1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
/*
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-Cathode RGB LED wired like so:
- red anode: digital pin 3 through 220 ohm resistor
- green anode: digital pin 5 through 220 ohm resistor
- blue anode: digital pin 6 through 220 ohm resistor
- cathode: GND
created 13 Apr 2012
by Tom Igoe
modified 14 Mar 2016
by Arturo Guadalupi
This example code is in the public domain.
https://www.arduino.cc/en/Tutorial/BuiltInExamples/ReadASCIIString
*/
// 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);
}
}
}
|
