Re: Thermostat with RS232

["Patrick Lidstone <patrick@xxxxxxx>" <patrick@xxxxxxx>]

If you have comfort, you can connect cheap temp sensors direct to
(IIRC) the first 8 inputs, which are also analogue capable - although
I've never tried this myself.

You will still need the ability to manually decide on a
setpoint/override the heating I guess? You could do this by
connecting the existing thermostat to a comfort input, instead of to
the heating. This then allows you to decide whether to accept the
human setpoint or not - e.g. if the house is empty.

If you can live with a PC of some description (or perhaps Home
Vision, which is anything but cheap), then the Quasar temperature
boards are a flexible solution - around 30 quid or so will set you up
with 4 independent temperature readings reported over a serial
interface.

If you are a DIY'er then you could hang on for the xAP telemetry unit
PCBs. These will provide thermostat like functionality, interface to
comfort direct or via a PC (PC not mandatory), and are fault tolerant
to a degree, depending on the final configuration.

Patrick


http://www.automatedhome.co.uk
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