Building STK500 AVR ISP programmer with USB

Programmer is one of the first things to think of when starting to deal with microcontrollers. Luckily it is not hard to build fully working programmer almost for any microcontroller as there are tons of open source projects around. So I decided to build stk500 compatible programmer which is actually taken from I decided not to search for same parts as in original schematics but use what’s on desk. As result I got mix of through hole and SMD soldered board that works great. Short info about STK500 V2 programmer This programmer is a clone of original AVR STK500 programmer. It works on all main platforms including Windows, Linux, BSD and MacOS X. This is mainly because as USB to serial converter there is a FT232RL chip used with full driver support. Probably main reason to build it is that programmer works in AVRstudio where microcontrollers can be programmed …

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Yet Another Simple AVR ISP cable

Probably this programmer cable can be found on every AVR fan website. It very simple and easy to build. You just need few passive components that can be packed inside LPT connector. From my perspective I wouldn’t recommend using this one programmer if you are more serious in microcontroller projects, because it has poor computer port protection. It connects directly to LPT port without precautions. I definitely recommend using similar ISP circuit with buffer IC between LPT and target board. But let’s don’t pretend like we are very smart. The whole beauty is in its simplicity. This thing does its job perfectly as long as target board power supply is OK.


AVRISP is very popular Parallel port programmer for flashing AVR type microcontrollers. Earlier I used programmer connected to com port, but frequently I needed this port for other purposes, I decided to make it work on parallel port. The programmer on parallel port is much simpler than connected to serial port, because there is no needed voltage adapter like MAX232. You can only connect your MCU directly to port. But for safety reasons there is good practice to use buffer ship like 74HC244. The header for programmer I used standard 6 pin ISP header. I wanted to make compact programmer, so I put circuit inside LPT head. Few pictures of it:   Programming is usually done by using PonyProg software. Bellow is its configuration: