Is it difficult to do high voltage parallel programming using Nick Gammon library?

Question

I have bricked a few AT328P by invalid fuse settings.

Has anybody used the above sketches and the associated circuitry to perform high voltage programming?

I've used them, they seem to work fine, otherwise I wouldn't have posted them. What invalid fuse settings anyway? If you changed the clock you can supply an external clock and fix them up. See bootloader uploader - the part about an alternate clock source. — Nick Gammon, Sep 24 '15 at 21:12
to be honest, I do not recall what I set the fuses to, but since then, I can upload sketches to the chip, but it will not run the program. — Mo Valli, Sep 24 '15 at 22:26
I have placed the chip in an arduino uno bored, but it still does not run. I haven't tried a lower frequency Crystal, could this work? — Mo Valli, Sep 24 '15 at 22:30
Also, in the reset circuit, Does the RC capacitor and The emitter Of Q1 both connect to ground? — Mo Valli, Sep 24 '15 at 22:34

Igor Stoppa · Accepted Answer · 2015-09-24 18:57:47Z

1

I have not tried with those instructions, as I have an AVRDragon, but it's a good exercise for precision, since you have to wire lots of pins.

20+ iirc

My guess is that if anything fails, it's likely to be because of a mistake in the wiring.

If you are planning to do it often, you might consider soldering the wires and the ZIF socket to a prototype board, to preserve your mental sanity.

answered Sep 24 '15 at 18:57

Igor Stoppa

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+1 for assuming the OP has some mental sanity in the first place.
– Majenko ♦
Sep 24 '15 at 21:44
Igor Stoppa insomnia
– Mo Valli
Sep 25 '15 at 11:19

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