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Hi. First of all, I want to apologize to answer so late. Here it is the schematic with the correction that DavidV12 show me: there is a 1μF capacitor between the AREf pin and the ground so you don't have to call analogReference(EXTERNAL) before doing any analogRead() calls to avoid potential damage.Hope this could be useful to you.
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Hi David. You're totally right: I didn't notice this important thing. There must be a 1μF capacitor between the AREf pin and the ground. Anyway the board works good with a project that i have tested. I will improve my knowledge about this microcontroller to avoid other mistakes. Thank you so much for writing me about this.
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I've drawn a circuit of a standalone Atmel328, then i've just put together all as the tutorial explain. As soon as possible i'll made a tutorial of the stand alone =D
I have had the same problem, but because i've used the 1.0.6 IDE of arduino. You can solve it in two ways:- put this at the top of the code:#define NOT_AN_INTERRUPT -1- download the new version of arduino IDELet me know if it works ;)