Comments on: AVR Project – Relay Timer with ATmega8 AVR MCU

By: Avinash

Avinash — Tue, 12 Feb 2013 04:31:07 +0000

@Jatin,

You are wrong and confused, you can do it either way. But I don’t have time telling you what wrong you are doing coz it’s just lack of your common sense.

By: Jatin

Jatin — Mon, 11 Feb 2013 17:49:59 +0000

Problem solved Guys !!!
Was able to recover those IC’s by providing an external crystal support .
The Project now works PERFECT !!!
Just as word of precaution
ALWAYS ..flash the AVR first and then set the Fuse to HIGH:C9 and LOW:FF ….Dont do it the other way round .
This was the mistake I did …Now i learnt !!
Thanks for a great project .
Jatin

By: nishad

nishad — Wed, 16 Jan 2013 13:24:00 +0000

plz give pcb layout of this pro

By: Rajeev

Rajeev — Mon, 26 Nov 2012 11:51:34 +0000

Can you plese publish a clock with a light control to On/Off Porch light at every evening (eg. On at 6.30 pm and Off at 10.30 Pm unattended by settin On off time)

By: Avinash

Avinash — Mon, 24 Sep 2012 07:51:41 +0000

@Handrianto,

because you forget to read this instruction

“Use avr-gcc + AVR Studio to compile.”\

Its there in the program itself.

Please I don’t like careless peoples making mistakes and eating my time !

By: handrianto

handrianto — Mon, 24 Sep 2012 07:35:18 +0000

i very apriciate to your project
i will try it for my student

By: handrianto

handrianto — Mon, 24 Sep 2012 07:31:59 +0000

thank for you aplication

mr i have problem with this project because when i compile this program in code vision evaluation there is error in this part

in this part VOID WAIT ( UINT8_T N )
is declration syntax error

tanks for u kindness

By: handrianto

handrianto — Mon, 24 Sep 2012 07:29:15 +0000

thank for you aplication

mr i have problem with this project because when i compile this program in code vision evaluation there is error in this part
void Wait(uint8_t n)
{

uint8_t i,temp;
temp=n*28;

for(i=0;i _delay_loop_2(0);
}

in this part VOID WAIT ( UINT8_T N )
is declration syntax error

tanks for u kindness

By: Riey

Riey — Sat, 01 Sep 2012 09:04:13 +0000

This relay timer only could work with 16Mhz External Crystal, cannot lower or higher, or will not exactly match with the clock.
Attention for the fusebit, Can set with AVRIOSP Software.
I suggest you better make it with CMOS IC Such as 74HC595 or 74LS164.
Keep Posting for the next an amazing project…

By: kostas

kostas — Fri, 24 Feb 2012 18:00:31 +0000

Dear avinash,
Thank you very much for sharing such working projects!!! i really love your tutorials … always helping me to learn manipulating avrs!! I would like to ask you what the function of the myutils.h file and if the lcd.c and lcd.h files are written by you or are libraries for driving lcd’s?
thank you very much in regards!

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Wed, 25 Jan 2012 20:45:51 +0000

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By: Emil

Emil — Fri, 28 Oct 2011 22:05:52 +0000

Hi!
I have the same problem like “pepe gonzaes”: i want to use this countdown timer for a UV exposure unit PCB and I need Minute:Seconds.
If you can put a HEX for this it will be great (and appreciated!)
tnx!

By: Raj

Raj — Fri, 14 Oct 2011 06:09:39 +0000

Dear all,
I want to make an event detection timer using 16 MHZ external crytal and atmega32 microcontroller which will be able to calculate the event difference between two port in nano second range. Please help me.

By: Pepe Gonzaez

Pepe Gonzaez — Sun, 02 Oct 2011 20:20:48 +0000

Dear Sir:

I just build this project, but your C code counts HH:MM, what I have to do to change it to count MM:SS

Thanks

By: masoud

masoud — Thu, 15 Sep 2011 05:19:39 +0000

hi i am iranian
thanks for it circuit

By: paul

paul — Wed, 14 Sep 2011 06:49:52 +0000

Bonjour

Problème résolu par la mise en place de poussoirs liniature a la place de modeles plus gros !
cordialement

By: paul

paul — Thu, 01 Sep 2011 11:18:19 +0000

Bonjour

je vien de réaliser ce montage,j’ai juste un petit problême a la fin du décompte l’affichage reviens a welcome.ont a juste le temps de voir la ligne pour relancer le programme.

cordialement

Paul

By: shohaib

shohaib — Fri, 15 Oct 2010 14:18:38 +0000

thanks for this project…..
I remained searching for hardware requirements for a ATMEGA8l for proper operation for the whole last week,
basically i was trying to shift to AVR’s from 89c51′s,
so was trying to find, what are the necessities….
but was unable to find one,,,,
but your project clearly shows , what hardware is necessary,
once again thanks

By: neil ablang

neil ablang — Mon, 19 Jul 2010 08:15:32 +0000

@avinash

thanks for the clarification. uint8_t can be used too for those global variables? I am trying use part of your codes into my programs, being newbie on AVRs but not on C.

anyway, I found your tutorials so easy to follow . It helps a lot, along with reading the Datasheets.

By: Avinash

Avinash — Mon, 19 Jul 2010 02:40:15 +0000

@Neil

Because we are running on 8bit CPU and it can handle 8bit variable much more efficiently. It we know value that a variable will hold is in range of -127 tp +128 then we use char only. Another typedef for it is int8_t which stands for 8 bit integers.