Let's Make Robots!

picaxe trouble

ok,

I just got a new picaxe 28x1 for christmas. I was trying it out and the pins don't seem to be working.

For example:

I connected a led to output pin 3 and ground and uploaded the code

main:

high 3

pause 5000

low 3

pause 5000

goto main

For some reason this code doesn't seem to do anything as the led just stays on constantly. and, yes I did wire the anode and cathode the right way

Is there something wrong with my chip, or am I just doing something incredibly obvious and dumb? 

 

Temperature Sensor?

Ok,

Right now i am planning to build a autonomous robot that puts out fires. It will go up to a tiny fire (about 4 inches) and then drop a tiny bucket of water (2 1/2 inches wide, like the ones that came with the old version of robosapien) on the fire. The bucket will be put on a platform attached to a servo. when the servo turns the bucket will pour. I am going to do this all with picaxe. I know how to use picaxe, and coding in basic.  Anyways what my real question is, Is there a type of sensor that i could use to find the fire and stop before it? Could I use IR somehow?