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69 lines
1.8 KiB
C++
69 lines
1.8 KiB
C++
/*
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Reading a serial ASCII-encoded string.
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This sketch demonstrates the Serial parseInt() function.
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It looks for an ASCII string of comma-separated values.
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It parses them into ints, and uses those to fade an RGB LED.
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Circuit: Common-Cathode RGB LED wired like so:
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- red anode: digital pin 3
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- green anode: digital pin 5
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- blue anode: digital pin 6
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- cathode: GND
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created 13 Apr 2012
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by Tom Igoe
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modified 14 Mar 2016
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by Arturo Guadalupi
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This example code is in the public domain.
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*/
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// pins for the LEDs:
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const int redPin = 3;
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const int greenPin = 5;
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const int bluePin = 6;
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void setup() {
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// initialize serial:
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Serial.begin(9600);
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// make the pins outputs:
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pinMode(redPin, OUTPUT);
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pinMode(greenPin, OUTPUT);
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pinMode(bluePin, OUTPUT);
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}
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void loop() {
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// if there's any serial available, read it:
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while (Serial.available() > 0) {
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// look for the next valid integer in the incoming serial stream:
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int red = Serial.parseInt();
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// do it again:
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int green = Serial.parseInt();
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// do it again:
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int blue = Serial.parseInt();
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// look for the newline. That's the end of your
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// sentence:
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if (Serial.read() == '\n') {
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// constrain the values to 0 - 255 and invert
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// if you're using a common-cathode LED, just use "constrain(color, 0, 255);"
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red = 255 - constrain(red, 0, 255);
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green = 255 - constrain(green, 0, 255);
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blue = 255 - constrain(blue, 0, 255);
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// fade the red, green, and blue legs of the LED:
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analogWrite(redPin, red);
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analogWrite(greenPin, green);
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analogWrite(bluePin, blue);
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// print the three numbers in one string as hexadecimal:
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Serial.print(red, HEX);
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Serial.print(green, HEX);
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Serial.println(blue, HEX);
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}
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}
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}
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