Vermes
Advanced Member level 4
It is a AVR microcontroller programmer. This construction is unique, because although it has small amount of elements and simple handling, it provides convenience of the USB bus (hot plug, current efficiency up to 500mA, compatibility with almost any computer and handling of a wide range of AVR microcontrollers.
Schematic and PCB:
Schematic can be found at: LINK.
Design of the board was also inspired by that project, although it was modified by adapting the size to the housing and adding two Zener diodes (3,6V), which are used for determining the appropriate level of USB signals tension.
PCB was printed with laser printer on chalky paper, then etched in B327.
Elements:
Due to the fact that Atmega8 can be not so easy to get and program. As an alternative, you can create a BSD programmer (direct connectrion of LPT pins with legs of the chip), which can be used for programming Atmega8 and for learning how to handle AVRDude.
Starting:
After connecting the system, computer asks for drivers and then after giving path, installs USBasp.
Pictures:
Schematic:
View of paths:
Board in the end of etching:
Taken out from the solution:
Cleaned of toner:
Assembled (system connected):
View of paths (one capacitor soldered from the bottom:
In housing:
Link to original thread (useful attachment) – Programator USBasp