Power button for obstacle detecting robot

Projects General Guidance
1

The button should be able to turn off and on the arduino, but I don't know where to start. I'm using a L293D shield and planning to set the button to pin 10.
This is the program without the button:

#include <AFMotor.h> 
int trigPin1 = A5;
int echoPin1 = A4;
int trigPin2 = A3;
int echoPin2 = A2;
int trigPin3 = A1;
int echoPin3 = A0;

AF_DCMotor motor1(3);  
AF_DCMotor motor2(4);
long duration1;
long duration2;
long duration3;
int distanceleft;
int distancefront;
int distanceright;

void setup() {
  pinMode(trigPin1, OUTPUT);
  pinMode(trigPin2, OUTPUT);
  pinMode(trigPin3, OUTPUT);
  pinMode(echoPin1, INPUT); 
  pinMode(echoPin2, INPUT);
  pinMode(echoPin3, INPUT);
  Serial.begin(9600); 
  
  motor1.setSpeed(255);   
  motor2.setSpeed(255);

}
void loop() {
  
  digitalWrite(trigPin1, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin1, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin1, LOW);
  duration1 = pulseIn(echoPin1, HIGH);
  distanceleft = duration1 * 0.034 / 2;
  Serial.print("Distance1: ");
  Serial.println(distanceleft);
  
  digitalWrite(trigPin2, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin2, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin2, LOW);
  duration2 = pulseIn(echoPin2, HIGH);
  distancefront = duration2 * 0.034 / 2;
  Serial.print("Distance2: ");
  Serial.println(distancefront);
  
  digitalWrite(trigPin3, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin3, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin3, LOW);
  duration3 = pulseIn(echoPin3, HIGH);
  distanceright = duration3 * 0.034 / 2;
  Serial.print("Distance3: ");
  Serial.println(distanceright);
  
  if ((distanceleft <= 15 && distancefront > 15 && distanceright <= 15) || (distanceleft > 15 && distancefront > 15 && distanceright > 15))
  {
    motor1.run(FORWARD);
    motor2.run(FORWARD);
  }
  if ((distanceleft <= 15 && distancefront <= 15 && distanceright > 15) || (distanceleft <= 15 && distancefront > 15 && distanceright > 15))
  {
    motor1.run(RELEASE);         
    motor2.run(RELEASE);
    delay(1000);
    motor1.run(FORWARD);         
    motor2.run(BACKWARD);        
    delay(1000); 
  }
  if ((distanceleft > 15 && distancefront <= 15 && distanceright <= 15) || (distanceleft > 15 && distancefront > 15 && distanceright <= 15) ||  (distanceleft > 15 && distancefront <= 15 && distanceright > 15) )
  {
    motor1.run(RELEASE);         
    motor2.run(RELEASE);
    delay(1000);
    motor1.run(BACKWARD);         
    motor2.run(FORWARD);        
    delay(1000);
  } 
}
2

Do you really want to turn the board on and off, or simply disable the code from running?

3

I guess the easier option is to disable the code. But, do you need an eletrical configuration like wiring to make the board on/off?

4

Yes, to remove power from the board, you’d have to figure out some hardware,

Enabling or Disabling the code is quite straightforward.

Add your switch or button, (optionally a global variable)…
Toggle (that variable) with) the switch, and depending on the state execute your code within loop() or not.

5

As always, the question is why?

You are yet to explain this.

6

After reading the hyperlink, here's my answer:
My original plan was to have power button like appliances. But then [lastchancename] asked me if it's to turn on/off the board or disable the program. Since I have little experience in electrical wiring, I will go with disabling the program. Therefore, the button will stop the ultrasonic sensors and motors ' program and when pressed again the program will run until the button is pressed again. I hope this answers your question and makes sense

8

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