Let's Make Robots!

Serial RFID reader troubles

I recently purchased the seeedstudio serial RFID reader for 125khz tags, but I cant really understand the datasheet. I am having trouble figuring out how I am supposed to interface it with my picaxe. 

Here is the product:

http://www.robotshop.ca/seeedstudio-125khz-rfid-module-uart-2.html

And her is the datasheet:

http://www.robotshop.ca/content/PDF/datasheet-rfr101a1m.pdf

Avoid Obstacles, Search for charging station when battery is low.
Using a
This robot normally goes around avoiding obstacles and (sometimes) edges until its batter drops low. Then the robot goes towards a 38khz pulse instead of away from … Read more

Heat Tracking Robot Arm/Head

Ok, I have been wondering if it would be possibly to build a robot head or arm that tracks thermal energy. You know how there are special thermal cameras that show areas of higher temperatures in different colors? I'm guessing those are pretty expensive, so would there be a simpler and cheaper way of building a thermal sensor? I was thinking of PIR sensors, but they can't really sense how hot something is, just if what its looking at is hotter than average.