arduino Time Management Non-blocking blinky with millis()
Example
This is very close to an example from the arduino docs:
// set constants for blinking the built-in LED at 1 Hz
#define OUTPIN LED_BUILTIN
#define PERIOD 500 // this is in milliseconds
int ledState = LOW;
// millis() returns an unsigned long so we'll use that to keep track of time
unsigned long lastTime = 0;
void setup() {
// set the digital pin as output:
pinMode(OUTPIN, OUTPUT);
}
void loop() {
unsigned long now = millis();
if (now - lastTime >= PERIOD) // this will be true every PERIOD milliseconds
{
lastTime = now;
if (ledState == LOW)
{
ledState = HIGH;
}
else
{
ledState = LOW;
}
digitalWrite(OUTPIN, ledState);
}
// now there's lots of time to do other stuff here
}
Using millis() in this way - to time operations in a non-blocking way - is something that is needed quite frequently, so consider using the elapsedMillis library for this.
