alarm house 16f877 ? - Page 4 - Electronic Circuits Projects Diagrams Free

blueroomelectronics · 16th July 2009, 07:31 PM

Since the LED is flashing why would you assume the 16F877 is broken?

be80be · 16th July 2009, 07:36 PM

Quote:

why it does not function with the lcd 2x16 ?

I told you when you first posted your osc is not working right . Your using a 20mzh crystal on the bread board that don't always work as planned. You posted a picture where it made a bunch of squares but no words I have had that happen it was the OSC not coming to speed change your code to use the 4mhz crystal and the lcd will work
on your 16f877

seti75 · 16th July 2009, 07:40 PM

the 16f877 does not function with my lcd 2x16

to see the post at the beginning.

with the moin 10 programs tested, no n' functioned with the 16f877,

the lcd is good since it was tested with the 16f84 and it functions perfectly

be80be -->
but j' board makes test with the lcd and the 16f877 with quartz of 4mhz and without quartz I n' board ever have any favorable result

be80be · 16th July 2009, 07:45 PM

Quote:

Originally Posted by seti75

the 16f877 does not function with my lcd 2x16

to see the post at the beginning.

with the moin 10 programs tested, no n' functioned with the 16f877,

the lcd is good since it was tested with the 16f84 and it functions perfectly

Your using a 4 mhz crystal with the 16f84 Your using a 20 mhz crystal with the 16f877
When you tested the blink code what crystal did you use

seti75 · 16th July 2009, 07:54 PM

4mhz flash led 16f877 ..... ..ok
4mhz lcd 16f84.................... ..ok
4mhz and 16f877 and lcd ....... not good
20mhz and 16f877 and lcd ......not good

be80be · 16th July 2009, 08:02 PM

This is how I do it. In this pic look at how the crystal resonator is placed

They don't work good with jumper

Chippie · 16th July 2009, 08:13 PM

The original schematic used a 20Mhz xtal...

be80be · 16th July 2009, 08:31 PM

chippie I no what it used did you look at the picture that OP posted the 20mhz crystal is hooked to the 16f877 with jumpers. The chips not osculating is what's wrong
This is OP board look at osc

Chippie · 16th July 2009, 08:44 PM

Quote:

Originally Posted by be80be

chippie I no what it used did you look at the picture that OP posted the 20mhz crystal is hooked to the 16f877 with jumpers. The chips not osculating is what's wrong

Ah..sorry didnt realise you knew about the xtal....but yeah agree his setup isnt v.good

Scoping the pins should tell whats going on...

seti75 · 17th July 2009, 12:16 AM

Before opening the post (1) first one, I had made this alarm
At the beginning the problém was the same ! Nothing on the lcd.
It is for that that I post Voila the position of the quartz, and it was the Same thing

my alarm Imageshack - quartz

be80be · 17th July 2009, 01:13 AM

Quote:

It is for that that I post Voila the position of the quartz, and it was the Same thing

It's still the Osc not working I have had it happen. It's up to you to fix it.
I have changed crystals and it worked fine. If I could fly over I bet I'd have it running
in a sec.

be80be · 17th July 2009, 02:40 AM

The blinking a led with the Watchdog Timer on a 16f877 will not tell you if the crystal
is working

Quote:

The Watchdog Timer is a free running on-chip RC oscillator
which does not require any external components.
This RC oscillator is separate from the RC oscillator of
the OSC1/CLKIN pin. That means that the WDT will
run, even if the clock on the OSC1/CLKIN and OSC2/
CLKOUT pins of the device has been stopped, for
example, by execution of a SLEEP instruction

seti75 · 18th July 2009, 12:54 AM

be80be , thank
I thank all for your help .
I leave this project because it will never work! One friends think that the program b' is not good.
This program was on a French forum, but the one that he proposed it was not on his (her,its) program,
the electronique pratique (review) practical do not propose any more the program.

If you know an alarm with a lcd and the same possibility that that her(it) thank you for me proposed.
I leave , the program which made me lose a lot of time(weather), if a person want to make tries...

program ---> Free - Envoyez vos documents

Imageshack - sanstitre1txf

Imageshack - sanstitre3p

Imageshack - sanstitre4i
Imageshack - sanstitre5c

blueroomelectronics · 18th July 2009, 03:21 AM

Was this a school project?

be80be · 18th July 2009, 04:03 AM

Well seti75 it's up[ to you but I don't think your problem is as hard to fix as you think.
You can't test the oscillator with the code from blueroomelectronics He was using the wdt it would still blink if you pulled the crystal out and threw it away.I still say it's in that 20 mhz crystal your using

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16th July 2009, 07:31 PM	#46
blueroomelectronics	Since the LED is flashing why would you assume the 16F877 is broken? __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com/

16th July 2009, 07:40 PM	#48
seti75	the 16f877 does not function with my lcd 2x16 to see the post at the beginning. with the moin 10 programs tested, no n' functioned with the 16f877, the lcd is good since it was tested with the 16f84 and it functions perfectly be80be --> but j' board makes test with the lcd and the 16f877 with quartz of 4mhz and without quartz I n' board ever have any favorable result __________________ paris (france) Last edited by seti75; 16th July 2009 at 07:45 PM.

16th July 2009, 07:54 PM	#50
seti75	4mhz flash led 16f877 ..... ..ok 4mhz lcd 16f84.................... ..ok 4mhz and 16f877 and lcd ....... not good 20mhz and 16f877 and lcd ......not good __________________ paris (france)

16th July 2009, 08:02 PM	#51
be80be	This is how I do it. In this pic look at how the crystal resonator is placed They don't work good with jumper __________________ Burt http://mybe80be.com http://stores.shop.ebay.com/mybe80be__W0QQ_armrsZ1 Last edited by be80be; 16th July 2009 at 08:34 PM.

16th July 2009, 08:13 PM	#52
Chippie	The original schematic used a 20Mhz xtal... __________________ Eccentric millionaire financed by 'er indoors

16th July 2009, 08:31 PM	#53
be80be	chippie I no what it used did you look at the picture that OP posted the 20mhz crystal is hooked to the 16f877 with jumpers. The chips not osculating is what's wrong This is OP board look at osc __________________ Burt http://mybe80be.com http://stores.shop.ebay.com/mybe80be__W0QQ_armrsZ1 Last edited by be80be; 16th July 2009 at 08:46 PM.

17th July 2009, 12:16 AM	#55
seti75	Before opening the post (1) first one, I had made this alarm At the beginning the problém was the same ! Nothing on the lcd. It is for that that I post Voila the position of the quartz, and it was the Same thing my alarm Imageshack - quartz __________________ paris (france) Last edited by seti75; 17th July 2009 at 12:17 AM.

18th July 2009, 12:54 AM	#58
seti75	be80be , thank I thank all for your help . I leave this project because it will never work! One friends think that the program b' is not good. This program was on a French forum, but the one that he proposed it was not on his (her,its) program, the electronique pratique (review) practical do not propose any more the program. If you know an alarm with a lcd and the same possibility that that her(it) thank you for me proposed. I leave , the program which made me lose a lot of time(weather), if a person want to make tries... program ---> Free - Envoyez vos documents Imageshack - sanstitre1txf Imageshack - sanstitre3p Imageshack - sanstitre4i Imageshack - sanstitre5c __________________ paris (france)

18th July 2009, 03:21 AM	#59
blueroomelectronics	Was this a school project? __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com/

18th July 2009, 04:03 AM	#60
be80be	Well seti75 it's up[ to you but I don't think your problem is as hard to fix as you think. You can't test the oscillator with the code from blueroomelectronics He was using the wdt it would still blink if you pulled the crystal out and threw it away.I still say it's in that 20 mhz crystal your using __________________ Burt http://mybe80be.com http://stores.shop.ebay.com/mybe80be__W0QQ_armrsZ1