arduino on / off NON momentary switch implementation assistance-CodePudding

I am new to programming and Arduino. Board - ESP8266 Nodemcu pinout as below,

What I am trying to achieve is send a command based LOW/HIGH value from pin 0. A two leg switch's one leg is connected to D3 (GPIO0 and in program 0) and other to ground.

The code I am trying is below,

#include<BitsAndDroidsFlightConnector.h>

BitsAndDroidsFlightConnector connector = BitsAndDroidsFlightConnector();

const byte exampleButtonA = 0;

void setup() {
  Serial.begin(115200);
  pinMode(exampleButtonA, INPUT_PULLUP);
}

void loop() {
   byte exampleButtonAvalue = digitalRead(exampleButtonA);   
   switch(exampleButtonAvalue)
    {
      case LOW:
        Serial.println("ON IT IS");
        break;
      case HIGH:
        Serial.println("OFF IT IS");
        break;
      default:
        Serial.println("error!");
        break;
    } 
}

Issue I am facing is, when I flash this program, Based on physical switch on or off It continually prints either "ON IT IS" or "OFF IT IS" The break is really not happening. I only want it to execute once.

I also tried this with if else and face same problem of repeated printing.

#include<BitsAndDroidsFlightConnector.h>

BitsAndDroidsFlightConnector connector = BitsAndDroidsFlightConnector();

const byte exampleButtonA = 0;

void setup() {
  Serial.begin(115200);
  pinMode(exampleButtonA, INPUT_PULLUP);
}

void loop() {
   if(digitalRead(exampleButtonA) == LOW){
    Serial.println("ON");
    delay(200);
   }
  else {
   Serial.println("OFF");   
   delay(200);
  } 
}

Any assistance?

CodePudding user response：

If you want to see message only once you need to write youre code in setup() section. All code in loop() section is repeated in loop.

Replace you code with this:

#include<BitsAndDroidsFlightConnector.h>

BitsAndDroidsFlightConnector connector = BitsAndDroidsFlightConnector();

const byte exampleButtonA = 0;
int exampleButtonAvalue = 0;
int saved_exampleButtonAvalue = 0;

void setup() {
  Serial.begin(115200);
  pinMode(exampleButtonA, INPUT_PULLUP);

}

void loop() {
    exampleButtonAvalue = digitalRead(exampleButtonA); 

    if (exampleButtonAvalue != saved_exampleButtonAvalue){
        if(exampleButtonAvalue == LOW){
            Serial.println("ON");
        } else {
            Serial.println("OFF");   
        }
        saved_exampleButtonAvalue = exampleButtonAvalue;
    }

    delay(200);
}