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久坐提醒器

代码
#include <SoftI2CMaster.h>
#include <LiquidCrystal_SoftI2C.h>
#include <MsTimer2.h>

volatile float distance;

float checkdistance_8_7() {
  digitalWrite(8, LOW);
  delayMicroseconds(2);
  digitalWrite(8, HIGH);
  delayMicroseconds(10);
  digitalWrite(8, LOW);
  float distance = pulseIn(7, HIGH) / 58.00;
  delay(10);
  return distance;
}

LiquidCrystal_SoftI2C mylcd(0x20,16,2,A5,A4);
void msTimer2_func() {
  mylcd.clear();
  distance = checkdistance_8_7();
  delay(10);
  if (distance < 51) {
tone(0,131);
delay(10);
mylcd.setCursor(1-1, 1-1);
mylcd.print("您已久坐，");
mylcd.setCursor(1-1, 0-1);
mylcd.print("该运动一下啦！");
delay(300);

  }
}

void setup(){
  pinMode(8, OUTPUT);
  pinMode(7, INPUT);
  distance = checkdistance_8_7();
  mylcd.init();
  mylcd.backlight();
  mylcd.display();
  pinMode(0, OUTPUT);
}

void loop(){
  if (digitalRead(7) == HIGH) {
digitalWrite(8,HIGH);
MsTimer2::set(1800000, msTimer2_func);
MsTimer2::start();

  } else {
digitalWrite(8,LOW);

  }
  for (int time = 1; time <= 10; time = time + (1)) {
mylcd.clear();
distance = checkdistance_8_7();
delay(10);
if (distance < 51) {
   tone(0,131);
   delay(10);
   mylcd.setCursor(1-1, 1-1);
   mylcd.print("您已久坐，");
   mylcd.setCursor(1-1, 0-1);
   mylcd.print("该运动一下啦！");
   delay(300);

}
  }

}