XIAO Expansion board RTC battery didn't work

Products & Technology
1

I had a problem where the RTC wasn’t maintaining time when the board was not powered on. I determined that the backup battery was not supplying power to the RTC. It turned out to be a dirty ground contact on the PCB for the battery. I was able to clean it using tissue, tweezers and alcohol.

Just thought I’d mention it because I suspect this is a common problem.

2

Do you have a code example of using the built in RTC clock on the XAIO?

I’m not having luck using the built in RTC.

Thanks!

3

Sorry, I’m using the RTC on the expansion board with the code from the WiKi and that works fine.

I haven’t tried the SAMD21 internal RTC. Not sure what example you are trying, but it’s probably an issue with the way the clocks are configured.