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mishradk
01-30-2006, 05:35 AM
Hi people..
I am again into a problem. I dont have LPT in my laptop and my serial port is alwasy connected to some other device.

have you people chked out any USB programmer?
I saw one ...
http://shop.tuxgraphics.org/electronic/microcontroller.html?id=0bfb5d
looks like a good programmer but i have not tried one...
I am talking about AVR programmer USB, stk500 V2 compatible

Please llet me know your views...
regards
mishradk

ice
01-30-2006, 07:59 AM
Try a USB to serial converter.

But they are a bit on the expensive side.

vikas
01-30-2006, 02:13 PM
they cost just 200 buks .. not that expensive :)

ice
01-31-2006, 12:15 PM
You sure..?

It costs around 500 up here.

rao
01-31-2006, 12:39 PM
can you please mention the currency when you say "500 up here"...

Thanks
Rao

mishradk
01-31-2006, 09:36 PM
hi ...
I will be glad if any wan can look into the design and arch and give some view on it..

I don’t think when this type of USB programmer are available we should go for Serial programmer and use USB to serial converter for that...

As serial ports are not to be seen in the most modern computers / laptops it is better to switch over.

regards
Mishradk

ice
02-02-2006, 01:41 PM
$10 ..rao..
Thts the cheapest it can get over here.

Some of them work reliably...only when your laptop is powered by an adaptor.

mishradk
02-02-2006, 10:32 PM
hi Ice,
Can you please give me some url or product details that i can look into?
R u in US.. Me too..
Regards
Mishradk

firoz
06-06-2006, 10:16 AM
http://unpythonic.net/avr/usb/

usb avr programmer with PCB layout :P

Charlie
12-13-2006, 01:53 AM
http://www.fischl.de/usbasp/

regards

indrajeet
12-21-2006, 11:03 PM
If you really want a good usb programmer buy USB AVR Programmer form www.robokits.org.

It works fine with AVRDUDE, AVR STUDIO and some compilers also. Uses stk500v2 protocol.

It supports both serial and High voltage programming. Useful for using reset pin as a port pin!!!

one more thing very good support is available..

AVnetics
01-25-2010, 10:13 PM
USB to serial is just 150/-

Mayukh
01-26-2010, 10:33 AM
What does that mean (Rs 150/-)? Are you talking about an off the shelf RS232 - USB converter attached to your serial ISP? It wont work.. However, it works fine if you want to carry out USART operations, although you shall have to rig up a MAX 232 based TTL to serial converter first. And yeah, the programmer from robokits is good, but I couldnt make it work on my laptop. Havent got down to figuring out why. It works fine on other laptops including Windows 7 based systems. Could it be because its only USB 2.0 compliant?

Regards,
Mayukh.

Ulhas
01-26-2010, 11:00 AM
Go thru
http://elecrom.wordpress.com/2009/04/15/avrdude-tutorial-burning-hex-files-using-usbasp-and-avrdude/

This person sell this USBasp - USB programmer for Atmel AVR controllers for Rs. 300~350

regards

ulhas

AVnetics
01-26-2010, 04:49 PM
What does that mean (Rs 150/-)? Are you talking about an off the shelf RS232 - USB converter attached to your serial ISP? It wont work.. However, it works fine if you want to carry out USART operations, although you shall have to rig up a MAX 232 based TTL to serial converter first. And yeah, the programmer from robokits is good, but I couldnt make it work on my laptop. Havent got down to figuring out why. It works fine on other laptops including Windows 7 based systems. Could it be because its only USB 2.0 compliant?

Regards,
Mayukh.

OK , but why ? If u have a serial i/f programmer (just the converter sd work, as told in the site below )

however if one wants to build one i can help http://www.serasidis.gr/circuits/usbAvrProg/images/schematicSmall.gif
refer the circuit http://www.serasidis.gr/circuits/usbAvrProg/usbAvrProg.htm--> site tellls how to make one .

the site has all info + pcb + programmer software (all free)

u can drop IC1 as told there ... only thing u need is FT232BM sd be just 50Rs
with all parts u will spend 150Rs approx.

Mayukh
01-27-2010, 08:28 PM
I have tried hooking up the serial ISP to an off the shelf RS232 - USB converter. It did not work!! Thats because, as I understand it , it does not use the exact RS232 protocol. However, as I mentioned, for UART it works fine. You can try it out if you like.. Thanks for the link shall look it up shortly. Finally, have you checked out the FT232RL / BM datasheet. They make the IC about 7mm in size. Its a practical impossibility to solder it in place at home. So instead of buying TTL - USB converter, I built one TTL - serial converter and then attached a RS232 - USB converter to it and used it for UART using USB. It still works out cheaper than buying a TTL - USB converter..

By the way, does anyone know a good forum where I can post a guide I have written regarding interfacing an LCD with the mega8. It starts from scratch to a full fledged working LCD, in what I hope is an easy to use format. It contains source code, circuits, materials needed, pricing, explanations, etc from an Indian perspective. The file size (pdf) is 527KB. Additionally I also want to post the code as .c and .hex files for direct use..

Best Regards,
Mayukh.

Mayukh
01-27-2010, 08:33 PM
..By the way, FT232 chips are expensive. They cost upwards of Rs 250/- each. Buying one and not being able to use it is a waste...

Regards,
Mayukh.

AVnetics
01-27-2010, 09:42 PM
..By the way, FT232 chips are expensive. They cost upwards of Rs 250/- each. Buying one and not being able to use it is a waste...

Regards,
Mayukh.

fT232 is 20/- Rs in bangalore vishal electronics. retail prices are much less than the online prices .
That is a thruhole part ,smd will be hardly 50Rs. :)
try the one i gave , dun be negative i will help u out.

if you want a thru hole pcb design i can give you here (redesigning)

Never worry abt soldering ... learn it it will be easy !
Regarding soldering i did 209pin PQFP smd with cheap soldering iron.

Mayukh, i can post your guide on my blog..http://web-o-wikipedia.blogspot.com/
with your name if u wish!

Mayukh
01-28-2010, 06:45 PM
fT232 is 20/- Rs in bangalore vishal electronics. retail prices are much less than the online prices .
.............try the one i gave , dun be negative i will help u out.
...............Mayukh, i can post your guide on my blog..http://web-o-wikipedia.blogspot.com/
with your name if u wish!

Well, then buying things online seems to be daylight robbery...a 1200% profit margin - wow!! Thanks a lot for your offer of posting my guide on your blog, shall give it a serious thought. Yep, I was thinking of combining surface mount and through hole for finally assembling the 232RL. Maybe someday I shall do it that way. I am rarely negative about anything, sometimes, merely practical. Building a TTL - RS232 converter had cost me Rs. 103/- (dont miss the precison :-) ). An off the shelf RS232 - USB adaptor cost me Rs. 250. Total project cost therefore was Rs. 353/-.
The 232RL chip alone was Rs. 250/-. Finally, it would have made a marginal difference in price and a major difference in effort...

Thanks and regards,
Mayukh.

AVnetics
01-28-2010, 07:02 PM
So called glorified project sites taking advantages of indian market. Here in local market they sell 1000 only not 1 -2 pcs . I get my stuff ordered via a broker ..who works for companies .
My previous company used to order 7segment X4 digits in 60 cents !!! = 1.20Rs . Wholesale prices ..
But a kid when comes to shop , people sell each 7segment in 15 -20Rs so 4 digits =60Rs+ .....

You will become mad if u think!!!

I can build the full AVR programmer and sell , but i lack time to do that .