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  • realnomis commented on mnedix's instructable AVR High voltage programming (Fuses rescue)9 months ago
    AVR High voltage programming (Fuses rescue)

    one more thing, i am using a Atmega 328 as IC1 (the programmer) I compiled the c file in atmel studio to accomodate the 328 and uploaded the new hex file with an atmel ice programmer :-)

    Ok i got it working, and it's really great. I am resurrecting both Atmega328 and 328P processors, it takes like 2 seconds :-) Great!Of course the emitter has to be tied to ground, it still looks like wrong orientation in your picture but maybe the picture is fooling me? BTW i am using a BC337 transistor which is almost the same as a 338. I guess it's just acting as a switch on the IC2 reset so about any bjt transistor should work.I did the PCB on a milling machine and had to do my own modification to the board layout, it's quite impossible to solder ic socket on the top with a ground plane just 8mils from the pad :-D I changed the fuse settings to match the default in Atmega 328P, the new values is:HFUSE0xD9LFUSE0x62I found the values from the link in the code:http://www.engbedded.com/c...see more »Ok i got it working, and it's really great. I am resurrecting both Atmega328 and 328P processors, it takes like 2 seconds :-) Great!Of course the emitter has to be tied to ground, it still looks like wrong orientation in your picture but maybe the picture is fooling me? BTW i am using a BC337 transistor which is almost the same as a 338. I guess it's just acting as a switch on the IC2 reset so about any bjt transistor should work.I did the PCB on a milling machine and had to do my own modification to the board layout, it's quite impossible to solder ic socket on the top with a ground plane just 8mils from the pad :-D I changed the fuse settings to match the default in Atmega 328P, the new values is:HFUSE0xD9LFUSE0x62I found the values from the link in the code:http://www.engbedded.com/cgi-bin/fc.cgiGood simple project! Thank you.

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  • realnomis commented on mnedix's instructable AVR High voltage programming (Fuses rescue)9 months ago
    AVR High voltage programming (Fuses rescue)

    Hi there. I did a build of this and am using the atmega 328. If i look at your picture it looks like the BC338 is upside down compared to the schematic?? Should the collector be connected to Vin or should the Emitter?

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