Home automation

Our house has many radiators and seems hard work to heat up properly.  All the radiators bar one have TRV's, but at night we only want three rooms heating up.  The plan is to zone the heating.

I have had a look around and seen many home automation kits that will zone my heating.  They are all expensive and don't quite do what I want.

I got some of these from Maplin, they were only £15 for three...

They come with a remote control and a battery for the remote.

Very nice.  I opened up the sockets, which requires a security bit, to check the quality of the units.  They are fine and no surprises about whats in there.
Inside the remote there is the usual SAW oscillator driven by an encoder chip.  The chip in question is SC5262S.  A simple chip that serializes a number of input pins.  As far as the remote goes, knowing the encoding scheme and transmission frequency are all I need it for so I'll put it in the junk drawer.
I want to control the sockets from my PC so a PIC16F1455 (Microcontroller with USB in a 14 pin package :) coupled to a 433MHz oscillator should do the job...

I built a 'prototype' oscillator on a bit of board using surface mount components...

There are components there! The schematic is 'as built' and it oscillates at about 431MHz.  Thats quite a way off the calculated 635MHz of the schematic, but what can you expect from what looks like a blob of solder.