Haven't checked soft- or hardware squirrel detection algorithm yet to solve the mystery of absence of squirrels. However, I thought it would be no harm to show that The Squirrel Cafe is open 24/7. Therefore I've attached a sign to show just this:
![](https://image.jimcdn.com/app/cms/image/transf/dimension=659x10000:format=jpg/path/s0eb260a79abd3e98/image/i82cc9ae68a2705be/version/1469880265/image.jpg)
[Update 2016-07-31] I've checked hard- and software today. The algorithm works flawlessly, no errors detectable. I've manually opened the lid and a corresponding tweet has been sent out which I've deleted thereafter.
![](https://image.jimcdn.com/app/cms/image/transf/none/path/s0eb260a79abd3e98/image/i4304288afd6b802c/version/1469969993/image.jpg)