Page 245 - Build Your Own Quadcopter_ Power Up Your Designs with the Parallax Elev-8

224 Bu il d Y o ur O w n Q u a d c o p t e r

The transmit code was modified to transmit only the four GPS data elements discussed
above. I also eliminated the commas between the data elements to conserve space on the
LCD display. The modified transmit program named GPS_XBee_Brief is shown below.

{{
GPS_XBee_Brief
Modified !GPS_Propeller program by D. J. Norris 2013
This program controls an Elev-8 Quadcopter real-time data system
This brief edition transmits only four data elements:
Latitude
Longitude
Speed
Altitude

Pin connections:
Transmitter:
XBee DOUT to P7
XBee DIN to P6
GPS Rx to P8
GPS Tx to P9
Receiver:
XBee DOUT to P7
XBee DIN to P6
}}
CON
_clkmode = xtal1 + pll16x
_xinfreq = 5_000_000

XB_Rx = 7 ‘ XBee DOUT
XB_Tx = 6 ‘ XBee DIN
XB_Baud = 9600
CR = 13 ‘ Carriage Return value
GPS_Pin = 8
OBJ
GPS : “GPS_Float_Lite”
FS : “FloatString”
xb1 : “XBee_Object_1”

Pub Start | fv
xb1.start(XB_Rx, XB_Tx, 0, XB_Baud) ‘ Initialize comms for
XBee
xb1.AT_Init
xb1.AT_ConfigVal(string(“ATMY”),8)
xb1.AT_ConfigVal(string(“ATDL”),9)
GPS.Init