Non-blocking breathing led for arduino…

i needed a version of the ‘breathing led’ for a project which would not block everything else. button presses and the actual application should run without delay. after all it would just be cosmetics 😉

the result looks like this:

here is my non-blocking code for a breathing led with arduino:

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[sourcecode lang="c"]
/*
"Breathing non-blocking sleep LED."
Florian Klien 2011
blog.flo.cx
based on work from Jeremy Saglimbeni (thecustomgeek.com)
*/
#define LED 5 // any PWM led will do
unsigned long status_breathe_time = millis();
int breathe_delay = 10;
boolean breathe_up = true;
int breathe_i = 15;

void setup() { // bring the LED up nicely from being off
for(i = 0 ; i <= 15; i+=1)
{
analogWrite(11, i);
delay(5);
}
}

void loop()
{
nonBlockingBreathe();
otherImportantNonBlockingStuff();
}

void nonBlockingBreathe(){
if( (status_breathe_time + breathe_delay) < millis() ){
analogWrite(LED, breathe_i);
status_breathe_time = millis();
if (breathe_up == true){
if (breathe_i > 150) {
breathe_delay = 4;
}
if ((breathe_i > 125) && (breathe_i < 151)) {
breathe_delay = 5;
}
if (( breathe_i > 100) && (breathe_i < 126)) {
breathe_delay = 7;
}
if (( breathe_i > 75) && (breathe_i < 101)) {
breathe_delay = 10;
}
if (( breathe_i > 50) && (breathe_i < 76)) {
breathe_delay = 14;
}
if (( breathe_i > 25) && (breathe_i < 51)) {
breathe_delay = 18;
}
if (( breathe_i > 1) && (breathe_i < 26)) {
breathe_delay = 19;
}
breathe_i += 1;
if( breathe_i >= 255 ){
breathe_up = false;
}
}else{
if (breathe_i > 150) {
breathe_delay = 4;
}
if ((breathe_i > 125) && (breathe_i < 151)) {
breathe_delay = 5;
}
if (( breathe_i > 100) && (breathe_i < 126)) {
breathe_delay = 7;
}
if (( breathe_i > 75) && (breathe_i < 101)) {
breathe_delay = 10;
}
if (( breathe_i > 50) && (breathe_i < 76)) {
breathe_delay = 14;
}
if (( breathe_i > 25) && (breathe_i < 51)) {
breathe_delay = 18;
}
if (( breathe_i > 1) && (breathe_i < 26)) {
breathe_delay = 19;
}
breathe_i -= 1;
if( breathe_i <= 15 ){
breathe_up = true;
breathe_delay = 970;
}
}
}
}
[/sourcecode]

original code came from thecustomgeek.com

2 replies on “Non-blocking breathing led for arduino…”

Also das hätte jetzt schon etwas fancier statt der vielen bedingten Anweisungen sein können 😉

…
int breathe_i;
int breathe_delay;
int upper_limit;

for (upper_limit=150; upper_limit>0; upper_limit-=25)
if (breathe_i > upper_limit)
{
breathe_delay = 19 – pow((upper_limit / 25), 1.5);
break;
}
…

naja gut 🙂

2 replies on “Non-blocking breathing led for arduino…”

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