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Hi everyone, I'm trying to send via bluetooth a discrete signal to NXT brick, I have been searching C libraries to see if it's posible but I still don't find nothing. Do you know if it's posible to do that? The signal comes from a A/D device, thank you for help.

Can you be more specific about what you are asking? Can you tell us more about your project, available HW, limitations, language you want to use, what you need help with, etc.?

Have a look here: http://bricxcc.sourceforge.net/nbc/nxcd ... tions.html
I'm not really sure what you mean by 'discrete signal'.