Karan’s Arduino homework 2

Digital Input

Code for above example

<pre>

/*
Button

Turns on and off a light emitting diode(LED) connected to digital pin 13,
when pressing a pushbutton attached to pin 2.

The circuit:

  • LED attached from pin 13 to ground
  • pushbutton attached to pin 2 from +5V
  • 10K resistor attached to pin 2 from ground
  • Note: on most Arduinos there is already an LED on the board
    attached to pin 13. created 2005
    by DojoDave http://www.0j0.org
    modified 30 Aug 2011
    by Tom Igoe This example code is in the public domain. http://www.arduino.cc/en/Tutorial/Button
    */

// constants won’t change. They’re used here to set pin numbers:
const int buttonPin = 2; // the number of the pushbutton pin
const int ledPin = 13; // the number of the LED pin

// variables will change:
int buttonState = 0; // variable for reading the pushbutton status

void setup() {
// initialize the LED pin as an output:
pinMode(ledPin, OUTPUT);
// initialize the pushbutton pin as an input:
pinMode(buttonPin, INPUT);
}

void loop() {
// read the state of the pushbutton value:
buttonState = digitalRead(buttonPin);

// check if the pushbutton is pressed. If it is, the buttonState is HIGH:
if (buttonState == LOW) {
// turn LED on:
digitalWrite(ledPin, HIGH);
} else {
// turn LED off:
digitalWrite(ledPin, LOW);
}
}

</pre>

Serial Monitor + Analog Input

Code for above example

<pre>

// 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);
// map it to the range of the analog out:
outputValue = map(sensorValue, 0, 1023, 0, 255);
// change the analog out value:
analogWrite(analogOutPin, outputValue);

// print the results to the Serial Monitor:
Serial.print(“sensor = “);
Serial.print(sensorValue);
Serial.print(“\t output = “);
Serial.println(outputValue);

// wait 2 milliseconds before the next loop for the analog-to-digital
// converter to settle after the last reading:
delay(2);
}

</pre>

RGB Color Mixer

Code for above example

<pre>

// These constants won’t change. They’re used to give names to the pins used:
const int analogRedInPin = A0; // Analog input pin that the potentiometer is attached to
const int analogGreenInPin = A1;
const int analogBlueInPin = A2;

const int analogRedOutPin = 9; // Analog output pin that the LED is attached to
const int analogGreenOutPin = 10;
const int analogBlueOutPin = 11;

int redSensorValue = 0;// value read from the pot
int greenSensorValue = 0;
int blueSensorValue = 0;
int redOutputValue = 0; // value output to the PWM (analog out)
int greenOutputValue = 0;
int blueOutputValue = 0;

void setup() {
// initialize serial communications at 9600 bps:
Serial.begin(9600);
}

void loop() {
// read the analog in value:
redSensorValue = analogRead(analogRedInPin);
greenSensorValue = analogRead(analogGreenInPin);
blueSensorValue = analogRead(analogBlueInPin);

// map it to the range of the analog out:
redOutputValue = map(redSensorValue, 0, 1023, 0, 255);
greenOutputValue = map(greenSensorValue,0,1023,0,255);
blueOutputValue = map(blueSensorValue,0,1023,0,255);
// change the analog out value:
analogWrite(analogRedOutPin, redOutputValue);
analogWrite(analogGreenOutPin,greenOutputValue);
analogWrite(analogBlueOutPin,blueOutputValue);

// print the results to the Serial Monitor:
Serial.print(“red sensor = “);
Serial.print(redSensorValue);
Serial.print(“\t red output = “);
Serial.print(redOutputValue);
Serial.print(“green sensor = “);
Serial.print(greenSensorValue);
Serial.print(“\t blue output = “);
Serial.print(greenOutputValue);
Serial.print(“blue sensor = “);
Serial.print(blueSensorValue);
Serial.print(“\t blue output = “);
Serial.println(blueOutputValue);

// wait 2 milliseconds before the next loop for the analog-to-digital
// converter to settle after the last reading:
delay(2);
}

</pre>

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