timers

Using Arduino Programming Questions
#1

I have 2 questions

1)what .setInterval() does exactly do ?I havent found a good explanation
2)I want to measure the distance using an ultrasonic sensor if the distance is less than 30 a vibration motor will vibrate
but i dont want that to happen in function void loop because it’s too large
i want it to happen every 1 second for example
and the rest of the code still run
I hope you understood me
how this is going to be done ?

#define trigPin 45
#define echoPin 44

#define trigPin2 41
#define echoPin2 40
 
float duration, distance;
float duration2, distance2;
int safetyDistance,safetyDistance2;

const int vib = 24;
const int buzzer = 22;
void setup() {
 pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(trigPin2, OUTPUT);
  pinMode(echoPin2, INPUT);
  ////////////////////////
  pinMode(buzzer, OUTPUT);
  pinMode(vib, OUTPUT);}
id loop() {// put your main code here, to run repeatedly:
  //the parts that keep repeating until the arduino is off
  /////////////////////////////////////////////////////////

  // Write a pulse to the HC-SR04 Trigger Pin
  digitalWrite(trigPin, LOW);// Clears the trigPin
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);// Sets the trigPin on HIGH state for 10 micro seconds to generate the ultrasound wave
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  // Measure the response from the HC-SR04 Echo Pin
  // Reads the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin, HIGH);
  
  // Determine distance from duration// Calculating the distance
  // Use 343 metres per second as speed of sound
  
  distance = (duration / 2) * 0.0343;
  
  // Prints the distance on the Serial Monitor
  Serial.print("Distance = ");
  Serial.print(distance);
  Serial.println(" cm   a");
  safetyDistance = distance;
  if (safetyDistance <= 10){
  digitalWrite(vib, HIGH);
  delay(500);
  digitalWrite(vib, LOW);}
  else{
  digitalWrite(vib, LOW);}
  Serial.print("\n");
  delay(10);
  ////////////////////////////////////////////////////////////////
  digitalWrite(trigPin2, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin2, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin2, LOW);
  
  // Measure the response from the HC-SR04 Echo Pin
 
  duration2 = pulseIn(echoPin2, HIGH);
  
  // Determine distance from duration
  // Use 343 metres per second as speed of sound
  
  distance2 = (duration2 / 2) * 0.0343;
  
  // Send results to Serial Monitor
 
  Serial.print("Distance = ");
  Serial.print(distance2);
  Serial.println(" cm   b");
  safetyDistance2 = distance2;
  if (safetyDistance2 <= 10){
  digitalWrite(buzzer, HIGH); delay(500); digitalWrite(buzzer, LOW);}
  else{digitalWrite(buzzer, LOW);}
  Serial.print("\n"); 
  }
#2

I have 2 questions

I have 1 question

How can we help if you don't post your code ?

#3

UKHeliBob:
I have 1 question

How can we help if you don't post your code ?

I posted the code

#4

so you want to put part(s) of your code in separate function(s) oh yes please,

  // Write a pulse to the HC-SR04 Trigger Pin
  digitalWrite(trigPin, LOW);// Clears the trigPin
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);// Sets the trigPin on HIGH state for 10 micro seconds to generate the ultrasound wave
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

could be :

  void pulseTrigger() {// Write a pulse to the HC-SR04 Trigger Pin
  digitalWrite(trigPin, LOW);// Clears the trigPin
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);// Sets the trigPin on HIGH state for 10 micro seconds to generate the 
                                         //ultrasound wave
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
}

and called by pulseTrigger(); within "id loop()" ? hey what happened to "vo" ? ach details..

check this Thread for the setInterval() it became clear to me by #3

#5

Now reading again your question 2 became more clear. OK so create the function you want to be executed once every second, then define the timer interval in setup() timer.setInterval(1000L, function);
and call from loop()timer.run();
your English got me a bit confused :wink:

#6

Deva_Rishi:

timer.setInterval(1000L, function);

what is L next to 1000?

#7

Deva_Rishi:
Now reading again your question 2 became more clear. OK so create the function you want to be executed once every second, then define the timer interval in setup() timer.setInterval(1000L, function);
and call from loop()timer.run();
your English got me a bit confused :wink:

It's not working, it only run the function when (timer.run()) it doesnt happen every one second
please help

#8

MovieFan1995:
please help

Post your complete code that actually compiles.

#9

MovieFan1995:
what is L next to 1000?

this

#10

respondents complain that people starting a thread sometimes are not complete in posting code and links, but respondents are sometimes not much better. So to show myself. the SimpleTimer library is hereI didn't find it in my library manager. this code:

#include "SimpleTimer.h"

SimpleTimer timer;

void setup() {
  Serial.begin(9600);
  timer.setInterval(1000L, function);

}

void loop() {
  timer.run();
}

void function() {
  Serial.println("Yes");
}

results in positive affirmations on the SerialMonitor once a second (given that the Baud rates match)

#11