How to use DS3231 RTC module to build OLED clock 

Glad you liked it

Glad you like it.

I get the same error on ESP32, this seems to be an error with a separate clock library. The compilation error "redeclared as different kind of symbol" typically occurs when you have conflicting declarations or naming issues in your code. In this case, it seems that you have a naming conflict with the symbol 'DS3231 clock'. Perhaps this is due to a separate clock library we have loaded. ...but if so which library is causing the problem?

this error happens because there are two different libraries with the same name, "DS3231", one by andrew wickert and the other one by Korneliusz Jarzebski. this last one is used in the present video. uninstall the other one. the author of the video seems to be unaware of this problem.

Paste the setup function from the code you are trying to load

@@marios_ideas Is this what you want? Also getting error: 'RTCDateTime' does not name a type; did you mean 'DateTime'? void setup() { Serial.begin(9600); Clock1.begin(); // Set sketch compiling time Clock1.setDateTime(__DATE__, __TIME__); // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64 Serial.println(F("SSD1306 allocation failed")); for (;;); // Don't proceed, loop forever } display.display(); // Display initial Adafruit logo delay(2000); // Clear the buffer display.clearDisplay(); display.display(); }

@@am1manTravel You said you loaded the code after you upgraded library and the clock does not work. But now you say you get compile error so you couldn't load the code with error in code. Also the library I was using in this code is an old library which is not further developed so where did you get the update. There are other libraries written by other people with the same name so maybe you installed different library

@@marios_ideas Well, I think I fixed the multiple DS3231 libraries and got the one you recommended, the latest version, in there. Still the same problem with the time.

Sorry for all the msgs. Think I fixed it with ChatGPT help. Uncomment the clock1.setDateTime(__DATE__, __TIME__); line. Upload the sketch to set the time to the current compilation time. Comment out the clock1.setDateTime(__DATE__, __TIME__); line again. Re-upload the sketch so it doesn't reset the time every time it powers on.

I fixed the time issue! still looking to change C to F.

This should be a simple formula to be applied to a variable storing celcius value . Temperature in degrees Celsius (°C) = (Temperature in degrees Fahrenheit (°F) - 32) * 5/9.

You're welcome:)

Yes you are right. In declaring the RTC you do not quote the address. So It must be done in the library code and that would indicate that DS3231 has fixed address as opposed to OLED displays which I thinkk have 2 or 3 potentialy different addresses.

@@marios_ideas Alright! I understand your explanation. Btw, I'm doing a project now. But I'm using an LCD instead of ng OLED display. The clock.dateFormat won't work whenever I want to print to the LCD or the serial monitor. I use these for trying to print: LCD: lcd.print(clock.dateFormat("H:i:s", dt)); Serial Monitor: Serial.println(clock.dateFormat("m.d.y|H:i:s", dt)); If you have any ideas about this, it will be very helpful! Thanks a lot!

Is it possible that it is the same memory problem that I descried for oled displays. So the rtc library plus liquid cristal library together consume too much memory. Try to remove from code lcd part and see if then serial.print works

Thanks:)

have you intealled the library?

@@marios_ideas Thank You for the answer ... Yes , the one you provide it , and I put it here : """ C:\Program Files (x86)\Arduino\libraries """ - could be / has to be installed in another place ? ... - it is possible to be in conflict with other libraries that already installed ? ... THANK You

oled_clock_using_ds3231_rtc_module_:11:8: error: no matching function for call to 'DS3231::DS3231()' DS3231 clock; ^~~~~ In file included from E:\Download_NOU_Mar_2020\New folder\oled_clock_using_ds3231_rtc_module_\oled_clock_using_ds3231_rtc_module_.ino:7:0: C:\Program Files (x86)\Arduino\libraries\DS3231/DS3231.h:80:3: note: candidate: DS3231::DS3231(uint8_t, uint8_t) DS3231(uint8_t data_pin, uint8_t sclk_pin); ^~~~~~ C:\Program Files (x86)\Arduino\libraries\DS3231/DS3231.h:80:3: note: candidate expects 2 arguments, 0 provided C:\Program Files (x86)\Arduino\libraries\DS3231/DS3231.h:77:7: note: candidate: constexpr DS3231::DS3231(const DS3231&) class DS3231 ^~~~~~ C:\Program Files (x86)\Arduino\libraries\DS3231/DS3231.h:77:7: note: candidate expects 1 argument, 0 provided C:\Program Files (x86)\Arduino\libraries\DS3231/DS3231.h:77:7: note: candidate: constexpr DS3231::DS3231(DS3231&&) C:\Program Files (x86)\Arduino\libraries\DS3231/DS3231.h:77:7: note: candidate expects 1 argument, 0 provided oled_clock_using_ds3231_rtc_module_:12:1: error: 'RTCDateTime' does not name a type RTCDateTime dt; ^~~~~~~~~~~ E:\Download_NOU_Mar_2020\New folder\oled_clock_using_ds3231_rtc_module_\oled_clock_using_ds3231_rtc_module_.ino: In function 'void setup()': oled_clock_using_ds3231_rtc_module_:24:11: error: 'class DS3231' has no member named 'setDateTime'; did you mean 'setTime'? clock.setDateTime(__DATE__, __TIME__); ^~~~~~~~~~~ setTime E:\Download_NOU_Mar_2020\New folder\oled_clock_using_ds3231_rtc_module_\oled_clock_using_ds3231_rtc_module_.ino: In function 'void loop()': oled_clock_using_ds3231_rtc_module_:42:3: error: 'dt' was not declared in this scope dt = clock.getDateTime(); ^~ oled_clock_using_ds3231_rtc_module_:42:14: error: 'class DS3231' has no member named 'getDateTime'; did you mean 'getTime'? dt = clock.getDateTime(); ^~~~~~~~~~~ getTime oled_clock_using_ds3231_rtc_module_:51:27: error: 'class DS3231' has no member named 'dateFormat' display.println(clock.dateFormat("l", dt)); ^~~~~~~~~~ oled_clock_using_ds3231_rtc_module_:56:25: error: 'class DS3231' has no member named 'dateFormat' display.println(clock.dateFormat("M jS Y ", dt)); ^~~~~~~~~~ oled_clock_using_ds3231_rtc_module_:61:27: error: 'class DS3231' has no member named 'dateFormat' display.println(clock.dateFormat("H:i", dt)); ^~~~~~~~~~ oled_clock_using_ds3231_rtc_module_:66:25: error: 'class DS3231' has no member named 'dateFormat' display.println(clock.dateFormat("s", dt)); ^~~~~~~~~~ 🤣😭😥😳

@@mariuspetcu7482Remove the library from that folder and then install the zip file through Arduino IDE. Make sure you use the exact library from the link. There are various libraries with the same name in the net. So remove all libraries reffered to ds3231 and then install the right library again

@@marios_ideas Thank You for the answer mate ... I will do that and post back the result ...

Well the majority memory is used for OLED display buffer. With very little memory nano has to offer any library consuming slightly more memory can cause the bottleneck

WOKWI?

@@marios_ideas Oh, I thought that is how you made the diagram around 7:47. WOKWI is an arduino simulator- I'm new to it.

I do not know that library but I have some projects in the pipeline that will use OLED displays. If I like this library I may use it and do a small tutorial on it

You're welcome:)

no battery or dead battery in the RTC?

@@marios_ideas Seems like I have the same issue. I checked the battery and it was full.

@@donzhu4996 I must be the hardware. Software is just reading the time from the RTC. The problem I had once was the time was always reset to the particular time after restart, and the solution was that there was a line in the code that was setting the particular time. But this is not the case you guys have here

What exactly does not work

„RTCDateTime does not name a type

Nikodem Karcz so do you have an error when compiling? Can you paste the line of code and an error

Did you install the libraries?

@@marios_ideas yup

Having you checked if the device is recognized by i2c bus. Look for the i2c scanner code and run it. It will show you if the module is visible and under which address

@@marios_ideas its not the device issue. Seems some issue with the library. I am able to run the DS3231_simple code of that lib under examples and i get the date and time under Serial Monitor. But when running the DS3231_DATEFORMAT code its not giving any output and gives only blank spaces in the Serial Monitor

@@marios_ideas it was a bug in the library. In the Github page updated library file is there. After downloading that the issue is resolved

At the time of vide creation I had to install the library. So at this stage I chose which one I want to install. If you installed one before and then decide to use Jarzembski's library it is clear that you have to remove the library that has the same name as both cannot coexist. I have never run into this problem as I have never installed the other library to start with. Later I experimented with both but that was after i created this video

first one does not run in nano or arduino

In create.arduino.cc/projecthub/mdraber/tutorial-on-how-to-use-ds3231-rtc-module-e12b38?ref=user&ref_id=1474727&offset=6 there are both codes provided

@@marios_ideas thank you so much i got it !!!, what changes should i make in the 2nd code to show 12 hr format?

@@mominkhadri8062 I want a 12 hr code I've been pulling my hair all day

@@deniker1 same here bro

I will fix it soon. It is the fault of the website i store the code on. They modernised it and it invalidated some of the links

The site where I was storing the code was uprgading and it invalideated all my links. I have moved to hackster.io. Let me know if this works for you

Thanks. Is Nano Every recognised by Arduino IDE as Nano, How do I connect the other board to Arduino IDE

Ups....:) You just spotted the error in my video. I updated the link to the code in the description. There you will find the actual code that was used to achieve the result you see in this video.

Can you elaborate?:)

Explain?