I need to control a coffee machine plugged into a wall outlet using a relay connected to an arduino. Apparently I need to connect a transistor to the relay. Why? Is it because the arduino can't supply enough current to trigger the coil in the relay?
So the info on the packaging of this relay says "R46-5D12-12 ROHS SPDT 12A-12VDC". How do I go about choosing a transistor? Will I need anything else other than a diode?
edit: The relay will need to be triggered for about 0.5 - 1 seconds every once in a while. The load is definitely not big. It'll simply replace the power button on the coffee machine with an arduino.