Can i connect PC parallel port output directly to arduino digital input pin?
The parallel port sources 15mA(as in theory)
I checked the output voltage to be 3.367V....I am not able to measure the output current.......
Can i connect PC parallel port output directly to arduino digital input pin?
Yes you can as long as you also connect a ground wire between the PC port and the Arduino. As far a current drive requirement, an Arduino digital input pin is very high impedance that requires almost no current, just logic voltage levels.
Lefty
For readers who want to know more about the parallel port, in general (not much Arduino specific stuff) see....
Note that most of what you read there is only relevant if you have a "real" parallel port (which is easily added with a cheap board), not a "parallel port via USB" solution.