Question

25. It is my contention that the most important input sensor is the switch/pushbutton. How can you avoid having to add an extemal pull-up resistor when a switch is connected to a digital pin? 26. Some of the pins have the tilde() symbol written before their number. What does this mean? 27. The Arduino pins A0 through AS are written on the board as ANALOG IN and can read OV to 5V). The analogRead(pin) function reads the voltages as raw integer values that can go from 0 to what umber? 28. There seems to be no ANALOG OUT words printed on the Arduino. But I know analog output can be done. What pin numbers can do this and, how are they identified? Note I have asked this question in different terms earlier so don't panic! D Focus 10 ere to search

Answer 1

Answer 25
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Pull-up resistors are simple fixed value resistors, that are connected between the voltage supply and the particular pin. These resistors are used in digital logic circuits to ensure a logic level at a pin, which results in state wherein the input/output voltage is nonexistence driving signal.

Answer 26
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These pins act as normal digital pins but can also be used for Pulse-Width Modulation (PWM), which simulates analog output like fading an LED in and out.

Answer 27
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This means that it will map input voltages between 0 and 5 volts into integer values between 0 and 1023.

Answer 28
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analogWrite() 3, 5, 6, 9, 10, 11 are oup pins

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