Loving the tiny nodes! Has anyone weighed them?
I’m working on a use case for a device to track hedgehogs (see http://www.smartearthnetwork.com/pages-104 )
and the device needs to weigh <10g.
Keen to hear how heavy your devices are 
Interesting.
The node is 4g! The lightest GPS I have, with antenna, 7g.
The rest will be a tradeoff between battery lifetime and weight.
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@markstanley You could always add wireless charging to the hedgehog device, then let it sleep on the charger. Job done!
Andrew
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@thinginnovations a world first a battery charger that comes with a saucer of milk!
@thomas is that the teensy+hope one? 4g is brilliant. I’vejust bought a gps module but it’s 9g on its own, so I think gps might be out in favour of triangulation across a few gateways.
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LoRa localisation is not supported in the current generation of concentrators/gateways. It might take a while before it will be available in low-end gateways. If you need something now, think of another solution.
built the small one: Teensy-LC & RFM95W:
I used this node-address: 0x5A4801AA, but without any gateway nearby I think that my “hello world” arrived only some snow flakes in the air
------------------------------ serial monitor dump --------------------------------------
entering os_init
os_init passed
LMIC_reset passed
LMIC_setAdrMode(0) passed
LMIC_setLinkCheckMode(0) passed
LMIC_disableTracking passed
LMIC_stopPingable passed
LMIC_setDrTxpow(DR_SF11,14) passed
Time: 10
Send, txCnhl: 0
Opmode check: ok
Event EV_TXCOMPLETE, time: 17
Time: 130
Send, txCnhl: 3
Opmode check: ok
Event EV_TXCOMPLETE, time: 137
Time: 250
Send, txCnhl: 0
Opmode check: ok
Event EV_TXCOMPLETE, time: 257
foto: not an exhibition item
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Hi Markus, PM (private message? ) if so i have checked but i cant find find a way to send a private message to you. my mail is goudsmitATnoblestreetDOTeu.
regards
arnaud
What is your cpu markus ?
Smaller is better 
There is this module from Nemeus (with also sigfox if needed). 
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Any information on pricing?
Sell by various distributors (mainly in Europe). So prices should be asked to them (no public price list)
Direct sales for other Areas is possible I suppose.Not sure you can buy few pieces…
I have built a teensy/hope device and at 2nd attempt I got it working - thanks to the guidance on the wiki.
Now I am keen to add a GPS module…
In order to manage the power demands I want to be able to switch the GPS and the Hope radio on and off as required. I’ve got a vague idea that I can probably do this with some kind of transistor between the GPS and 3v3, linked to a spare IO pin I can control from the teensy. Same for the radio module.
Am I right? Is there a better way? Has anyone done this already (and can I copy you?!!)
Thanks, Mark
FET would be better than a transistor, I’ll dig out what I used on the flood sensors.
Andrew
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I’m going to chip in just because I have some Anarduino miniwireless boards and would like to keep track of this thread. Please return to your normal viewing…
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Thanks Andrew!
Another small node made from Teensy 3.2 & Modtronix inAir9B (SX1276)
wired as in WIKI : How to build a Teensy TTN node, tested with LMIC 1.5 and the ttn-send program
{
“data_raw”: “QKsBSFoAAAABg6SXO6k9RFDrykMgCCBRkZLSRqNwvd5QBENwhDSb/ZuHrw==”,
“gateway_eui”: “B827EBFFFFE05FEF”,
“node_eui”: “5A4801AB”,
“frequency”: 868.1,
“data_plain”: “Hello from Teensy3.2 & inAir9B”,
“time”: “2016-01-15T14:17:49.201Z”,
“rssi”: -47,
“snr”: 9.0,
“datarate”: “SF7BW125”,
“data”: “SGVsbG8gZnJvbSBUZWVuc3kzLjIgJiBpbkFpcjlC”
}
please update the Hardware Wiki; thanks
.
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You can update it yourself 
That’s the idea of a wiki.
Did anyone have a view on if this would work?
NavSpark mini14 + RFM95W3
11 euro plus $22 seems pretty compelling for GPS included?
Also could you size a solar panel for this with no battery? So the node comes up at sunrise and switches off at sunset?
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It looks like it’d do the job to me @sam_uk - worth a go at that price! The board looks pretty exciting to me and would make for a smaller GPS tracker than I’ve got:
You might want to look at the Microchip RN2483 radio as an alternative to the Hope RF95W, Similar price but certified, and @thinginnovations is having success with these.
Keen to see how you get on
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@sam_uk - had a closer look at the documentation http://navspark.mybigcommerce.com/content/NavSpark-User-Guide_rev0.8.pdf
I’m not sure the Navspark mini (17mmx17mm model) has enough pins for the job - I may be wrong but I couldn’t find where you’d wire in the NSS pin. Perhaps someone with a better grip on this stuff could advise?
The Navspark (non-mini) looks capable enough through.
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