/*
Blink without Delay
Turns on and off a light emitting diode (LED) connected to a digital pin,
without using the delay() function. This means that other code can run at the
same time without being interrupted by the LED code.
The circuit:
- Use the onboard LED.
- Note: Most Arduinos have an on-board LED you can control. On the UNO, MEGA
and ZERO it is attached to digital pin 13, on MKR1000 on pin 6. LED_BUILTIN
is set to the correct LED pin independent of which board is used.
If you want to know what pin the on-board LED is connected to on your
Arduino model, check the Technical Specs of your board at:
https://www.arduino.cc/en/Main/Products
created 2005
by David A. Mellis
modified 8 Feb 2010
by Paul Stoffregen
modified 11 Nov 2013
by Scott Fitzgerald
modified 9 Jan 2017
by Arturo Guadalupi
This example code is in the public domain.
https://www.arduino.cc/en/Tutorial/BuiltInExamples/BlinkWithoutDelay
*/// constants won't change. Used here to set a pin number:
constintledPin=LED_BUILTIN;// the number of the LED pin
// Variables will change:
intledState=LOW;// ledState used to set the LED
// Generally, you should use "unsigned long" for variables that hold time
// The value will quickly become too large for an int to store
unsignedlongpreviousMillis=0;// will store last time LED was updated
// constants won't change:
constlonginterval=1000;// interval at which to blink (milliseconds)
voidloop(){// here is where you'd put code that needs to be running all the time.
// check to see if it's time to blink the LED; that is, if the difference
// between the current time and last time you blinked the LED is bigger than
// the interval at which you want to blink the LED.
unsignedlongcurrentMillis=millis();if(currentMillis-previousMillis>=interval){// save the last time you blinked the LED
previousMillis=currentMillis;// if the LED is off turn it on and vice-versa:
if(ledState==LOW){ledState=HIGH;}else{ledState=LOW;}// set the LED with the ledState of the variable:
digitalWrite(ledPin,ledState);}}