Arduino: 1.8.13 (Windows 10), Board: "Arduino Uno" sketch_apr03b:5:21: error: no matching function for call to 'DS3231::DS3231(const uint8_t&, const uint8_t&)' DS3231 rtc(SDA, SCL); ^ In file included from E:\SD_DATALOGGER1\Original File\sketch_apr03b\sketch_apr03b.ino:3:0: C:\Users\brewp\Documents\Arduino\libraries\DS3231/DS3231.h:66:3: note: candidate: DS3231::DS3231() DS3231(); ^~~~~~ C:\Users\brewp\Documents\Arduino\libraries\DS3231/DS3231.h:66:3: note: candidate expects 0 arguments, 2 provided C:\Users\brewp\Documents\Arduino\libraries\DS3231/DS3231.h:62:7: note: candidate: constexpr DS3231::DS3231(const DS3231&) class DS3231 { ^~~~~~ C:\Users\brewp\Documents\Arduino\libraries\DS3231/DS3231.h:62:7: note: candidate expects 1 argument, 2 provided C:\Users\brewp\Documents\Arduino\libraries\DS3231/DS3231.h:62:7: note: candidate: constexpr DS3231::DS3231(DS3231&&) C:\Users\brewp\Documents\Arduino\libraries\DS3231/DS3231.h:62:7: note: candidate expects 1 argument, 2 provided E:\SD_DATALOGGER1\Original File\sketch_apr03b\sketch_apr03b.ino: In function 'void setup()': sketch_apr03b:15:7: error: 'class DS3231' has no member named 'begin' rtc.begin(); ^~~~~ E:\SD_DATALOGGER1\Original File\sketch_apr03b\sketch_apr03b.ino: In function 'void loop()': sketch_apr03b:51:20: error: 'class DS3231' has no member named 'getDateStr'; did you mean 'getDate'? Serial.print(rtc.getDateStr()); ^~~~~~~~~~ getDate sketch_apr03b:53:20: error: 'class DS3231' has no member named 'getTimeStr'; did you mean 'getMinute'? Serial.print(rtc.getTimeStr()); ^~~~~~~~~~ getMinute sketch_apr03b:59:27: error: 'class DS3231' has no member named 'getTimeStr'; did you mean 'getMinute'? sdcard_file.print(rtc.getTimeStr()); ^~~~~~~~~~ getMinute sketch_apr03b:61:27: error: 'class DS3231' has no member named 'getTimeStr'; did you mean 'getMinute'? sdcard_file.print(rtc.getTimeStr()); ^~~~~~~~~~ getMinute exit status 1 no matching function for call to 'DS3231::DS3231(const uint8_t&, const uint8_t&)' This report would have more information with "Show verbose output during compilation" option enabled in File -> Preferences.