Do not try to drive a relay directly with the arduino. Most relays require a lot more current than is wise to drive with the arduino. It will be far better to just use a transistor so you don't risk damaging the Arduino.
Do not try to drive a relay directly with the arduino. Most relays require a lot more current than is wise to drive with the arduino. It will be far better to just use a transistor so you don't risk damaging the Arduino.