#include <LiquidCrystal_I2C.h>
#include <Keypad.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
const uint8_t ROWS = 4;
const uint8_t COLS = 3;
char keys[ROWS][COLS] = {
  { '1', '2', '3' },
  { '4', '5', '6' },
  { '7', '8', '9' },
  { '*', '0', '#' }
};
uint8_t colPins[COLS] = { 6, 7, 8 };
uint8_t rowPins[ROWS] = { 2, 3, 4, 5 };
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
String data = "";
int sw1 = 0;
int datasp = 0;
void setup() {
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("SP:  0 | PV:  0 ");
  lcd.setCursor(0, 1);
  lcd.print("State:0         ");
  delay(1000);
  pinMode(A0, INPUT_PULLUP);
}
void loop() {
  int sw = !digitalRead(A0);
  if (sw != sw1) {
    sw1 = sw;
    Serial.print("a,");
    Serial.println(sw);
  }
  char key = keypad.getKey();
  if (key != NO_KEY) {
    if (key != '#') {
      if (key == '*') {
        lcd.setCursor(0, 0);
        lcd.print("SP:  0 ");
        data = "";
      } else {
        data = data + key;
        datasp = data.toInt();
        lcd.setCursor(3, 0);
        if (datasp < 10) lcd.print(" ");
        if (datasp < 100) lcd.print(" ");
        lcd.print(datasp);
      }
    }
    else {
      Serial.print("b,");
      Serial.println(datasp);
      datasp = "";
    }
  }
}
void serialEvent() {
  while (Serial.available()) {
    int datapv = Serial.parseInt();
    int datastate = Serial.parseInt();
    if (Serial.read() == char(13)) {
      lcd.setCursor(12, 0);
      if (datapv < 10) lcd.print(" ");
      if (datapv < 100) lcd.print(" ");
      lcd.print(datapv);
      lcd.setCursor(6, 1);
      if (datastate < 10) lcd.print("0");
      lcd.print(datastate);
    }
  }
}