Header Files Problems

Projects Networking, Protocols, and Devices
1

I can not get the DS3231 code to work because of header file problems. I followed the following link but no success.

I followed exactly what did this paper told me but no luck so far. The errors are as follows

RTC_Test.cpp.o: In function `setup':
C:\arduino-1.6.5-r5/RTC_Test.ino:26: undefined reference to `DS3231::setSecond(unsigned char)'
C:\arduino-1.6.5-r5/RTC_Test.ino:27: undefined reference to `DS3231::setMinute(unsigned char)'
C:\arduino-1.6.5-r5/RTC_Test.ino:28: undefined reference to `DS3231::setHour(unsigned char)'
C:\arduino-1.6.5-r5/RTC_Test.ino:29: undefined reference to `DS3231::setDoW(unsigned char)'
C:\arduino-1.6.5-r5/RTC_Test.ino:30: undefined reference to `DS3231::setDate(unsigned char)'
C:\arduino-1.6.5-r5/RTC_Test.ino:31: undefined reference to `DS3231::setMonth(unsigned char)'
C:\arduino-1.6.5-r5/RTC_Test.ino:32: undefined reference to `DS3231::setYear(unsigned char)'
RTC_Test.cpp.o: In function `ReadDS3231()':
C:\arduino-1.6.5-r5/RTC_Test.ino:39: undefined reference to `DS3231::getSecond()'
C:\arduino-1.6.5-r5/RTC_Test.ino:40: undefined reference to `DS3231::getMinute()'
C:\arduino-1.6.5-r5/RTC_Test.ino:41: undefined reference to `DS3231::getHour(bool&, bool&)'
C:\arduino-1.6.5-r5/RTC_Test.ino:42: undefined reference to `DS3231::getDate()'
C:\arduino-1.6.5-r5/RTC_Test.ino:43: undefined reference to `DS3231::getMonth(bool&)'
C:\arduino-1.6.5-r5/RTC_Test.ino:44: undefined reference to `DS3231::getYear()'
C:\arduino-1.6.5-r5/RTC_Test.ino:46: undefined reference to `DS3231::getTemperature()'
RTC_Test.cpp.o: In function `__static_initialization_and_destruction_0':
C:\arduino-1.6.5-r5/RTC_Test.ino:11: undefined reference to `DS3231::DS3231()'
collect2.exe: error: ld returned 1 exit status
Multiple libraries were found for "DS3231.h"
 Used: C:\Users\tr\Documents\Arduino\libraries\DS3231
 Not used: C:\arduino-1.6.5-r5\libraries\DS3231
Error compiling.

I am using Arduino 1.6.5

2

Can anyone tell me how to specify the head file directory path in Arduino

3

walraven92:
Can anyone tell me how to specify the head file directory path in Arduino

I don't think you can with libraries. The Arduino IDE has a set order of precedence it uses when the same header filename occurs in multiple libraries. In this case the library in C:\Users\tr\Documents\Arduino\libraries\DS3231 will always be chosen over C:\arduino-1.6.5-r5\libraries\DS3231. If you change the folder name from C:\Users\tr\Documents\Arduino\libraries\DS3231 to something like C:\Users\tr\Documents\Arduino\libraries\DS3231_2 then the library in C:\arduino-1.6.5-r5\libraries\DS3231 will be chosen instead because preference is given to the header filename that matches the folder name. Note that you're not supposed to install libraries to C:\arduino-1.6.5-r5\libraries\ because then you will need to reinstall every time you update the IDE. If you want to work with multiple versions of a library one way is to use git branches, then you can just checkout the branch you want to use before compiling. You could also create a second sketchbook location like C:\Users\tr\Documents\Arduino2\ and put one version of the library in each sketchbook and then switch the sketchbook location back and forth in File > Preferences.