You can do this by closing the Schematic editor. To add a 0 ohm resistor in Eagle board layout, you need to de-link the PCB editor from the Schematic editor. Tip: when I started laying out the PCB, I did not know if I needed any 0 ohm resistors or where they should be located. I opted to use a jumper wire to save time, instead of trying to change the component placement and re-route the entire board. There are 2 other 0 ohm resistors in my design. Note the use of a jumper wire at the top left of the pcb layout diagram. Since I was only interested in implementing the PDI and ISP protocols, I left out the TPI programming interface, to reduce the dimensions of the PCB. The AVRISP-MkII clone project at fourwalledcubicle supports PDI, ISP and TPI programming. My main references for this project were: There are 2 steps involved in building the FabPDI-t90usb programmer: ![]() ![]() Since the FabPDI-t90usb board is a clone of the AVRISP-MkII, it will work directly with standard versions of AVRDUDE without any need to patch the software. You could substitute the AT90usb162 by other members of the AT90usb family or the ATmega16U2 or higher devices, as long as it has > 16 kB memory and hardware USB support. The FabPDI-t90usb programmer is a PDI/ISP programmer, based on Atmel's AVRISP-MkII.
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