Hello! I have a external device (communicating with TTL level signals) which is working well with Arduino Mega 2560 R3 through digital IO pins of Mega, now if I try out Arduino Due with this device which writes 4, 82 volts (measured from pin) to Arduino input pin, is there a risk of damage , does…

I/O input pins voltage 5V

TCWORLD October 27, 2012, 1:12pm 2

The inputs of the Due are NOT 5v tollerant. If you try and apply a 5v signal (that includes 4.8v), you will damage the arm processor.

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