# Tag: RTC

The featured image of this blog post is by Steve Buissinne on Pixabay

In 2013, we found the Seattle-Köln Exchange Multicache, which requires cooperation between geocachers from Cologne and Seattle. This led to the idea of a geocache where two people at different locations had to press a button at exactly the same time in order to be able to open their respective cache boxes. And now the idea has become reality!

What is the overhead imposed by the millis() interrupt? And can we get rid of it?