RTC 1302 + TM1637 Numbers or screen inverted problem

[BullzLabz]

Hello,

Firstly, thank you for this useful library.

I'm new to Arduino code, and I tried to do some research to solve my problem but I couldn't.

My problem is that the characters/numbers randomly show upside down on my TM1637 display. Sometimes it also happens that some numbers are not displayed at all but it is also very random.

Did I make a mistake somewhere, did I reverse something?

Maybe you could help me please.

This is my simple code:

#include <TM1637.h>

#include <ThreeWire.h>  
#include <RtcDS1302.h>

TM1637 TMONE(4,5);

ThreeWire myWire(A2,A1,A3); // IO, SCLK, CE
RtcDS1302<ThreeWire> Rtc(myWire);

void setup() {
  
  TMONE.init();
  TMONE.setBrightness(0x0f);
  
  Serial.begin(57600);
  
  Serial.print("compiled: ");
  Serial.print(__DATE__);
  Serial.println(__TIME__);
  
  Rtc.Begin();
  RtcDateTime compiled = RtcDateTime(__DATE__, __TIME__);
  printDateTime(compiled);
  
  Serial.println();
  
  if (!Rtc.IsDateTimeValid()) {
    // Common Causes:
    //    1) first time you ran and the device wasn't running yet
    //    2) the battery on the device is low or even missing
    
    Serial.println("RTC lost confidence in the DateTime!");
    Rtc.SetDateTime(compiled);
  }
  
  if (Rtc.GetIsWriteProtected()) {
    Serial.println("RTC was write protected, enabling writing now");
    Rtc.SetIsWriteProtected(false);
  }
  
  if (!Rtc.GetIsRunning()) {
    Serial.println("RTC was not actively running, starting now");
    Rtc.SetIsRunning(true);
  }
  
  RtcDateTime now = Rtc.GetDateTime();
  
  if (now < compiled) {
    Serial.println("RTC is older than compile time!  (Updating DateTime)");
    Rtc.SetDateTime(compiled);
  }
  
  else if (now > compiled) {
    Serial.println("RTC is newer than compile time. (this is expected)");
  }
  
  else if (now == compiled) {
    Serial.println("RTC is the same as compile time! (not expected but all is fine)");
  }
}

void loop() {
  
  TMONE.switchColon();
  
  RtcDateTime now = Rtc.GetDateTime();
  
  String Timestr = printDateTime(now);
  
  Serial.println();
  
  if (!now.IsValid()) {
    // Common Causes:
    //    1) the battery on the device is low or even missing and the power line was disconnected
    
    Serial.println("RTC lost confidence in the DateTime!");
  }
  
  int c0 = Timestr[15]-48;
  int c1 = Timestr[14]-48;
  int c2 = Timestr[12]-48;
  int c3 = Timestr[11]-48;
  
  TMONE.display(c3, false, false, 3);
  TMONE.display(c2, false, false, 2);
  TMONE.display(c1, false, false, 1);
  TMONE.display(c0, false, false, 0);

  delay(1000); // one seconds
}

#define countof(a) (sizeof(a) / sizeof(a[0]))

void printDateTime(const RtcDateTime& dt) {
  char datestring[20];
  
  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);
  return (datestring);
}

[BullzLabz]

This is an example

[Makuna]

This has nothing to do with RTC Library. To me it looks like the hardware is connected and working, its your sketch that is the issue.

HINT: Your display is upside down; periods go at the bottom.

[BullzLabz]

Did you look at the picture? 😀

If I turn the screen, it displays 63h 10min! It seems unlikely to me lol

[Makuna]

Did you look at the picture? 😀

If I turn the screen, it displays 63h 10min! It seems unlikely to me lol

Obviously, you didn't look closely at your own picture, the display is upside down.
And the numbers now read 6310, did you look at this closely, it should be what? 0136. If you can't take it from here, then maybe you should get a nights sleep.

[BullzLabz]

Ok thanks for "your help", I'll try to fix that with others library !