Author Topic: Eggfinder GPS Tracker  (Read 6315 times)

Offline RKeller

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Eggfinder GPS Tracker
« on: November 23, 2015, 07:37:26 PM »
I thought I would do a write up on my experience with the Eggfinder GPS tracker from www.eggtimerrocketry.com
There are several versions now, but they all have similar performance. They are sold as kits that you have to solder together. if you have never done any soldering, these may not be for you but there is nice guy on the rocketry forum who will build them for a small fee.

Here is the basic tx and rx kit


Soldering on the GPS unit is the tricky part with this kit


This is the assembled Tx and Rx boards ready for antenna connections. you can either just solder on the included brass wire antenna, or a RP-SMA connector, which will allow you to use different antennas or coax to remote mount the antenna.
« Last Edit: November 23, 2015, 07:39:50 PM by RKeller »
Riley Keller
URRG
TRA#15415
L1 25 Oct 2014 Estes MDRM CTI H133
L2 25 June 2015 Rocketry Warehouse DYOK, CTI L1030RL 14.7k ft mach 1.57

I'm addicted to building stuff, rockets are just a way to get high

Offline RKeller

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Re: Eggfinder GPS Tracker
« Reply #1 on: November 23, 2015, 07:51:25 PM »
Next I'll build the receiver into a nice box for field use. the basic receiver just outputs the GPS data via serial connection. you can use a serial to usb adapter to feed the GPS data into a laptop, or you can get a serial to bluetooth adapter like the HC-06 for around $5 and have it transmit the GPS data to your phone. I chose to to the latter after doing some testing on the laptop.

This is my Rx with the wire antenna, and the necessary parts to install it in a box, including the new RP-SMA connector I installed instead of the wire antenna. I got everyhting from Digikey except the HC-06 which I got on Amazon.


Installed the connector on the board and drilled/cut the holes in the faceplate of the box

All the parts installed on the faceplate



and installed in the box. I did use a dremel tool to modify the 9V battery holder to fit my lipo battery

It's a tight fit but it fits




Using the Rocket Locator app for android to do a little testing, works great!
Riley Keller
URRG
TRA#15415
L1 25 Oct 2014 Estes MDRM CTI H133
L2 25 June 2015 Rocketry Warehouse DYOK, CTI L1030RL 14.7k ft mach 1.57

I'm addicted to building stuff, rockets are just a way to get high

Offline RKeller

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Re: Eggfinder GPS Tracker
« Reply #2 on: November 23, 2015, 08:01:58 PM »
hey, lets mount this transmitter in a 38mm nosecone!

made a sled and bulkhead out of some scraps of 1/8" plywood I had

that should fit

held on with some shrink tubing for now, actually for a long time until I drilled a few holes and mounted it with some #4-40 nylon screws


I tapped a couple aluminum tubes from a hobby shop for #6-32 screws and epoxied them into the nosecone

Ta Da!
Riley Keller
URRG
TRA#15415
L1 25 Oct 2014 Estes MDRM CTI H133
L2 25 June 2015 Rocketry Warehouse DYOK, CTI L1030RL 14.7k ft mach 1.57

I'm addicted to building stuff, rockets are just a way to get high

Offline RKeller

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Re: Eggfinder GPS Tracker
« Reply #3 on: November 23, 2015, 08:07:38 PM »
I built a 2nd Tx unit with a RP-SMA connector. here it is in a 54mm nosecone sled that mounts the same way as the 38...


And a mount and sled for a 3" nosecone. this was my L2 rocket

Here is the sled, also made from some scraps of 1/8" ply
« Last Edit: November 23, 2015, 08:19:09 PM by RKeller »
Riley Keller
URRG
TRA#15415
L1 25 Oct 2014 Estes MDRM CTI H133
L2 25 June 2015 Rocketry Warehouse DYOK, CTI L1030RL 14.7k ft mach 1.57

I'm addicted to building stuff, rockets are just a way to get high

Offline RKeller

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Re: Eggfinder GPS Tracker
« Reply #4 on: November 23, 2015, 08:09:32 PM »
If you save your flight data on the app immediatly after the flight, you can open the file in google earth, which is fun. this gps system only logs data once per second, and you pretty much lose the signal at high speed so the up path looks really straight, but once it slows down at the top it re-connects and starts sending data.
This flight was supposed to break a mile but it weather cocked a bit and fell about 90 feet short of a mile. doh >:(


This was my L2 cert flight, just shy of 15k feet, although one altimeter read over 15k the GPS and the other altimeter read just shy of 15k
« Last Edit: November 23, 2015, 08:13:23 PM by RKeller »
Riley Keller
URRG
TRA#15415
L1 25 Oct 2014 Estes MDRM CTI H133
L2 25 June 2015 Rocketry Warehouse DYOK, CTI L1030RL 14.7k ft mach 1.57

I'm addicted to building stuff, rockets are just a way to get high

Offline RKeller

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Re: Eggfinder GPS Tracker
« Reply #5 on: November 23, 2015, 08:21:32 PM »
and this one is called the Eggtimer TRS, which stands for total recovery system. it is a GPS tracker and deployment altimeter in one! I acquired this unit from a fellow URRG member along with a nicely built eggfinder LCD receiver!

Riley Keller
URRG
TRA#15415
L1 25 Oct 2014 Estes MDRM CTI H133
L2 25 June 2015 Rocketry Warehouse DYOK, CTI L1030RL 14.7k ft mach 1.57

I'm addicted to building stuff, rockets are just a way to get high

Offline Larry Weibert

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Re: Eggfinder GPS Tracker
« Reply #6 on: May 08, 2016, 08:41:34 AM »
That's cool Riley.
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