I finally got round to copying a programme from a book into the BBC which will draw a graph which depends on the light or heat going into an LDR or a thermistor connected to the analogue port (why don't PCs have analogue ports bult in so you can do cool stuff like this?).

It draws the graph from the left hand side of the screen to the right, over a period of about 5 seconds, then clears the screen and starts again.

Does anyone here know of any software which can be used to draw graphs over set periods of time, and then save/print them? And preferably give values in celcius?

It isn't possible to do this at the moment with the programme from the book as all it does is look at the voltage going into the analogue port and has no way of determining what the temperature/brightness is. For the graph, I could probably set it to spend longer drawing the graph, and therefore maybe have a graph for an hour, rather than just a few seconds, but that doesn't help with the units or printing.

An additional device may be required, but I would still be interesting in finding the device and some software which would do this. I know such software exists as we were shown these things on the BBCs in school a couple of years ago.
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