안녕하세요. 너무 모르는것이 많습니다. 검색을 아무리해도 찾아 볼수없어서...문의드립니다.

아두이노+ LCD + 2 Push buttons 에서 구현한것을

NODEMCU에서는 핀D2를 LCD도 써야 하고, 버튼도 써야해서 arduino uno에서 2, 3에 연결했던 것을

nodeMCU에서는 , GPIO12 = D6, GPIO13 = D7 로 연결 했습니다.

업로드하고, 작동은 되는데 LCD에 숫자가 CLEAR하지 않게 표시됩니다.  

코드는 아래와 같습니다.

//Compatible with the Arduino IDE 1.0

//Library version:1.1

#include <Wire.h>

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd = LiquidCrystal_I2C(0x27, 20, 4);  // set the LCD address to 0x27 for a 20 chars and 4 line display

// this constant won't change:

const int  Down_buttonPin = 12;    // the pin that the pushbutton is attached to  GPIO12 = D6

const int  Up_buttonPin = 13;        // the pin that the pushbutton is attached to  GPIO13 = D7

// Variables will change:

int buttonPushCounter = 0;   // counter for the number of button presses

int up_buttonState = 0;         // current state of the up button

int up_lastButtonState = 0; // previous state of the up button

bool aPress = true; 

int down_buttonState = 0;         // current state of the up button

int down_lastButtonState = 0;     // previous state of the up button

bool bPress = false;

void setup()

{

  Serial.begin(9600);

  Wire.begin();

  // Wire.begin(SDA, SCL);            // NODEMCU/ESP default ist D2 = 4 = SDA ; D1 = 5 = SCL

  //Wire.begin(4, 5);              // NODEMCU geht

  //Wire.begin(D5, D6);           

  pinMode( Up_buttonPin , INPUT_PULLUP);

  pinMode( Down_buttonPin , INPUT_PULLUP);

  lcd.begin(); 

 //   lcd.init();                      // initialize the lcd

  // Print a message to the LCD.

  lcd.backlight();

 // lcd.noBacklight();

  lcd.setCursor(0,0);

  lcd.print("Please Select:");

  lcd.setCursor(2,1);

  lcd.print(buttonPushCounter);

}

void loop()

{

   checkUp();

   checkDown();

   if( bPress){

       bPress = false;

      lcd.setCursor(2,1);

      lcd.print("               ");

      lcd.setCursor(2,1);

      lcd.print(buttonPushCounter);

   }

   else{

    aPress = true;

    lcd.setCursor(2,1);

    lcd.print("               ");

    lcd.setCursor(2,1);

    lcd.print(buttonPushCounter);

   }

}

void checkUp()

{

  up_buttonState = digitalRead(Up_buttonPin);

 // compare the buttonState to its previous state

  if (up_buttonState != up_lastButtonState) {

    // if the state has changed, increment the counter

    if (up_buttonState == LOW) {

        bPress = true;

      // if the current state is HIGH then the button went from off to on:

      buttonPushCounter++;

      Serial.println("on");

      Serial.print("number of button pushes: ");

      Serial.println(buttonPushCounter);

    } else {

      // if the current state is LOW then the button went from on to off:

      Serial.println("off");

    }

    // Delay a little bit to avoid bouncing

    delay(50);

  }

  // save the current state as the last state, for next time through the loop

  up_lastButtonState = up_buttonState;

}

void checkDown()

{

  down_buttonState = digitalRead(Down_buttonPin);

  // compare the buttonState to its previous state

  if (down_buttonState != down_lastButtonState) {

    // if the state has changed, increment the counter

    if (down_buttonState == LOW) {

       bPress = true;

      // if the current state is HIGH then the button went from off to on:

      buttonPushCounter--;

      Serial.println("on");

      Serial.print("number of button pushes: ");

      Serial.println(buttonPushCounter);

    } else {

      // if the current state is LOW then the button went from on to off:

      Serial.println("off");

    }

    // Delay a little bit to avoid bouncing

    delay(50);

  }

  // save the current state as the last state, for next time through the loop

  down_lastButtonState = down_buttonState;

}