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added two examples to String examples for String to integer conversion
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Tom Igoe
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build/shared/examples/8.Strings/StringToInt/StringToInt.pde
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build/shared/examples/8.Strings/StringToInt/StringToInt.pde
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/*
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String to Integer conversion
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Reads a serial input string until it sees a newline, then converts
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the string to a number if the characters are digits.
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The circuit:
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No external components needed.
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created 29 Nov 2010
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by Tom Igoe
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This example code is in the public domain.
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*/
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// include the character conversion functions:
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#include <WCharacter.h>
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String inString = ""; // string to hold input
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void setup() {
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// Initialize serial communications:
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Serial.begin(9600);
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}
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void loop() {
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// Read serial input:
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while (Serial.available() > 0) {
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int inChar = Serial.read();
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if (isDigit(inChar)) {
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// convert the incoming byte to a char
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// and add it to the string:
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inString += (char)inChar;
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}
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// if you get a newline, print the string,
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// then the string's value:
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if (inChar == '\n') {
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Serial.print("Value:");
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Serial.println(inString.toInt());
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Serial.print("String: ");
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Serial.println(inString);
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// clear the string for new input:
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inString = "";
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}
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}
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}
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/*
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Serial RGB controller
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Reads a serial input string looking for three comma-separated
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integers with a newline at the end. Values should be between
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0 and 255. The sketch uses those values to set the color
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of an RGB LED attached to pins 9 - 11.
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The circuit:
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* Common-anode RGB LED cathodes attached to pins 9 - 11
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* LED anode connected to pin 13
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To turn on any given channel, set the pin LOW.
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To turn off, set the pin HIGH. The higher the analogWrite level,
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the lower the brightness.
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created 29 Nov 2010
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by Tom Igoe
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This example code is in the public domain.
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*/
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// include the character conversion functions:
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#include <WCharacter.h>
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String inString = ""; // string to hold input
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int currentColor = 0;
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int red, green, blue = 0;
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void setup() {
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// Initialize serial communications:
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Serial.begin(9600);
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// set LED cathode pins as outputs:
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pinMode(9, OUTPUT);
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pinMode(10, OUTPUT);
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pinMode(11, OUTPUT);
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// turn on pin 13 to power the LEDs:
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pinMode(13, OUTPUT);
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digitalWrite(13, HIGH);
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}
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void loop() {
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int inChar;
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// Read serial input:
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if (Serial.available() > 0) {
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inChar = Serial.read();
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}
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if (isDigit(inChar)) {
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// convert the incoming byte to a char
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// and add it to the string:
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inString += (char)inChar;
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}
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// if you get a comma, convert to a number,
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// set the appropriate color, and increment
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// the color counter:
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if (inChar == ',') {
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// do something different for each value of currentColor:
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switch (currentColor) {
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case 0: // 0 = red
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red = inString.toInt();
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// clear the string for new input:
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inString = "";
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break;
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case 1: // 1 = green:
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green = inString.toInt();
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// clear the string for new input:
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inString = "";
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break;
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}
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currentColor++;
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}
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// if you get a newline, you know you've got
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// the last color, i.e. blue:
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if (inChar == '\n') {
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blue = inString.toInt();
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// set the levels of the LED.
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// subtract value from 255 because a higher
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// analogWrite level means a dimmer LED, since
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// you're raising the level on the anode:
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analogWrite(11, 255 - red);
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analogWrite(9, 255 - green);
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analogWrite(10, 255 - blue);
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// print the colors:
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Serial.print("Red: ");
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Serial.print(red);
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Serial.print(", Green: ");
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Serial.print(green);
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Serial.print(", Blue: ");
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Serial.println(blue);
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// clear the string for new input:
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inString = "";
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// reset the color counter:
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currentColor = 0;
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}
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}
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/*
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Here's a Processing sketch that will draw a color wheel and send a serial
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string with the color you click on:
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// Subtractive Color Wheel with Serial
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// Based on a Processing example by Ira Greenberg.
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// Serial output added by Tom Igoe
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//
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// The primaries are red, yellow, and blue. The secondaries are green,
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// purple, and orange. The tertiaries are yellow-orange, red-orange,
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// red-purple, blue-purple, blue-green, and yellow-green.
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//
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// Create a shade or tint of the subtractive color wheel using
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// SHADE or TINT parameters.
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// Updated 29 November 2010.
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import processing.serial.*;
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int segs = 12;
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int steps = 6;
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float rotAdjust = TWO_PI / segs / 2;
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float radius;
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float segWidth;
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float interval = TWO_PI / segs;
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Serial myPort;
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void setup() {
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size(200, 200);
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background(127);
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smooth();
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ellipseMode(RADIUS);
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noStroke();
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// make the diameter 90% of the sketch area
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radius = min(width, height) * 0.45;
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segWidth = radius / steps;
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// swap which line is commented out to draw the other version
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// drawTintWheel();
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drawShadeWheel();
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// open the first serial port in your computer's list
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myPort = new Serial(this, Serial.list()[0], 9600);
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}
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void drawShadeWheel() {
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for (int j = 0; j < steps; j++) {
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color[] cols = {
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color(255-(255/steps)*j, 255-(255/steps)*j, 0),
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color(255-(255/steps)*j, (255/1.5)-((255/1.5)/steps)*j, 0),
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color(255-(255/steps)*j, (255/2)-((255/2)/steps)*j, 0),
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color(255-(255/steps)*j, (255/2.5)-((255/2.5)/steps)*j, 0),
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color(255-(255/steps)*j, 0, 0),
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color(255-(255/steps)*j, 0, (255/2)-((255/2)/steps)*j),
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color(255-(255/steps)*j, 0, 255-(255/steps)*j),
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color((255/2)-((255/2)/steps)*j, 0, 255-(255/steps)*j),
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color(0, 0, 255-(255/steps)*j),
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color(0, 255-(255/steps)*j, (255/2.5)-((255/2.5)/steps)*j),
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color(0, 255-(255/steps)*j, 0),
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color((255/2)-((255/2)/steps)*j, 255-(255/steps)*j, 0)
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};
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for (int i = 0; i < segs; i++) {
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fill(cols[i]);
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arc(width/2, height/2, radius, radius,
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interval*i+rotAdjust, interval*(i+1)+rotAdjust);
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}
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radius -= segWidth;
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}
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}
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void drawTintWheel() {
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for (int j = 0; j < steps; j++) {
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color[] cols = {
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color((255/steps)*j, (255/steps)*j, 0),
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color((255/steps)*j, ((255/1.5)/steps)*j, 0),
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color((255/steps)*j, ((255/2)/steps)*j, 0),
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color((255/steps)*j, ((255/2.5)/steps)*j, 0),
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color((255/steps)*j, 0, 0),
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color((255/steps)*j, 0, ((255/2)/steps)*j),
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color((255/steps)*j, 0, (255/steps)*j),
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color(((255/2)/steps)*j, 0, (255/steps)*j),
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color(0, 0, (255/steps)*j),
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color(0, (255/steps)*j, ((255/2.5)/steps)*j),
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color(0, (255/steps)*j, 0),
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color(((255/2)/steps)*j, (255/steps)*j, 0)
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};
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for (int i = 0; i < segs; i++) {
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fill(cols[i]);
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arc(width/2, height/2, radius, radius,
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interval*i+rotAdjust, interval*(i+1)+rotAdjust);
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}
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radius -= segWidth;
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}
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}
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void draw() {
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// nothing happens here
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}
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void mouseReleased() {
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// get the color of the mouse position's pixel:
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color targetColor = get(mouseX, mouseY);
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// get the component values:
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int r = int(red(targetColor));
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int g = int(green(targetColor));
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int b = int(blue(targetColor));
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// make a comma-separated string:
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String colorString = r + "," + g + "," + b + "\n";
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// send it out the serial port:
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myPort.write(colorString );
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}
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*/
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