your Eggfinder RX into a USB port on your laptop/tablet, the RED LED should immediately
come on indicating that you have power. After one or two seconds, the GREED LED on the
RF module should begin blinking, indicating that it is receiving data from the Eggfinder TX
board. If you place the boards close to each other, you will see that the LEDs on the Eggfinder
RX and TX boards are in sync with each other.
In order to receive serial data on your laptop/tablet, you may need to load the cable’s serial
driver onto your laptop. The cable uses a Prolific PL2303HX chip, you can get the driver at:
http://prolificusa.com/pl-2303hx-drivers/
Pick the one that’s appropriate for the operating system that you’re using. Note: If you have
Windows 8, you may need to use an older “Vista driver” in order for it to work on your PC.
Don’t ask us why, it just seems to work. Check the Eggtimer Rocketry web site under
Support/Documentation for the older driver version.
A good program to test the GPS operation of your Eggfinder is VisualGPS, it’s a free Windows
program that logs the NMEA data, shows you the approximate location of where it is on a
“grid” system (not on a map, though), and shows you the satellite strength. The nice thing
about it is that it will automatically pick up the serial port that’s being used for the GPS data,
so you don’t have to figure it out.
Alternatively, you can use a simple serial terminal program (such as Hyperterminal or PuTTY)
set to the serial port that’s being used by your device. Simply connect to the port, and you
should see the serial data feed from the GPS. You need to set the port to 9600 baud, 8 bits, no
parity, 1 stop bit, and no handshaking/flow control.
Once you’ve confirmed that everything is working, you can turn off the Eggfinder TX by
holding the button down until the GREEN LED goes out, the GREEN LED on the Eggfinder
RX module should also immediately stop blinking since no more data is being transmitted.
Unplug the USB cable, remove power from your Eggfinder TX board, and you’re all done!
Troubleshooting
If your Eggfinder RX doesn’t work after assembly and testing, take a deep breath, get out a
beverage to clear you mind, and start troubleshooting…
Check Your Solder Joints
The very first thing you should do is to check out all of the solder joints under a lighted
magnifier, or with a 10x jeweler’s loupe or magnifier. The most common reason for things not
working are solder bridges, i.e. putting too much solder on the pads and shorting two adjacent
pads together. You can also get into problems by bridging pads with “vias” on the board, the
smaller holes that don’t have any components soldered to them. Most of the holes and the pads
are very small, so it doesn’t take much solder to get a nice “tented” solder joint. If you get a
solder bridge, heat it up and use a solder wick or a vacuum bulb to remove the excess;
afterwards, we recommend resoldering the joints. Note: NEVER use “canned air” or
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