In car temperature monitor/logger

[system]

Hi all,
A friend of mine recently asked me to make him something which would let him view temperature readings from 4 probes placed in different areas of the car. These readings will then be displayed on a 20x4 ascii LCD. It will also have data logging, to record temperatures every 5, 10min (unsure of exact intervals at this stage).

So, here are the questions:

• I have found a sensor which I think would do the job (Waterproof 1-Wire DS18B20 Digital temperature sensor : ID 381 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits). How effective would this be connected to an i2c adapter?
• What is the best protocol to use for the LCD?
• What is the most effective method for data recording to an SD card?

If this post is irrelevant to the topic, please feel free to move it.

[Nick_Pyner]

That device is aDS18B20. You can get them for about half the price on eBay - plug included. There is no point in using the I2C bus, they have their own one-wire system

Arduino 1-Wire Tutorial

4x20 LCDs are usually supplied for use on the I2C bus and uise a library apprpriate for that.

You will need an SD module or use an Arduino with SD included

[system]

Thanks for the help Nick_Pyner!