The PushButton is a component that connects two points in a circuit when you press it.
Dallas is a Digital Temperature Sensor that is controlled through a proprietary 1-wire protocol.
UltaSonic
An ultrasonic sensor detects the distance of the closest object in front of it.
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Photodiode is a light sensitive semiconductor diode which converts the light energy into voltage or current based on the mode of operation.
A Potentiometer is a simple knob that provides a variable resistance, which we can read into the Arduino board as an analog value.
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