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arduino-project-sketch/sensor-photoresistor.ino
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/* | |
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. | |
*/ | |
// 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); | |
float voltage= sensorValue * (3.3 / 1023.0); | |
Serial.println(voltage); | |
} |