Arduino Due provide how many signal output?

[kevin0616]

Hi, im using Arduino Due and I wish to control a relay by sending the HIGH and LOW signal to the coil. Im not too sure if i'm doing it right, can anyone show me how to connect the relay? For your information Im using a 3VDC relay without base and Im nt using any transistor or any other component. Just relay and arduino.
It can be powered by using 3.3V and GND connect to coil, but when i change the 3.3V from arduino to digital I/O pin, it cannot work already.

[Apis210]

Hi, Just relay and arduino.??? I don't think it will work.Experience told me extra circuit is needed such as transistor and etc. ULN2803A might be good choice to connect Arduino with relay.