Let's Make Robots!

buried wire

Buried wire fence

    Hey all, well I am revisiting my lawnmower project, well not really concerned with mowing lawn but more of an outdoor autonomous robot for my backyard..

    Anyway I spent ALOT of time with circuits over the past winter and with no real success. So to cut rapidly to the chase what I am trying to design/figure out is a buried wire fence type solution that I can put in my back yard with 2 sensors (left/right) on the robot and when it gets close to the wire it can either avoid it or follow it home depending on programming..

Inductive Guidance

       I am trying to build a robot lawnmower(yes another guy trying this).. I need to understand Inductive guidance or RF technology a bit better to build a buried wire circuit for this.. I have read alot on the web and am starting to understand inductor/capacitor circuits.. I built a transmitter using a 555 and a 2n2222 to raise the current in the wire.. I then built a L/C circuit with a 339 comparator and I can tune it to pick up the signal from the wire(I can see this on my oscilliscope)..