/*
InkJetEncoderCount
Turns on and off a light emitting diode(LED) connected to digital
pin 13, when moving inkjet printhead. This light is blurry, so
added counter and serial port monitor output.
The circuit:
* LED attached from pin 13 to ground
* one of the outputs of the inkjet encoder is attached to pin 2
created 2012
by Scott Foerster
based upon the Button Example
This example code is in the public domain.
*/
// constants won't change. They're used here to
// set pin numbers:
const int buttonPin = 2; // the number of the encoder output is pushed into
const int ledPin = 13; // the number of the LED pin
int Cnt = 0; //counting number of shadows
// variables will change:
int buttonState = 0; // variable for reading the pushbutton status
void setup() {
// initialize the serial communications:
Serial.begin(9600);
// initialize the LED pin as an output:
pinMode(ledPin, OUTPUT);
// initialize the encoder output:
pinMode(buttonPin, INPUT);
}
void loop(){
// read the state of the encoder output
buttonState = digitalRead(buttonPin);
// check if the encoder is HIGH.
// if it is, the buttonState is HIGH:
if (buttonState == HIGH) {
// turn LED on:
digitalWrite(ledPin, HIGH);
Cnt++;
// print the counter value:
Serial.print(Cnt);
Serial.println();
}
else {
// turn LED off:
digitalWrite(ledPin, LOW);
}
}
