How to use "lcd.print( );" for single time item in DS1302 library ?

[mianqi2016]

I tested the RTC library for DS1302, the code "Serial.print(datestring);" show time correctly in serial monitor, while "lcd.print(dt.Second());" show seconds in this way:
59-09-19-29-39-49-59-69-79-89-99-10-11-12-...59..., and when there is a minute ypdate, it would show "12:3:009-...999".

My code was:

void printDateTime(const RtcDateTime& dt)
{
char datestring[26];

snprintf_P(datestring,
        countof(datestring),
        PSTR("%02u/%02u/%04u %02u:%02u:%02u"),
        dt.Month(),
        dt.Day(),
        dt.Year(),
        dt.Hour(),
        dt.Minute(),
        dt.Second() );
//Serial.print(datestring);

lcd.setCursor(6, 0);
lcd.print(dt.Hour());
lcd.print(':');
lcd.print(dt.Minute());
lcd.print(':');
lcd.print(dt.Second());

if(dt.Day()>=10 && dt.Month()>=10) {
    lcd.setCursor(6, 3);
  } else if(dt.Day()<10 || dt.Month()<10) {
    lcd.setCursor(7, 3);
  } else {    // tm.Day<10 and tm.Month>=10 or otherwise
    lcd.setCursor(7, 3);
  }

lcd.print("Mon:");
lcd.print(dt.Month());
lcd.print('.');
lcd.print(dt.Day());
lcd.print('.');
lcd.print(dt.Year());

}

is there any method for this library used on LCD screen?

[Makuna]

This library doesn't do any string formatting for printing. The examples just include one way of how to do it using snprintf_P to format a string that then is printed using String.

Just replace the Serial.print(datestring); with lcd.print(datestring); and it should work the same. Then just become familiar with snprintf_P (snprintf, sprintf, printf) and the formatting string.

[mianqi2016]

Since LiquidCrystal library has no "printf" method, I used a convertor function from Micheal Margolis's library "DS1307RTC": void print2digits(int number) { if (number >= 0 && number < 10) { lcd.print('0'); } lcd.print(number); } and, I changed the code from: lcd.setCursor(6, 0); lcd.print(dt.Hour()); lcd.print(':'); lcd.print(dt.Minute()); lcd.print(':'); lcd.print(dt.Second()); into: lcd.setCursor(6, 0); print2digits(dt.Hour()); lcd.print(':'); print2digits(dt.Minute()); lcd.print(':'); print2digits(dt.Second()); then, it was OK.

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________________________________ 发件人: Michael Miller ***@***.***> 发送时间: 2025年2月27日 0:55 收件人: Makuna/Rtc ***@***.***> 抄送: Mian Qi ***@***.***>; Author ***@***.***> 主题: Re: [Makuna/Rtc] How to use "lcd.print( );" for single time item in DS1302 library ? (Discussion #222) This library doesn't do any string formatting for printing. The examples just include one way of how to do it using snprintf_P to format a string that then is printed using String. Just replace the Serial.print(datestring); with lcd.print(datestring); and it should work the same. Then just become familiar with snprintf_P (snprintf, sprintf, printf) and the formatting string. ― Reply to this email directly, view it on GitHub<#222 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AFPCOAUFGCI7FSGUQGQPKL32RZO7HAVCNFSM6AAAAABX6QTKU2VHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTEMZTGI3DGNA>. You are receiving this because you authored the thread.Message ID: ***@***.***>