Shift Register (74HC595)
Has three inputs and eight outputs: allows the Arduino to control many outputs at once without as many pins as it would otherwise need.
Output (11)
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Infrared Remote
Sends infrared light pulses that can be read by an Infrared Receiver.
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Stepper Motor
Electrical connector to power motor and receive movement instructions from Arduino. Output shaft can rotate with motor continuously in either direction.
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LCD Character Display Module
Displays rows of text
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Servo Motor
Motor that rotates to an absolute position
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Light Emitting Diode (LED)
Illuminates when power flows through. It is a diode, so only allows power to flow in one direction.
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Passive Buzzer
Makes variable-pitch beeping, driven by the frequency of a changing (alternating current) power source connected to it.
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Active Buzzer
Makes a high-pitched beeping sound when powered with a steady (direct current) power source.
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Pancake Vibration Motor
Vibrates quickly when powered. Usually used as a simple tactile signal. Operates at 5V.
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DC Motor
The motor spins when power flows through its wires. Output shaft can rotate continuously in either direction.
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H-Bridge Motor Driver
Receives motion instructions from the Arduino, and provides power to two motors.