Analog In, Out Serial

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1/*
2
3  Analog input, analog output, serial output
4
5  Reads an analog input pin, maps the result to a range from 0 to 255 and uses
6
7  the result to set the pulse width modulation (PWM) of an output pin.
8
9  Also prints the results to the Serial Monitor.
10
11  The circuit:
12
13  - potentiometer connected to analog pin 0.
14
15    Center pin of the potentiometer goes to the analog pin.
16
17    side pins of the potentiometer go to +5V and ground
18
19  - LED connected from digital pin 9 to ground
20
21  created 29 Dec. 2008
22
23  modified 9 Apr 2012
24
25  by Tom Igoe
26
27  This example code is in the public domain.
28
29  https://www.arduino.cc/en/Tutorial/AnalogInOutSerial
30
31*/
32
33// These constants won't change. They're used to give names to the pins used:
34
35const int analogInPin = A0;  // Analog input pin that the potentiometer is attached to
36
37const int analogOutPin = 9; // Analog output pin that the LED is attached to
38
39int sensorValue = 0;        // value read from the pot
40int outputValue = 0;        // value output to the PWM (analog out)
41
42void setup() {
43
44  // initialize serial communications at 9600 bps:
45
46  Serial.begin(9600);
47}
48
49void loop() {
50
51  // read the analog in value:
52
53  sensorValue = analogRead(analogInPin);
54
55  // map it to the range of the analog out:
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57  outputValue = map(sensorValue, 0, 1023, 0, 255);
58
59  // change the analog out value:
60
61  analogWrite(analogOutPin, outputValue);
62
63  // print the results to the Serial Monitor:
64
65  Serial.print("sensor = ");
66
67  Serial.print(sensorValue);
68
69  Serial.print("\t output = ");
70
71  Serial.println(outputValue);
72
73  // wait 2 milliseconds before the next loop for the analog-to-digital
74
75  // converter to settle after the last reading:
76
77  delay(2);
78}