img src='http://www.8051projects.net/e107_images/emotes/yahoo/4.gif' alt='' style='vertical-align:middle; border:0' />  Dint know they could make so much of a difference! Well my friend was using it b/w Vcc n Gnd at the uC only. And like u guys, the 8052 ppl also suggested him to place it as close to the uC. He used a 10uF though (if am not mistaken...)<br />But i have used a .1uF tant b/w Vcc n Gnd jst nxt to my uC. is it ok or do u think i must switch to ceramic? Regarding noise, i felt my Gnd was clean...]]></description>
<author>contact@nospam.com (Ajay Bhargav)</author>
<pubDate>Wed, 09 Apr 2008 06:53:29 -0700</pubDate>
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						<title>Re: lcd</title>
<link>http://www.8051projects.net/forum-t8188.html</link>
<description><![CDATA[If it ain't broke,don't fix it.. <img src='http://www.8051projects.net/e107_images/emotes/yahoo/1.gif' alt='' style='vertical-align:middle; border:0' />]]></description>
<author>contact@nospam.com (Ajay Bhargav)</author>
<pubDate>Wed, 09 Apr 2008 07:33:33 -0700</pubDate>
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						<title>Re: lcd</title>
<link>http://www.8051projects.net/forum-t8188.html</link>
<description><![CDATA[He he... il remenber that always <img src='http://www.8051projects.net/e107_images/emotes/yahoo/1.gif' alt='' style='vertical-align:middle; border:0' />]]></description>
<author>contact@nospam.com (Ajay Bhargav)</author>
<pubDate>Wed, 09 Apr 2008 07:51:13 -0700</pubDate>
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						<title>Re: lcd</title>
<link>http://www.8051projects.net/forum-t8188.html</link>
<description><![CDATA[well actually a good tradeoff between tantalum and ceramic capacitors is another family of capacitors called polypropylene capacitors which were previously costlier but nowadays are quite cheap (well .... cheaper than tantalum <img src='http://www.8051projects.net/e107_images/emotes/yahoo/3.gif' alt='' style='vertical-align:middle; border:0' />  ). these capacitors are usually the next best aternatives for ceramic caps and the regular ones available can have a value upto 1uF. these capacitors have excellent long term reliability/stability and are preferred in analog circuits using integration/differentiation,RC oscillaters,succesive approximation ADCs...etc]]></description>
<author>contact@nospam.com (Ajay Bhargav)</author>
<pubDate>Fri, 11 Apr 2008 06:43:21 -0700</pubDate>
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						<title>Re: lcd</title>
<link>http://www.8051projects.net/forum-t8188.html</link>
<description><![CDATA[Yeah and they're indispensable in audio ckts as well,esp in the signal path(where tants,electros and even ceramics suck big time).]]></description>
<author>contact@nospam.com (Ajay Bhargav)</author>
<pubDate>Fri, 11 Apr 2008 13:41:39 -0700</pubDate>
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						<title>Re: lcd</title>
<link>http://www.8051projects.net/forum-t8188.html</link>
<description><![CDATA[Hi Amit, don't get confused, for the 0.1 or 104 we regularly use by the VCC pin, use conformally coated radial capacitors (small yellow mainly). They are basically ceramic, also known as multilayer ceramic capacitors. They have very good temp stability, and are normally 10% tol, temp range -55 to +125deg C, dielectric X7R(?) and Z5U(?). As pdi said, bit costlier than ceramic disc, but much cheaper than tant. <img src='http://www.8051projects.net/e107_images/emotes/yahoo/1.gif' alt='' style='vertical-align:middle; border:0' />    <br /> <img src='http://www.8051projects.net/e107_images/emotes/yahoo/4.gif' alt='' style='vertical-align:middle; border:0' />  It feels good to give gayaan <img src='http://www.8051projects.net/e107_images/emotes/yahoo/4.gif' alt='' style='vertical-align:middle; border:0' />  <br /> <img src='http://www.8051projects.net/e107_images/emotes/yahoo/103.gif' alt='' style='vertical-align:middle; border:0' />]]></description>
<author>contact@nospam.com (Ajay Bhargav)</author>
<pubDate>Fri, 11 Apr 2008 13:47:06 -0700</pubDate>
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