[Xastir] Garmin Tempe

[Fred Hillhouse]

I learned a small bit more since yesterday.

The Tempe is a transmit only device. My watch (Garmin Instinct) and my GPS (Garmin GPSMAP 64st) are both receiving the temperature now. The Tempe does not send data continuously. The watch shows a "Not connected" state until a temperature packet is received. The GPS shows the data constantly once it receives data.

I also re-learned the RTL is not going to work. Thanks for the reminder Jason!

I am curious it the GPS actually includes the data in a sentence or not. When I get a chance, I'll check that.

There are some USB transceivers in the $15 range on Amazon.

Hmm, plotting waypoints on a GPS? On my GPS, the only options for ANT are: heart rate, bike (speed cadence), Tempe. Receiving waypoints probably won't work but I can't really say either way. There is an option to send/receive wirelessly but in the option it list 'Base Camp Mobile'. So it could be a Bluetooth connection. The only mobile link I could find points to iTunes. There are Windows and Mac BaseCamp. Other than this short diversion, I have not explored much.

Best regards,
Fred N7FMH


-----Original Message-----
From: Xastir [mailto:xastir-bounces at lists.xastir.org] On Behalf Of Jason KG4WSV
Sent: Friday, February 21, 2020 7:59 AM
To: Xastir - APRS client software discussion
Subject: Re: [Xastir] Garmin Tempe

When ANT (not +) came out a few years ago I looked to see if it could be a Bluetooth-like connection to a mapping GPS. No joy then.  Now I see there’s the + version of the protocol, it’s still proprietary but “open access” instead of completely closed, and there are USB dongles available, so maybe it’s worth another look. 

I did some cursory googling and the only open source stuff I saw was python (ugh). 

RTL-SDR won’t work since ANT+ is 2.4GHz and the RTL tops out at 1.7GHz. 

I’d be surprised if the device simply transmitted every so often, since that’s not very power efficient. That would be the only way to make use of a receive-only station. you’ll probably need an ANT+ transceiver to talk to it. 

Still, worth looking into. I’d drop US$30 on a USB transceiver if it let Xastir plot waypoints on a Garmin mapping gps. 

-Jason

> On Feb 20, 2020, at 8:16 PM, Fred Hillhouse <fmhillhouse at comcast.net> wrote:
> 
> Greetings,
> 
> 
> 
> This may be mostly OT but I believe someone here has worked with the Garmin
> Rino. Along the same lines, has anyone worked with the Garmin Tempe? It
> looks like it could be a simple solution for a remote sensor. Since it uses
> 2.4GHz, I suspect a RTL device might work to receive it.
> 
> 
> 
> It uses the ANT+. I have included a few link for those that are curious.
> 
> https://buy.garmin.com/en-US/US/p/107335
> 
> https://en.wikipedia.org/wiki/ANT_(network)
> 
> https://www.thisisant.com/consumer/ant-101/what-is-ant/
> 
> 
> 
> Thanks!
> 
> 
> 
> Best regards,
> 
> Fred N7FMH
> 
> 
> 
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