field test results - RFM69HW wireles module range test w/ GPS (see map)

i got around doing range test 2 rfm69hw modules.  if haven't come across them, they're pretty similar nrf24l01, come in 915mhz frequency instead of 2.4ghz.  the -hw chip high power 20db version.  one complication rfm69hw not 5v tolerant.  but, cool thing rfm69 chips antenna can hook-up wire solder onto chip, it's customizable.  knowing nothing antennas, use 6" section of hookup wire shaped in spiral.  these modules seem have greater distances pa version of nrf24l01.  i use different, less congested frequency wifi.

the gps chip ublox 6m.  the gps arduino has ublox gps , rfm69hw wired it, transmitting every second.  but gps location requested every 3 seconds.  not sure if makes sense...i wanted more transmissions of signal gps requests.

the base station arduino connected computer @ home, via usb, serial monitor displaying every time receive location transmission gps arduino.  the struct gps arduino sending time stamp, longitude, latitude, , basestation prints out rssi.

you can see map image farthest pings on 700 feet.  this pretty standard suburban lot, signal going through trees , houses.  my computer next window, helps little.  from time stamps, can see couple of missed transmissions when rssi in -90's.  above -90's (that is, -80, -70, etc...), reliability good.  when 2 arduinos in same room, rssi in -20's.

i have plans make dog tracker, gps unit on dog collar transmitting hand-held unit it's own gps.  the hand-held has gps receiver, , calculates position of relative dog using 2 gps coordinates.  i might use 1 of square led matrix indicate direction of dog.

that cool.  dog tracker, how current need , power source use?
a few years ago, bought "tagg" gps collar our cat.  it, can set boundries , alerts if animal gets past point.
suspect once project going on dawg, can add stuff that.
thanks report , looking forward future reports.<g>
steve

Arduino Forum > Using Arduino > Networking, Protocols, and Devices (Moderator: fabioc84) > field test results - RFM69HW wireles module range test w/ GPS (see map)

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