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  • Sep 23 20:22
    Makuna closed #120
  • Sep 23 20:22
    Makuna updated the wiki
  • Sep 23 20:13
    Makuna updated the wiki
  • Sep 23 08:34
    T0m92 opened #120
  • Aug 27 15:58
    Makuna closed #119
  • Aug 27 15:58
    Makuna labeled #119
  • Aug 27 15:55
    Makuna closed #118
  • Aug 27 08:15
    Bredahl opened #119
  • Aug 03 15:39
    Flavian opened #118
  • Aug 01 19:24
    Makuna closed #117
  • Aug 01 17:19
    lucagrosshennig opened #117
  • Jul 31 17:46
    thijstriemstra opened #116
  • Jul 25 23:30

    Makuna on 2.3.5

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  • Jul 25 23:28

    Makuna on NextRelease

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  • Jul 25 23:28

    Makuna on master

    increment version (#115) (compare)

  • Jul 25 23:28
    Makuna closed #115
  • Jul 25 23:28
    Makuna opened #115
  • Jul 25 23:28

    Makuna on NextRelease

    increment version (compare)

  • Jul 25 23:25
    Makuna closed #37
  • Jun 26 18:54
    Makuna labeled #110
Boris van Galvin
@vangalvin
I do have to however ask, how do you get just the EPOCH time? I was looking at using this to timestamp sensors.
Michael Miller
@Makuna
@vangalvin once you have the RtcDateTime, just call Epoch32Time() or Epoch64Time() on that object to get what you want.
Its listed here in the wiki
Boris van Galvin
@vangalvin
Awesome, Yep got that thanks :) works a treat!
Just as a heads up the unit is heading down to Antartica to be installed on the side of Mt Erebus and will be collecting temperature data. there are about 60+ temperature sensors per node.
Michael Miller
@Makuna
Is there a public web site on your project? I like to add links to the wiki to projects people do with my libraries.
Boris van Galvin
@vangalvin
Sadly not as yet. I may end up making one at some stage however due to time constraints and I am having issues finding the time to get all the electronics built, design and machine the housing and get the programming done. lol. 8AM starts and its justgone 3AM and im still up working. Man i wish the hours were billable :P
Bashar3
@Bashar3
Hi I'm having trouble with showing the right time using the method "RtcDateTime now = rtcModule.GetDateTime();" it's showing wrong hour and wrong minute. I'm using Arduino Uno.I'm trying to print the time to an oled display. my method updateTime() looks like this:

void updateTime(){

oldMinute = minutes;
RtcDateTime now = rtcModule.GetDateTime();

hours = now.Hour();
minutes = now.Minute();
seconds = now.Second();

Bashar3
@Bashar3
the sketch I'm building exists in this code in GitHub also https://github.com/kjellcompany/Arduino_701/blob/master/GrandFinale/GrandFinale.ino
Michael Miller
@Makuna
@Bashar3 Are you sure that you set the date and time on the module?
While I saw nothing obviously wrong with your code; I would suggest that you look at the examples I provide and add at least a little of the checking code; like making sure the RTC is even running and that the datetime and is valid.
Bashar3
@Bashar3
@Makuna I'll take a look at it, appreciate your answer.
Mehrdad
@mehrdad987
hi Mr miller
are there any ways to change my time in ds3231 from the internet?
I set the time from my computer and also I can see there are a possibility to change time with NTP but I wanna change it from my own server
Michael Miller
@Makuna
@mehrdad987 I don't know exactly what you are asking, as all you have to do is construct a RtcDateTime object and set the date and time from the many ways it supports. The source of the date and time is irrelevant as you just need to use a method that works best.
See https://github.com/Makuna/Rtc/wiki/RtcDateTime-object#constructors for the constructors, and you also have epoch time init methods https://github.com/Makuna/Rtc/wiki/RtcDateTime-object#void-initwithepoch32timeuint32_t-time
Mehrdad
@mehrdad987
@Makuna
Sorry I didn't notice
Thank you, Mr Miller now I can change the ds3231 time through my server
raza505050
@raza505050
hello there! i wants to get millisecond in return as a timestamp using RTC DS3231, can anyone help me how can i solve this issue?
raza505050
@raza505050
anyone?
Michael Miller
@Makuna
Did you read the Spec sheet? The DS3231 doesn't track time down to milliseconds. I am not sure there is an RTC modules that does.
The only way I could think of doing it is to use the SQW pin to trigger a one second timed pulse, then attach an interrupt to it, and in the ISR capture the uCs millis()/cyclecount. And then when ever you get the time, just compare the current millis() to that captured value to get the milliseconds since the last second.
Marco
@marcolino7
Hi, I would like to put all rtc code into external .cpp and .h file and use in main.cpp only the created object Rtc. Is there any example on how achieve this?
Michael Miller
@Makuna
Why do you want to do that?
No, there are no examples of this. Basically, you would have to wrap it in your own class, as the library is not written to be a binary distributed library, as that would bloat the code. The code is written using templates.
Marco
@marcolino7
@Makuna thanks for clarification. I'm writing a firmware that have a lot of code, so I prefer to split function in more files. This is the main reason.
Michael Miller
@Makuna
@marcolino7 My suggestion would be to then follow a design pattern that you abstract what you need the RTC to accomplish within your code behind an API (.h/.cpp) and then in that code include and instance the RTC object. It should accomplish your goals.
Sterminatore
@Sterminare
Hello, I'm looking for some help. Im a bit of a beginner. I am making a clock with three voltmeters, one for hour, minute, and second. I need to take the hour, minute, and seconds value, and convert it to a value between 0-255 so I can analogWrite it to each voltmeter. Basically I just need to know how I can have a variable equal to the hours, another equal to the minutes, another equal to seconds value and I can do the rest. Thanks
Michael Miller
@Makuna
Just use the accessors methods on the RtcDateTime object.
See wiki pages here
Sterminatore
@Sterminare
Im sorry i don't really understand the terminology well, am I supposed to write 'uint8_t' or is that a placeholder for something else?
Sterminatore
@Sterminare
analogWrite(secondsPin, (RtcDateTime.Second() / 60) * 255);
doesnt work
Michael Miller
@Makuna
@Sterminare do you know what a uint8_t is? How about byte? Search for these terms and you will learn them.
When you say it doesn't work, how does it not work? What did you do to investigate how it doesn't work? My first suggestion is take your little math routine and print out in debug the results. I think you will you find you get either a zero or 255, nothing else. You need to understand how C/C++ handles integer math types. What is 59/60 calculate out to be when doing integer math? Answer this and you will understand whats wrong.
Sterminatore
@Sterminare
So I need to figure out how to make sure it doesnt round, that
is something I can figure out, but is it right that RtcDateTime.Second() is the value of how many seconds have passed since the last minute? etc for RtcDateTime.Minute() since last hour and RtcDateTime.Hour() since midnight?
Sterminatore
@Sterminare
What I put above does not compile, it says 'primary expression expected before ".". I tried changing it to RtcDateTime().Second() but that doesnt seem right and unsurprisingly trying to print this to serial it is just blank (I assume undefined).
I've gotten it figured out. I was able to declare global seconds, minutes, hours variables and then in the printDateTime() function, after printing it to serial I have it seconds=dt.Second(); minutes=dt.Minute(); hours=dt.Hour();
Jay
@jay-ramani

Hi Michael, I'm working on a DS1302 based RTC on an Arduino Uno R3, and trying to reduce global storage while I'm already pressed for RAM with other global variables I cannot do away with. I'm not well versed in C++ (though I have worked on C), and having trouble doing away with a dedicated ThreeWire object with the statements below

ThreeWire interface_three_wire(PIN_ARDUINO_RTC_IO, PIN_ARDUINO_RTC_SCLK, PIN_ARDUINO_RTC_CE);

RtcDS1302<ThreeWire> Rtc(interface_three_wire);

to

RtcDS1302<ThreeWire> Rtc(ThreeWire(PIN_ARDUINO_RTC_IO, PIN_ARDUINO_RTC_SCLK, PIN_ARDUINO_RTC_CE));

With passing an object like this, I'm getting this error:

RTC_DS1302:373:29: error: cannot bind non-const lvalue reference of type 'ThreeWire&' to an rvalue of type 'ThreeWire'

Would be great if you could help. Thanks.

Michael Miller
@Makuna
C++ is not C# (or Java/Python/etc), objects DO NOT have reference counts or lifetimes based on held references.
The issue is that the argument is defined to be a "reference" to the object. The compiler is catching that you are passing a temporary object. After the construction of the RtcDS1302, the object you pass will no longer exist and the rtc object would have had an invalid reference.
Michael Miller
@Makuna
Due to how Arduino defines most wire as a global object rather than let the user create it, the interface of the Rtc libraries requires the passing of the reference.
VoicelessProximity1701
@VoicelessProximity1701
Hi
I am having a problem with my DS3231 module, in that it keeps on saying etc not declared in this scope
Here is the code I am using

include <RTClib.h>

include <SD.h>

include <SPI.h>

include <DS3231.h>

File myFile;
int pinCS = 53; // Pin 10 on Arduino Uno
void setup() {

Serial.begin(9600);
pinMode(pinCS, OUTPUT);

// SD Card Initialization
if (SD.begin())
{
Serial.println("SD card is ready to use.");
} else
{
Serial.println("SD card initialization failed");
return;
}
rtc.begin();
}
void loop() {
Serial.print(rtc.getTimeStr());
Serial.print(",");
Serial.println(int(rtc.getTemp()));

myFile = SD.open("test.txt", FILE_WRITE);
if (myFile) {
myFile.print(rtc.getTimeStr());
myFile.print(",");
myFile.println(int(rtc.getTemp()));
myFile.close(); // close the file
}
// if the file didn't open, print an error:
else {
Serial.println("error opening test.txt");
}
delay(3000);

I am using an Arduino/Elegoo Mega 2560
Michael Miller
@Makuna
@VoicelessProximity1701 Your sketch has many issues and does not match my library in the calls you are using. Please review the samples included with the library and you will should discover all the issues I spot.
VoicelessProximity1701
@VoicelessProximity1701
Ok thanks 👍
Luca Grosshennig
@lucagrosshennig
Hey I have a question. I have to use the DS3231 in parallel with an other i2c sensor. But I dont know where to specify the i2c address of the rtc. Can you help me?.
Ps: Sorry for the bad language
Michael Miller
@Makuna
@lucagrosshennig You don't need to supply the i2c address as the DS3231 only supports one address and the library defines this internally. While some i2c devices support more than one address, the DS3231 does not.
Does your device support more than one? What addresses does it support?
Luca Grosshennig
@lucagrosshennig
@Makuna I want to use the DS3231 in parallel with a BME280 over the same i2c pins. Seperatly they work properly but when I try to use both of them the sensor outputs are nuts.
Michael Miller
@Makuna
What address are you using for the BME280? The DS3231 is 0x68(hex).
Michael Miller
@Makuna
The spec sheet states the BME280 is 0x60, so no overlap there. What library are you using to read data for it?
And what platform? You can't access the same I2C bus with different threads (tasks) without using some blocking mechanism on top of the APIs.
Ivan Maltarić
@jasamico_twitter
Hi, I'm using your library with my DS1302. It's about 30 late but thats not a big deal, minutes and hours are the important thing I should watch for. Although I managed to print time in a nice format using Serial.print after every measurement (I'm building a WeatherStation), I also want to use MicroSD card adapter which I had successfully booted and connected and measurements are being written normally onto the txt file I created. Now the problem starts with printing formatted Date and Time onto the SD card. I tried everything and every one of yours functions but the furthest I got was the 9 digit number which I suppose "is" the date and time only formatted to total number of days since the met and agreed Arduino starting time or how should I call it.

include <SoftwareSerial.h>

include <SD.h>

include <SPI.h>

include <ThreeWire.h>

include <RtcDS1302.h>

ThreeWire myWire(4, 5, 2); // IO, SCLK, CE
RtcDS1302<ThreeWire> Rtc(myWire);

float temp, hum, pres;
int i = 0;
byte buff[4];
File myFile;

void setup()
{

Serial.begin(115200);
Serial.println("Starting...");
Serial.print("Initializing SD card...");
delay(3000);
if (!SD.begin (15, SD_SCK_MHZ(1))) {
Serial.println("initialization failed!");
return;
}
Serial.println("initialization done.");
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() {
RtcDateTime now = Rtc.GetDateTime();

if (Serial.available() > 0) {

byte b0 = Serial.read();
delay(10);
byte b1 = Serial.read();
delay(10);
byte b2 = Serial.read();
delay(10);
byte b3 = Serial.read();
delay(10);
//Serial.println(b0, HEX);
//Serial.println(b1, HEX);
//Serial.println(b2, HEX);
//Serial.println(b3, HEX);
buff[0] = b0;
buff[1] = b1;
buff[2] = b2;
buff[3] = b3;
float *fp = (float*) buff;

switch (i) {
  case 0:
    temp = *fp;
    Serial.print("Temp je ");
    Serial.println(temp);
    printDateTime(now);
    Serial.println();
    myFile = SD.open("test.txt", FILE_WRITE);
    myFile.println(temp);
    myFile.println(RtcDateTime(now));
    myFile.close();
    break;
  case 1:
    hum = *fp;
    Serial.print("hum je ");
    Serial.println(hum);
    printDateTime(now);
    Serial.println();
    myFile = SD.open("test.txt", FILE_WRITE);
    myFile.println(hum);
    myFile.close();
    break;
  case 2:
    pres = *fp;
    Serial.print("tlak je ");
    Serial.println(pres);
    printDateTime(now);
    Serial.println();
    myFile = SD.open("test.txt", FILE_WRITE);
    myFile.println(pres);
    myFile.close();
    break;
  default:
    temp = *fp;
    Serial.print("Temp je ");
    Serial.println(temp);
    printDateTime(now);
    Serial.println();
    myFile = SD.open("test.txt", FILE_WRITE);
    myFile.println(temp);
    myFile.close();
    i = 0;
    break;

}
i++;

}

}

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.Day(),
dt.Month(),
dt.Year(),
dt.Hour(),
dt.Minute(),
dt.Second() );
Serial.print(datestring);
}