Hi all,
i would like to use my computer's printer port to control an external relay, to switch on and off common electrical's appliances.
I can see about 5 Volts coming from the port, but even if the relay says that just 3 Volts would be enough, it doesn't works.
I found some suggestions online about using a "Darlington's pair" and also using 2 wires from the printer's port instead of just one (plus the ground wire), but none of this worked out.....
Can someone in the knows please point me out to the right direction ?
Thank you so much, Tom.
i would like to use my computer's printer port to control an external relay, to switch on and off common electrical's appliances.
I can see about 5 Volts coming from the port, but even if the relay says that just 3 Volts would be enough, it doesn't works.
I found some suggestions online about using a "Darlington's pair" and also using 2 wires from the printer's port instead of just one (plus the ground wire), but none of this worked out.....
Can someone in the knows please point me out to the right direction ?
Thank you so much, Tom.