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 anybody know the input circuit diagram of Due digital inputs ?
in my case , the output from Due is ok since the device accepts also lower voltages (3,3 V),
lowering the voltage with resistance divider is of course one solution but if inputs work with 4,8 V , it saves some extra work,
BR,
Seppo