All you need to energize the coil of the relay is a tiny current, which you can control with the Raspberry Pi (though not directly, but with additional circuitry).
The boards are stackable, just like the Mega-IO, so you can stack up to 8 of them for a total of 64 relays per Raspberry Pi.
Connect the 5V Pi pin to the relay board's Vcc pin.
Connect the Pi's ground pin to the relay board's ground pin.
Connect GPIO pin 22 to the transistor circuit's input and the relay board's IN1 pin to the output.
A relay allows you to turn on or off a circuit with far more voltage and/or current than Arduino can handle. The low-voltage circuit on the Arduino side and the high-voltage side controlling the load are completely isolated by the relay.
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