Mini GPS telemetry system

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ROCKet STAR
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Mini GPS telemetry system

Postby ROCKet STAR » Thu Feb 05, 2015 11:57 pm

I thought I would share a little project I have been working on for a while. It is miniature GPS system that is specifically designed for small airframes with limited space. They have a 100mW power output, utilise frequency hopping and come in both 433Mz and 900MHz flavours. The prototype boards I have managed to get down to 18.5mm x 58mm, however they have been produced on a single sided PCB. Assuming they perform as expected, I'll have some professionally made double sided PCBs produced. Doing so I believe I can reduce the footprint significantly. I'm not sure whether I'll be able to produce a unit that will fit inside an 18mm tube, but I'll certainly give it a go! As it is, it fits into a 24mm tube and there is still enough room to swing a cat. :twisted:

I'll have a handfull of units with me at Thunda to do some testing...

minigps.JPG
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Re: Mini GPS telemetry system

Postby cryoscum » Fri Feb 06, 2015 1:53 am

Very nice indeed!
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Re: Mini GPS telemetry system

Postby str8up » Fri Feb 06, 2015 5:40 am

This I want to see. Very cool Chris. Small diameter rockets and high altitudes don't mix very well (if you want them back that is) - this will be a God send.
Very interested.

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Re: Mini GPS telemetry system

Postby cryoscum » Fri Feb 06, 2015 5:48 am

Is that a polarity protection diode I see there?? Just keep Mike P away from the damn thing! :lol:
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Re: Mini GPS telemetry system

Postby CATO » Fri Feb 06, 2015 7:02 am

Nice Chris... Please keep the forum updated with the progress...
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Re: Mini GPS telemetry system

Postby air.command » Fri Feb 06, 2015 7:15 am

That's very cool Chris. I'm very much looking forward to the results you get with the trial flights. How much does this one weigh?
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Re: Mini GPS telemetry system

Postby Kryten » Fri Feb 06, 2015 7:26 am

This looks way cool!
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Re: Mini GPS telemetry system

Postby SpaceManMat » Fri Feb 06, 2015 9:07 am

Nice I've always wanted to fly a MD 18mm with a D motor.
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Re: Mini GPS telemetry system

Postby Scoop1261 » Fri Feb 06, 2015 10:35 am

Nice! 8)
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Re: Mini GPS telemetry system

Postby matthew » Fri Feb 06, 2015 6:06 pm

Very cool. The Eggfinder has certainly shown there's a market for such devices, so if you end up doing batches you'll have no trouble selling them.

What do you use as a receiver?
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Re: Mini GPS telemetry system

Postby Sumo310 » Sat Feb 07, 2015 10:46 am

Nice! Let me know if you need a 24mm rocket to test in ;)
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Re: Mini GPS telemetry system

Postby High Impulse » Sun Feb 08, 2015 4:05 pm

It looks good Chris,

Any ideas on the estimated range or is that something that Thunda will sort out?

I look forward to seeing how they work out :)

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Re: Mini GPS telemetry system

Postby drew » Tue Feb 10, 2015 10:00 am

Excellent work Chris. I look forward to seeing your prototype first hand!
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Re: Mini GPS telemetry system

Postby ROCKet STAR » Tue Feb 10, 2015 12:12 pm

Wow, wasn't expecting quite such a response! This is still a work in progress with the thread acting as a motivator to get everything done before Thunda. Still have some issues to resolve before then. The current issue is a configuration one. The original plan has been to set up the Si4432 chip in asynchronous direct mode, which allows it to independently determine the data rate of the incoming data, and then directly transmit it at that rate. Setting up the chip to to do this simply requires the sending of some configuration commands, however I was caught out by the fact that these configuration settings are not retained once the unit is powered off... DOH! :oops:

It's not too big a deal. I'll just have to add a small microcontroller to send the config settings to the Si4432 at powerup.

I'll update in a few days. :)
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Re: Mini GPS telemetry system

Postby str8up » Tue Feb 10, 2015 12:53 pm

What's required to receive the data Chris?


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