Comments on Design with Microcontrollers: microSD ATmega32 Data-Logger

Hi you, I have an electronic scales the second lin...

2012-02-11T08:13:43.934-08:00

Hi you, I have an electronic scales the second line RXD and GND pins, please help me save the signal circuit on sd card, always ask for their code and how to load code, thank you very much

Hi you, I have an electronic scales the second lin...

2012-02-11T08:13:01.567-08:00

Hi you, I have an electronic scales the second line RXD and GND pins, please help me save the signal circuit on sd card, always ask for their code and how to load code, thank you very much

Just drop by to say thanks a lot for the share! I ...

2012-02-06T22:56:42.023-08:00

Just drop by to say thanks a lot for the share!
I had a datalogger project which log current, voltage, and temperature data for recording photovoltaic activities. At first I kinda confused but thanks again it's now Done!

Regards,
ivantriyadi@gmail.com

After reading this, I've decided NOT to buy mi...

2012-02-01T02:30:32.811-08:00

After reading this, I've decided NOT to buy microSD cards from China. Ever. I'll stick to official trusted retailers only. I'm sure SD cards and FAT32 will really work flawlessly for me too.

Hi sir, Gr8 job.I am using silabs mcu i.e c8051f93...

2012-01-31T23:21:20.986-08:00

Hi sir,
Gr8 job.I am using silabs mcu i.e c8051f930 using this with SPI i need to write and read the data from micro sd please suggest whether your code is working with this fine or not?.Please let me know.
Thanks.

If you suggest me the changes in coding and schema...

2012-01-15T01:11:39.803-08:00

If you suggest me the changes in coding and schematic please send on my mail id: vkcontrol@rediffmail.com

Respected Sir, Its great project, I ...

2012-01-14T13:29:41.348-08:00

Respected Sir,
Its great project, I am final year student, i choose your project for my final year project but i want to add another four different sensors for remaining port pins in portA so which kind of changes required in schematic as well as in your posted coding, i was tried to add by taking yours posted coding reference but bugs are in my coding still remains. I really want your valuable Guidance Sir.
Thank you

Yours Student
Vicky V.K.

Not in the ADX but the ADC ;)

2012-01-14T12:24:32.682-08:00

Not in the ADX but the ADC ;)

Hi, how can I faster sampled data. I need about 10...

2012-01-14T12:21:57.317-08:00

Hi, how can I faster sampled data. I need about 100-200 Hz. I'm not using RTC, I tried different settings in ADX, but it does not change anything. I removed the loop with the INTERVAL. Please help me.

sir we need a code to display content of text file...

2012-01-12T23:11:34.862-08:00

sir we need a code to display content of text file stored in mmc on 16x2 lcd

Hi I was going though your code which supports SD...

2012-01-11T21:06:09.445-08:00

Hi
I was going though your code which supports SDHC card. The routine which converts normal short file name into FAT format. I could not get this part of the code which is used for setting file extension. Can you please explain the concept used in this. For setting file extension we use first three letters of file extension. Are there any other rules also for that? What if file have only 2 character extension?
Please reply soon

for(k=8; k<11; k++) //setting file extention
{
if(fileName[j] != 0)
fileNameFAT[k] = fileName[j++];
else //filling extension trail with blanks
while(k<11)
fileNameFAT[k++] = ' ';
}

especially, when write data with elm chan lib. lik...

2011-12-10T10:03:08.678-08:00

especially, when write data with elm chan lib.
like in the example:
char text[]="i like codevision avr";

to logging the data like:
char text[]=" %d , %d \r\n", temp, volt; <<-- but it doesnt work..

thats awesome sir... but i totally dont understan...

2011-12-10T09:22:55.216-08:00

thats awesome sir...
but i totally dont understand :), because maybe i havent learn avrgcc yet, i usual use codevision for the compiler, and the sintax little bit different between them...
would you write it in codevision?
thanks a lot.. :)

Hello Sir, nice job here. Please I want to find ou...

2011-11-28T19:32:18.128-08:00

Hello Sir,
nice job here. Please I want to find out if I can use this data logger to measure and store the voltage and current from a 12V car battery. Thanks.

can u please tell me how to attach file in any blo...

2011-11-17T23:28:02.593-08:00

can u please tell me how to attach file in any blog for new post. i have just now create my eblog nw i have copy my word document in one of the post but images r not copied to it....and i don't want to insert single image. i ust want to attached some file which i have made...so plz help me..i also want to create blogs.
my email id is rinki.arora88@gmail.com

I'm very sorry about last comments, I'm ne...

2011-10-27T05:08:59.013-07:00

I'm very sorry about last comments, I'm newby in programming and electronics... i was looking for mistakes in code and analyzed doubtfull parts:) it is everything OK with code, my Xmega permanently restarted due to my fault, not because of the code... my hardware was bad -I forgot to put schottky to my switch mode power supply, so when uc was starting writing to SD card, voltage dropped down and BOD protection restarted uC...

Hi again, In my opinion(it may be wrong), there ...

2011-10-26T13:39:10.408-07:00

Hi again,

In my opinion(it may be wrong), there is something wrong with function - writeFile. When function appending an existing file i overflows 512 -max value:

i = fileSize % bytesPerSector;
while((data != '\n') && (k < MAX_STRING_SIZE)) {
data = dataString[k++];
buffer[i++] = data;
}

bytesPerSector=512, so if fileSize is not mulptiple by 512, i overflows...

Maby something is wrong in my thoughts, please comment.
Thank you.

yes, there are bugs with corrupted files...my uC r...

2011-10-22T23:17:28.858-07:00

yes, there are bugs with corrupted files...my uC restarts, because of SD card writing failure and trying to write to the same file, the file is corrupted and uC restarts over and over again...could you tell me where is mistake in code?thank you

Good Job, great work. However, I found there's...

2011-10-16T22:44:14.807-07:00

Good Job, great work.
However, I found there's a bug. Whenever the appended filesize equals to the multiples of the cluster size (512bytes), forexample, when I write 128 times of 20 bytes data, = 2560bytes. Starting from 2560bytes, the file will be corrupted and can't be recognised by Windows.

I have tried to run this code in avrstudio 4 with ...

2011-10-15T09:10:03.419-07:00

I have tried to run this code in avrstudio 4 with AVRGCC compiler but at the time of 'build' operation it gives 43 numbers of error. (e.g- undefined reference to 'spi_init', undefined reference to twi_init' etc.i believe the winAVR you were refering to is the AVRgcc

hi sir been trying to build and compile the source...

2011-10-15T08:44:33.736-07:00

hi sir been trying to build and compile the source code given in thi post version 1.0 but it has so many undeclared functions.
your assistance on this will highly be appreciated as it will help me in debugging of codes

Hi again, I've solved problem, now it's w...

2011-10-14T02:27:55.550-07:00

Hi again,
I've solved problem, now it's working :) My avr studio 5 Gcc compiler doesn't change types of variables, no typecasting.

2011-10-08T22:42:28.816-07:00

This comment has been removed by the author.

Hi, I,ve downloaded your code, put it to my new a...

2011-10-08T22:41:57.387-07:00

Hi,
I,ve downloaded your code, put it to my new atxmega256a3b and nothing worked...Initialization passed(returned 0, card type-standart capacity), but when I'm trying to get boot sector data, function returns 1...I was debugging code for whole day, piece by piece and find out, that uC doesn't get start block token (0xfe). I've formatted my SD card (2GB) as FAT32, with 512 b. MAby something wrong with initialization, that card doesn;t understand next commands or card formatted wrong...
Please help :)

Hai... Great work sir. Iam doing a project to send...

2011-10-04T07:15:42.406-07:00

Hai...
Great work sir. Iam doing a project to send 32 bit data from atmega32 to pc using RS232 serial communication. I know to transfer 8 bit data but I dont know how to transfer 32 bit data. Please help me.

Regards,
Shahgufta