Welcome to EnviroDIY, a community for do-it-yourself environmental science and monitoring. EnviroDIY is part of WikiWatershed, a web toolkit designed to help citizens, conservation practitioners, municipal decision-makers, researchers, educators, and students advance knowledge and stewardship of fresh water. New to EnviroDIY? Start here

Reply To: [rtc] time kept without power (has cr1220)?

Home Forums Mayfly Data Logger [rtc] time kept without power (has cr1220)? Reply To: [rtc] time kept without power (has cr1220)?

#1606
Shannon Hicks
Participant

I just did some more testing with a dozen boards. Out of all of them, I found one that exhibited behavior similar to yours. It looks like the green solder mask paint is thick enough on some boards that it is preventing the battery’s negative side from sitting completely flush against the circular ground pad on the Mayfly board. You can easily remedy this by adding a very small layer of solder to the circular pad, if you have a fine enough point on your soldering iron to reach the pad without creating a solder bridge to the metal of the battery connector above it. Or you can solder a very small drop of solder in the center of the battery, like in the attached photo.

Attachments: