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