"you can always connect the LED to three pins and turn them on simultaneously (=120mA). Whatever you do, be sure to use a suitable resistor."
I am confused to read this ,
Is it right to connect three pins to one output :~(will it not burnt arduino pro mini 3.3v?) and if yes then is that current limiting resistance will run through each pin to output.Please clarify it?
Is it better alternative for transistor to amplify current to IR LED output from arduino?