If you have 12V, use the 12V relay.
If you have 5V, search for : relay shield 5V
The 5V from the Arduino Uno is not enough to power a few relays.
A relay shield with four 12V relays is about 8 dollars on Ebay.
If you have 12V, use the 12V relay.
If you have 5V, search for : relay shield 5V
The 5V from the Arduino Uno is not enough to power a few relays.
A relay shield with four 12V relays is about 8 dollars on Ebay.