USB for AVR

[Rufio]

hello again freinds.....i want to make a programmer for AVR using USB input from my LAPTOP...I DO NOT WANT TO BUY AN ALREADY DESIGNED PROGRAMMER OF THIS TYPE as suggested in most of the forums...how do i go about it...

 

[misterT]

Look at this project: fischl.de - USBasp - USB programmer for Atmel AVR controllers

 

[Laen]

The LUFA libraries have an AVRISPMkII-compatible project.

You might look at **broken link removed** for an example of what a good programmer would look like, circuit-wise.

 

[tlight]

The LUFA (Four Walled Cubicle - LUFA (Formerly MyUSB)) library AVRISPMKII project is an excellent way to go if you plan to use an atmel USB chip ie the at90usb162, atmega32u2 etc. It supports 3 current protocols used by atmel chips. the common ISP for most 8bit chips, PDI for the xmega line and TPI for the new attiny4,5,9 and 10 6pin chips. If all you need is ISP then any of the bitbanged programers out there will do. There are several good ones including the one from (USBtiny-based AVR Programmer) which offers code, schematic and board files. That code originated from (USBtiny) which also works well. I am rather partial to my programmer and the LUFA library but there are simpler solutions if all you need is ISP.