Let's Make Robots!

Servo problem: only 1 direction.

Another noobquestion here :)

 We have a servo modified for continuous rotation and when we get the 5V power from the PICAXE 28X1 it works just fine, but when we attach the red and black wire directly to a 9V battery it turns only one direction (Clockwise). It seems it's not making a difference between clockwise and counterclockwise :(

 This is the code:

main:
servo 0,75
servo 7,75             =for the servo bug :(
pause 1000
low 0
pause 1000
servo 0,225
pause 1000
low 0
pause 1000
goto main

How to recognise dark places?

Hello,

We're trying to create a robot that can "see" dark places and drive to it for our final project for school... One of the things it must be able to do is of course finding the dark places. Since we have nearly no experience with building robots we hope there are some people in here that could help us with some (easy?) questions.