[BC] GPS - Contact closure

[W2XJ]

Jeff

Get two really cheap GPS receivers on EBay. I paid around $20 for my no name
blob. Put one in a fixed location and have it transmit to the remote unit.
Put the second on the remote unit. Feed the two serial streams to a PIC chip
or similar microprocessor. Calculate the difference and use a look up table
to determine boundaries. Take one pin on the PIC chip for a contact closure.


On 9/1/08 11:24 AM, "Xmitters at aol.com" <Xmitters at aol.com> wrote:

> 
> 
> Hello:
> 
> Are there any GPS devices out there that would allow me to program in the
> G.C. of the four corners of my property, then ifthe GPS receiver is brought
> outside those four corners, the device will give me a contat closure?
> 
> If not, a receiver that spits out the G.C. ASCII as it is moved, then I can
> write a computer rogram to determine when the receiver location is out of
> bounds.
> 
> The budget is quite tight, so if  the receiver-only that spits coordinates
> can be had for 50 to 100 bucks, the preference is to do that rather than spend
> several hundred on the blob that provides tha contact closure as outlined
> above.