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Additionally the 5V and two GND Arduino pins are also required to power up the Relay Shield. Some practical relay applications include: control of high voltage using low voltage, motor control, remote control, anti-hearing alarm, automatic temperature alarm, incubators and son on. A Too-Simple Arduino Library for Handling the Seeeduino Relay Shield (and Generic Relays) Again, no music. Dste discussed the Sparkfun Voicebox Shield in a previous entry.