You're not measuring voltage. You're measuring resistance, or in your case, you're looking for the lack of it between two pins. Dave Kreskowiak Microsoft MVP Visual Developer - Visual Basic      2006, 2007

Just read the whole article, instead of only the first section.

Dear Noora, I would suggest interfacing to the graphic LCD: something like... http://www.crystalfontz.com/products/index-grph.html Maybe making a small game like PONG using the mouse

What do you mean by 'traffic maps'? You have a list of positions, and want to show them as a route? You have GPS positions, so you probably need to find out how to convert them to whatever coordinate system your mapping software uses. In the UK, for example, this could be Lat/Long or OSGB. MapPoint could probably do a lot of what you want. Hardest point, IME, is sourcing the map data, as this usually isn't free (to acquire or to use). There are companies who specialise in providing map servers which could do that part. Steve S Developer for hire

Read the specifications[^] and pick the one that fits your requirements. Do you need the PPS signal available on the LVC model? Do you have a 12V (8-30V) supply that the PC model needs?