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Updating examples.

This commit is contained in:
David A. Mellis
2007-04-23 15:43:12 +00:00
parent 52a40bfac9
commit a587bc8a4a
44 changed files with 621 additions and 2034 deletions

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/*
* AnalogInput
* by DojoDave <http://www.0j0.org>
*
* Turns on and off a light emitting diode(LED) connected to digital
* pin 13. The amount of time the LED will be on and off depends on
* the value obtained by analogRead(). In the easiest case we connect
* a potentiometer to analog pin 2.
*
* http://www.arduino.cc/en/Tutorial/AnalogInput
*/
int potPin = 2; // select the input pin for the potentiometer
int ledPin = 13; // select the pin for the LED
int val = 0; // variable to store the value coming from the sensor
void setup() {
pinMode(ledPin, OUTPUT); // declare the ledPin as an OUTPUT
}
void loop() {
val = analogRead(potPin); // read the value from the sensor
digitalWrite(ledPin, HIGH); // turn the ledPin on
delay(val); // stop the program for some time
digitalWrite(ledPin, LOW); // turn the ledPin off
delay(val); // stop the program for some time
}

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// Fading LED
// by BARRAGAN <http://people.interaction-ivrea.it/h.barragan>
int value = 0; // variable to keep the actual value
int ledpin = 9; // light connected to digital pin 9
void setup()
{
// nothing for setup
}
void loop()
{
for(value = 0 ; value <= 255; value+=5) // fade in (from min to max)
{
analogWrite(ledpin, value); // sets the value (range from 0 to 255)
delay(30); // waits for 30 milli seconds to see the dimming effect
}
for(value = 255; value >=0; value-=5) // fade out (from max to min)
{
analogWrite(ledpin, value);
delay(30);
}
}

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/* Knock Sensor
* by DojoDave <http://www.0j0.org>
*
* Program using a Piezo element as if it was a knock sensor.
*
* We have to basically listen to an analog pin and detect
* if the signal goes over a certain threshold. It writes
* "knock" to the serial port if the Threshold is crossed,
* and toggles the LED on pin 13.
*
* http://www.arduino.cc/en/Tutorial/Knock
*/
int ledPin = 13; // led connected to control pin 13
int knockSensor = 0; // the knock sensor will be plugged at analog pin 0
byte val = 0; // variable to store the value read from the sensor pin
int statePin = LOW; // variable used to store the last LED status, to toggle the light
int THRESHOLD = 100; // threshold value to decide when the detected sound is a knock or not
void setup() {
pinMode(ledPin, OUTPUT); // declare the ledPin as as OUTPUT
Serial.begin(9600); // use the serial port
}
void loop() {
val = analogRead(knockSensor); // read the sensor and store it in the variable "val"
if (val >= THRESHOLD) {
statePin = !statePin; // toggle the status of the ledPin (this trick doesn't use time cycles)
digitalWrite(ledPin, statePin); // turn the led on or off
Serial.println("Knock!"); // send the string "Knock!" back to the computer, followed by newline
}
delay(100); // we have to make a delay to avoid overloading the serial port
}

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/*
* Smoothing
* David A. Mellis <dam@mellis.org>
*
* Reads repeatedly from an analog input, calculating a running average
* and printing it to the computer.
*
* http://www.arduino.cc/en/Tutorial/Smoothing
*/
// Define the number of samples to keep track of. The higher the number,
// the more the readings will be smoothed, but the slower the output will
// respond to the input. Using a #define rather than a normal variable lets
// use this value to determine the size of the readings array.
#define NUMREADINGS 10
int readings[NUMREADINGS]; // the readings from the analog input
int index = 0; // the index of the current reading
int total = 0; // the running total
int average = 0; // the average
int inputPin = 0;
void setup()
{
Serial.begin(9600); // initialize serial communication with computer
for (int i = 0; i < NUMREADINGS; i++)
readings[i] = 0; // initialize all the readings to 0
}
void loop()
{
total -= readings[index]; // subtract the last reading
readings[index] = analogRead(inputPin); // read from the sensor
total += readings[index]; // add the reading to the total
index = (index + 1); // advance to the next index
if (index >= NUMREADINGS) // if we're at the end of the array...
index = 0; // ...wrap around to the beginning
average = total / NUMREADINGS; // calculate the average
Serial.println(average); // send it to the computer (as ASCII digits)
}