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Hi everyone
I have finally more or less completed my build of the Surf Pi and I have it working ok!
My coil is apparently only about 50 microhenries (as measured by a friend of mine) so there is room for improvement. I can still detect a coin at about 25-30 cm though.
As I said I varied the design to include a pinpointer into the design and it works really well. The ferrite rod and coil were measured at about 600 microhenries and can detect metal at about 3 inches!
I will be doing a segment for the Vidcast I help make on the build so you will get to see it in action as well as all the finer points as to how it was built. You should be able to see the segment around 15th April at http://www.amateurlogic.tv
Thanks very much to everyone who helped debug the problems I was having. My problem turned out to be a mixture of problems including where part of the circuit board had lifted.
Photos below
cheers Peter
I have finally more or less completed my build of the Surf Pi and I have it working ok!
My coil is apparently only about 50 microhenries (as measured by a friend of mine) so there is room for improvement. I can still detect a coin at about 25-30 cm though.
As I said I varied the design to include a pinpointer into the design and it works really well. The ferrite rod and coil were measured at about 600 microhenries and can detect metal at about 3 inches!
I will be doing a segment for the Vidcast I help make on the build so you will get to see it in action as well as all the finer points as to how it was built. You should be able to see the segment around 15th April at http://www.amateurlogic.tv
Thanks very much to everyone who helped debug the problems I was having. My problem turned out to be a mixture of problems including where part of the circuit board had lifted.
Photos below
cheers Peter