- These constants won't change const int analogPin = A0 pin that the sensor is attached to const int ledPin = 13 pin that the LED is attached to

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
/* Conditionals - If statement This example demonstrates the use of if() statements. It reads the state of a potentiometer (an analog input) and turns on an LED only if the LED goes above a certain threshold level. It prints the analog value regardless of the level. 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 13 to ground * Note: On most Arduino boards, there is already an LED on the board connected to pin 13, so you don't need any extra components for this example. created 17 Jan 2009 modified 4 Sep 2010 by Tom Igoe This example code is in the public domain. http://arduino.cc/en/Tutorial/IfStatement
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: */ // These constants won't change: const int analogPin = A0; // pin that the sensor is attached to const int ledPin = 13; // pin that the LED is attached to const int threshold = 400; // an arbitrary threshold level that's in the range of the analog input t void setup() { // initialize the LED pin as an output: pinMode(ledPin, OUTPUT); // initialize serial communications: Serial.begin(9600); } void loop() { // read the value of the potentiometer: int analogValue = analogRead(analogPin); // if the analog value is high enough, turn on the LED: if (analogValue > threshold) { digitalWrite(ledPin, HIGH); } else { digitalWrite(ledPin,LOW); } // print the analog value: Serial.println(analogValue, DEC); }...
View Full Document

This note was uploaded on 01/31/2011 for the course CS 302 taught by Professor J.parker during the Spring '08 term at University of Texas at Austin.

Ask a homework question - tutors are online