The WORKBENCH part 3


#131

shitnode

combination of occupancy sensor, airquality sensor and out of paper emergency button.


(Ud Lo Ra) #132

Toothpicks are useful. (this was a single channel gateway, with USB cable out from the back, but can host a battery too).

scg


#133

x1246

’ I can join the network ABP but OTAA doesn’t work ’


(Jezd) #134

is that real? :slight_smile: (just noticed the cherry on the cake, the usb power board on the bottom left)


(Jeff Uk) #135

Damn I knew someone was spying on me…

…and that building my own SX1301 from tranny’s and wires wasnt such a good idea…


#136

x1247

I ordered some more rolls due to expected bad programming on my side :roll_eyes:

(if I see the date on the testprint its a very old production batch :rofl:)


#137

x1248

after some config settings with AT commands, the MAXIIOT DL7612 is happy to connect OTAA to TTN.
3 to 4 gateways have seen the first few packets…cool :sunglasses:
but some ‘fine tuning’ needed

hallo%20OTAA%20world


#138

REDLIGHT

:shushing_face:


(Jezd) #139

is that glowing? :slight_smile:


#140

yes :sunglasses: it’s someones solar diy battery storage …doesn’t feel good to me


#141

Just got an idea to control that maxiiot stick… if I just could plug it in a RPI A+ with HDMI touchscreen.
And then some basic GUI… I’ll try to install and oldie called ‘gambas’… a visual basic clone I worked with many years ago and its perfect for fast GUI’s… let’s see :flushed:

x1249

gamb

  • update… seems to work :crazy_face:

x1250

  • first tests - probs

x1251

x1252


(Jeff Uk) #142

Have recently been developing/playing with the RAK 5205 WisTrio Tracker Boards (SMA version per the ‘Nuts’ above and lately with the uFl/iPx connector version for smaller nodes).

The iPx version comes with GPS & LoRa Patch ant that I was interested to test and for v.small nodes:
image

But what to house it in?..enter an old failed Low Voltage Lighting Xfromer that looked about the right size:
image
Mount the LoRa patch and GPS Lozenge in lid:
image
Follow with the PCB & a 1200mAh battery (a bit big but what I had in stock…)
image
And finally a bit of white PCV tape to temporarily close the box…not too bad:
image
Well maybe not too good…the battery too big on top of the RAK5205’s 96Boards connector :frowning:image
So a couple of hours after modding a design & firing up the 3D Printer…this one :slight_smile:
image
…actually the internal pillars made it 1-2mm too tight so spun the design this evening to slacken slightly…tomorrow I assemble & test to see how the PLA affects any RF signals etc. As basically a sealed box the temp/hum monitoring will be no good due to self heating but this one is intended as an animal/asset tracker only.


RAK 5205 tracker
(Mrpackethead) #143

Hi, is this tracker suitable for using with the ttn-mapper stuff? Looks like it has everything you need.


(Amedee) #144

PiSupply2-008

Holder for the @BoRRoZ thermometers :wink:


#145

beauty :sunglasses:


(Jeff Uk) #146

Left a RAK5205 running on battery over last couple of days to see how it behaved:
image
Died in the early morning hours…interesting to see the rate of decline towards the end and more importantly last voltage measured before death was 2.59V…need to investigate the ‘accuracy’ of this value but feels a little low before battery protection cuts in…


#147

what is the current draw Jeff ?
would be a good thing if the node sends a last message on a ‘low power alert port’ before switching itself off.


(Jeff Uk) #148

I need to get into detailed measurements and analysis/optimisation. Client requirement was just for a quick & dirty tracker that could give asset movement overview for minimum 24hrs, ideally 48hrs, before opportunity for a recharge based on 15min location updates. To test durability I have an onboard app running continuously to stress system (based on RAK binary), with reporting of minor data e.g Temp or battery voltage (Shorter payload/time on air to limit duty cycle) every ~2-15 mins, then a bigger location update every 15/30 mins. Things like minimising sleep current etc not yet a concern :wink:

I currently have a crude test running on another unit as outlined with usb power but no local battery connected, to log the 4/8/12/16/20/24hr consumed mAh overall avg. Once I have that data I will post back here, then next steps will be to start looking at power profile, peaks, sleeps etc.

The more relaxed version (approx 32x46x82mm) of the printed case worked a dream…just printing a couple for housing addition proto’s. Now also need to cut in a USB port for charging. Finished version will use (probably Qi) wireless charging :wink:
image


(Jeff Uk) #149

What has surprised me a little is the variability of the GPS location! I know the signal is ‘dithered’ and randomly scambled for security/mil use but I guess we all get conditioned by our car sat nav’s, smart phones etc. and they are helped by AGPS, DiffGPS, local network sniffing etc.! This is this mornings set of data points:

image

A full set of 24hrs data shows even wider spread!
image

The node is actually close by the large tag in each case and wasn’t moving!

How to improve? :thinking: Ideally looking for <20-30m displacement from 'real location for >90% of samples


(Ud Lo Ra) #150

This is not my experience. Just a couple of samples from yesterday, in a couple of places I stopped for about two hours each (overcast with some rain).

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