How to add a LED to be triggered for 5 seconds without blocking any other code

Projects Programming
1

I want to be able to add a LED to be triggered for 5 seconds without blocking any other commands. I do not know how to do non-blocking delays and i need someones help. Thanks in advance

int ledPin = 7;
int Lswitch = 11;
int Stop1 = 12; //bottom
int Stop2 = 13; //top
int motor2pin1 = 2;
int motor2pin2 = 3;
int enB = 5;
int StatE = 0;
int blue = 0;

void setup() {
  // put your setup code here, to run once:
  pinMode(ledPin, OUTPUT);
  pinMode(Lswitch, INPUT_PULLUP);
  pinMode(motor2pin1, OUTPUT);
  pinMode(motor2pin2, OUTPUT);
  pinMode(enB, OUTPUT);
  pinMode(Stop1, INPUT_PULLUP);
  pinMode(Stop2, INPUT_PULLUP);
  Serial.begin(9600);
  if (digitalRead(Stop1) == LOW)
  {
    digitalWrite(motor2pin1, HIGH);
    digitalWrite(motor2pin2, LOW);
    analogWrite(enB, 50);
  }

  StatE = 1;
}

void loop() {
  // put your main code here, to run repeatedly:
  if (Serial.available() > 0) { // Checks whether data is comming from the serial port
    blue = Serial.read(); // Reads the data from the serial port
  }

  if ((digitalRead(Stop1) == HIGH) && (StatE == 1))
  {
    digitalWrite(motor2pin1, LOW);
    digitalWrite(motor2pin2, LOW);
    analogWrite(enB, 50);
  }

  if ((digitalRead(Stop2) == HIGH) && (StatE == 2))
  {
    digitalWrite(motor2pin1, LOW);
    digitalWrite(motor2pin2, LOW);
    analogWrite(enB, 50);
    digitalWrite(ledPin, HIGH);
  }

  if ((digitalRead(Stop2) == HIGH) && (blue == '1'))
  {
    digitalWrite(motor2pin1, HIGH);
    digitalWrite(motor2pin2, LOW);
    analogWrite(enB, 50);
    StatE = 1;
    blue = 0;
  }

  if ((digitalRead(Stop1) == HIGH) && (blue == '1'))
  {
    digitalWrite(motor2pin1, LOW);
    digitalWrite(motor2pin2, HIGH);
    analogWrite(enB, 50);
    StatE = 2;
    blue = 0;
  }
  if   ((digitalRead(Stop1) == LOW) && (digitalRead(Stop2) == LOW) && (blue == '1'))
  {
    blue = 0;
  }

}
2

When the led is switched on, you set a timer.

In the loop(), you check regularly if the timer has expired (your 5 seconds) and, if so, switch the led off.

4

How would I do this. I am not familiar with timers? I am not sure how to use them or Millis()

5 
uint32_t myTimer ;   // global
. . .
. . .

myTimer = millis() ; // set a timer

. . .
. . . 

if ( millis() - myTimer > 5000 ) { . . .    // test for expiry of timer
6

How would I implement this after a button press?

7

Am I right in assuming that you did not write the code in post #1 ?
This is an example from it of testing a button:

if ((digitalRead(Stop1) == LOW))
{
    // act on a button press . Button is high side so LOW is pressed and HIGH is not pressed
    // here you set the timer and switch the led on.
}
8

I did write the code I just am still new to arduino and not sure how to use timers. Would I put the If statement in the if statement? Thanks

9

The code will look something like this.
Test it stand alone before integrating it into the rest of your sketch to ensure it all works and you understand it.

const uint8_t myLedPin = X ; // choose a value for X
const uint8_t myButtonPin = Y ; // choose a value for Y
uint32_t myTimer ;

. . . 

void setup() {
    . . . 
    pinMode( myLedPin, OUTPUT ) ;
	pinMode( myButtonPin, INPUT_PULLUP ) ;
    . . .
}


void loop() {
   . . .
   if( digitalRead( myButtonPin == LOW ) {  // button wired so LOW = PRESSED..
      myTimer = millis() ;
	  digitalWrite( myLedPin, HIGH ) ;  // LED wired so HIGH = ON
   }
   if ( digitalRead( myLedPin ) == HIGH && millis() - myTimer > 5000 ) {
      digitalWrite( myLedPin, LOW ) ;
   }
   . . .   

}
10

Thank you very much for this. I will test it tomorrow it is very late where I Live. I will keep you updated

11

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