tab wrote:...your solution seems to be very simple!...
I guess whether something is simple or complicated depends upon the capabilities of the individual. You don't need to be a Guru, but probably need to be a bit of a Fundi, and know your way around a soldering iron.
A Picaxe is a special PIC produced mainly for education and hobbyists. If you normally work with Linux, take a look at my notes: http://captainbodgit.blogspot.co.uk/201 ... linux.html
. Either way, also take a look at their website: http://www.picaxe.com/
The main documentation is centred on 4 manuals: http://www.picaxe.com/Getting-Started/PICAXE-Manuals/
Manual 3 covers interfacing.There may be an RTC interface in there. If not, then "Google" as I'm sure someone would have done it already.
And take a look at my post (http://captainbodgit.blogspot.co.uk/201 ... tails.html
) which includes a circuit showing a mosfet controlling a 5Volt regulator which powers the Pi.
I'm convinced that the Pi GPIO inputs are 5Volt safe, so connecting a 5V Picaxe to a Pi is not a problem...you may have to make up your own mind!