| /* | |
| Analog input, analog output, serial output | |
| Reads an analog input pin, maps the result to a range from 0 to 255 and uses | |
| the result to set the pulse width modulation (PWM) of an output pin. | |
| Also prints the results to the Serial Monitor. | |
| The circuit: | |
| - potentiometer connected to analog pin 0. | |
| Center pin of the potentiometer goes to the analog pin. | |
| side pins of the potentiometer go to +5V and ground | |
| - LED connected from digital pin 9 to ground through 220 ohm resistor | |
| created 29 Dec. 2008 | |
| modified 9 Apr 2012 | |
| by Tom Igoe | |
| This example code is in the public domain. | |
| https://www.arduino.cc/en/Tutorial/BuiltInExamples/AnalogInOutSerial | |
| */ | |
| // These constants won't change. They're used to give names to the pins used: | |
| const int analogInPin = A0; // Analog input pin that the potentiometer is attached to | |
| const int analogOutPin = 9; // Analog output pin that the LED is attached to | |
| int sensorValue = 0; // value read from the pot | |
| int outputValue = 0; // value output to the PWM (analog out) | |
| void setup() { | |
| // initialize serial communications at 9600 bps: | |
| Serial.begin(9600); | |
| } | |
| void loop() { | |
| // read the analog in value: | |
| sensorValue = analogRead(analogInPin); | |
| // map it to the range of the analog out: | |
| outputValue = map(sensorValue, 0, 1023, 0, 255); | |
| // change the analog out value: | |
| analogWrite(analogOutPin, outputValue); | |
| // print the results to the Serial Monitor: | |
| Serial.print("sensor = "); | |
| Serial.print(sensorValue); | |
| Serial.print("\t output = "); | |
| Serial.println(outputValue); | |
| // wait 2 milliseconds before the next loop for the analog-to-digital | |
| // converter to settle after the last reading: | |
| delay(2); | |
| } | |