计算秒数不起作用

Question

好吧，所以我写了这段代码，据我所知，它应该输出 HMS 时间，但它只输出 00:00:00 比一秒长得多。我没有尝试等待超过几个小时来查看它是否发生变化。我知道这不是硬件问题，因为我的液晶显示屏工作正常并且我没有任何其他东西连接到我的arduino。如果你想知道，我尝试过将“_time”函数“over”循环。

这是代码:

#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

int hour;
int minute;
int seconds = -1;
boolean printed = false;
boolean secCounted = false;
unsigned long nextMillis = 1000;

void setup() {
  lcd.begin(16, 2);
}

 void loop() {
  unsigned long currentMillis = millis();
  if(currentMillis = nextMillis) _time(), nextMillis += 1000;
 }

void _time(){

                                    seconds += 1;
  if(seconds == 60)                 seconds = 0, minute += 1;
  if(minute == 60 && hour <= 12)    minute = 0, hour += 1; 

  if(printed == false){
  if(hour == 0)                     lcd.print("00");
  if(hour != 0 && hour < 10)       {lcd.print("0");
                                    lcd.print(hour);}
  if(hour > 9)                      lcd.print(hour);
                                    lcd.print(":"); 
  if(minute == 0)                   lcd.print("00");
  if(minute != 0 && minute < 10)   {lcd.print("0");
                                    lcd.print(minute);}
  if(minute > 9)                    lcd.print(minute);
                                    lcd.print(":");
  if(seconds == 0)                  lcd.print("00");
  if(seconds != 0 && seconds < 10) {lcd.print("0");
                                    lcd.print(seconds);}
  if(seconds > 9)                   lcd.print(seconds);
  printed = true;
  }
}

Answer 1

改变

if(currentMillis = nextMillis) // here is nextMillis is assigned to currentMillis 

上

 if(currentMillis == nextMillis) // here is nextMillis is compared with currentMillis on equality