/*
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 pulsewidth
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
created 29 Dec. 2008
modified 9 Apr 2012
by Tom Igoe
This example code is in the public
domain.
*/
#include <SoftwareSerial.h>
SoftwareSerial mySerial(255, 2);
// These constants won't change. They're
used to give
names
// to the pins used:
const int analogInPin = A2; // Analog
input pin that
the potentiometer is attached to
const int analogOutPin = 3; // 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:
mySerial.begin(9600);
pinMode(analogOutPin, OUTPUT);
digitalWrite(analogOutPin, LOW);
}
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:
// print the results to the serial
monitor:
mySerial.print("sensor = " );
mySerial.print(sensorValue);
mySerial.print("\t output = ");
mySerial.println(outputValue);
// wait 2 milliseconds before the next
loop
// for the analog-to-digital converter
to settle
// after the last reading:
delay(200);
}