Let's Make Robots!

The best "cliff" detector

Hello, I am wondering if anyone has any personal preferance towards sensors for cliff detection. I am starting a new robot that needs this. Any suggestions?

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.
Microswitch with roller activator. Have the roller of the microswitch rest against the floor. When the activator is deactivated you are flying off a cliff.
LOL I think by then it is probably too late and the bot should deploy its parachute or gadget-copter!
Well you can put it on the ends of your robot.
Thanks for the suggestion, but I want something that can be flush with the bottom. Something that will work with a picaxe 28x1
Hehehe I'd equip it with a voice synth, or pre-recorded with "oh shiiiii-" while it flys off!

What do you mean by flush with the bottom?
How can you not use a switch with a picaxe 28x1?
the bottom of my robot is completely flat, so something that I could fit in by cutting some of the bottom out and fitting it so the bottom is basicly flush again.
so the bottom is completely flat

May I suggest, because looks matters: