Currently I am thinking about PCF8591 (I2C bus), as I have it at hand.
And I already wrote the code for it (years ago), but I do not have a decent code for timer.
Actually, I worked out something today.. I can start (reading, or whatever) every second or every minute or every hour (by reading system clock via "GetTime" procedure).. but I still need to be able to program the start time, and more flexibility with interval.
I was also thinking about Attiny85 stick
http://www.ebay.com.au/itm/Digispark...item33998f72b1
http://www.ebay.com.au/itm/1PCS-Digi...item3f432ff3ef
(both of them on their way).