#include <DHT.h>
#include <LiquidCrystal_I2C.h>
#define DHTPIN 2
#define DHTTYPE DHT22

DHT dht(DHTPIN, DHTTYPE);

LiquidCrystal_I2C lcd(0x27, 16, 2); //

int trigPin = 11;
int echoPin = 12;
int buzzerPin = 8;
int coldWaterPin = 13;
int warmWaterPin = 9;

void setup() {
  lcd.init(); // Initialize the LCD
  lcd.backlight(); // light up
  lcd.setCursor(0, 1);
  lcd.print("Body Health");
  lcd.print("Monitoring System");

  delay(2000);

  pinMode(trigPin, OUTPUT); //测距
  pinMode(echoPin, INPUT);
  pinMode(buzzerPin, OUTPUT); //蜂鸣器输出模式
  pinMode(coldWaterPin, OUTPUT);
  pinMode(warmWaterPin, OUTPUT);

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Body Temp:");
  lcd.setCursor(0, 1);
  lcd.print("Sweating:"); //出汗情况
}

void loop() {
  float h = dht.readHumidity(); //读取湿度值
  float t = dht.readTemperature(); //温度-摄氏度
  float f = dht.readTemperature(true); //华氏度

  if (isnan(h) || isnan(t) || isnan(f)) {
    lcd.setCursor(0, 1);
    lcd.print("Sensor error");
    return;
  } //如果传感器读数异常，报错

  lcd.setCursor(10, 0); //LCD光标位置
  lcd.print(t, 1); //体温保留1小数
  lcd.write(0xDF); //摄氏度符号
  lcd.print("C");

  long duration, distance; //超声波测距的2变量
  digitalWrite(trigPin, LOW); //初始值
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = duration / 58.2;

  lcd.setCursor(10, 1);
  lcd.print(distance);
  lcd.print("cm");

  if (distance > 10) {
    lcd.setCursor(0, 1);
    lcd.print("No sweating ");
    digitalWrite(buzzerPin, LOW);
  } else {
    lcd.setCursor(0, 1);
    lcd.print("Sweating ");
    digitalWrite(buzzerPin, HIGH);
    delay(500);
    digitalWrite(buzzerPin, LOW);
  }

  if (t < 35) {
    lcd.setCursor(0, 0);
    lcd.print("Temp is low");
  } else if (t > 38) {
    lcd.setCursor(0, 0);
    lcd.print("Temp is high");
  } else {
    if (distance < 10) {
      digitalWrite(coldWaterPin, HIGH); // 冷水开
      delay(10000);
      digitalWrite(coldWaterPin, LOW); // 冷水关
    } else if (distance < 20) {
      digitalWrite(warmWaterPin, HIGH); // 热水开
      delay(10000);
      digitalWrite(warmWaterPin, LOW); // 热水关
    }
  }
}