#include <LiquidCrystal_I2C.h>
#include <Wire.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);

#define ENCODER_CLK 2
#define ENCODER_DT  3
int count = 0;
String IC2_ShowText = "count=";

void setup() {
  Serial.begin(115200);
  pinMode(ENCODER_CLK, INPUT);
  pinMode(ENCODER_DT, INPUT);
  pinMode(ENCODER_DT, INPUT_PULLUP);
  lcd.init();
  lcd.setCursor(0, 0);  //設定第1行
  lcd.print("[B10917008]");  //顯示文字
}

int lastClk = HIGH;
int lastSwitch = HIGH;
int newSwitch = digitalRead(4);

void loop()
{
  int newClk = digitalRead(ENCODER_CLK);
  if (newClk != lastClk) {
    // There was a change on the CLK pin
    lastClk = newClk;
    int dtValue = digitalRead(ENCODER_DT);
    if (newClk == LOW && dtValue == HIGH) {
      count++;
      Serial.print("count=");
      Serial.println(count);
        lcd.setCursor(0, 1);  //設定第2行
        lcd.print(IC2_ShowText + count);  //顯示文字
    }
    if (newClk == LOW && dtValue == LOW) {
      count--;
      Serial.print("count=");
      Serial.println(count);
        lcd.setCursor(0, 1);  //設定第2行
        lcd.print(IC2_ShowText + count);  //顯示文字
    }
  }
  if(newSwitch != lastSwitch){
    lastSwitch = newSwitch;
    count = 0;
    if(newSwitch == 1){
      Serial.print("reset=");
      Serial.println(count);
        lcd.setCursor(0, 1);  //設定第2行
        lcd.print("reset=" + count);  //顯示文字
    }
  }
}