Not able to set time and get updated time in RTC- DS32321

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1

I am new to coding and Arduino.

I am trying to display time from RTC DS32321 on TM1637Display using ATtiny85.

I am facing two issues.

  1. I am not able to set time to RTC using below code (referred API : DS3231/Time-Set.md at master · NorthernWidget/DS3231 · GitHub ) .

#include <TM1637Display.h>
#include <TinyWireM.h>
#include <DS3231.h>

#define CLK 1
#define DIO 3

DS3231 rtc;
TM1637Display display = TM1637Display(CLK, DIO);

bool h12Flag;
bool pmFlag;

void setup() {

 Wire.begin();

// Begin serial communication
Serial.begin(9600);
// Set the display brightness (0-7)
display.setBrightness(7);

byte h = 21;
byte m = 28;
rtc.setHour(h);
rtc.setMinute(m);

}

void loop() {
// put your main code here, to run repeatedly: //

int displayTime= rtc.getHour(h12Flag,pmFlag)+rtc.getMinute();
 Serial.println(displayTime);
 display.showNumberDecEx(displayTime,0b11100000,true);

}

  1. When I disconnect the power from ATtiny85 to check if RTC is working when mains power drops RTC should update the Time ( coin-cell shows voltage as a back-up) but RTC doesn't show correct time after getting the Mains power. It starts again from where it left off.
2

Which DS3231 RTC module are you using?
Which TM1637 module are you using?
How have you connected them to the TINY85?

3

If the RTC oscillator turns off when you switch off Vcc power, even though the coin cell is present, it probably means the /EOSC bit in the Control register is set. I believe that bit is cleared if you completely power down the RTC, including removing the coin cell, then power up again. At least that's what the datasheet says.

4

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