Loading...
 
Projects        
Print

Projects

On this page

Our first working end-to-end example
Mapping signal strength around Reading
Hedgehog tracking
Smarter car alarm
LoraWAN triangulation Easter egg hunt

Our first working end-to-end example

The original page is here(external link)


Mapping signal strength around Reading

I've added a GPS sensor to a mDot wireless and I've written a little mDot code so that the device sends the gateway its position and the signal strength indicator every couple of minutes.

I've written a small node.js program that runs on the gateway and listens out for the packets, and then logs the details.
Here's the map:
https://www.google.co.uk/maps/@51.4408832,-0.9682868,17z/data=!3m1!4b1!4m2!6m1!1szwWgqr-Dfqjc.kT1yfNiNCErw(external link)


Hedgehog tracking

The Smart Earth Network(external link) is running a challenge to develop a tracking device for monitoring hedgehogs in Regent's Park in London.
Image

TTN Reading is working on a small LoraWAN tracking device, and hedgehog tracking is an interesting specific use case for such a thing. Somehow through conversations with Simon Hodgkinson of Smart Earth Network and Mike the Bee at rLab we have agreed to work together on building a prototype.

Two key things to explore:
  • LoraWAN triangulation - we want to see whether we can achieve accurate (<10m) positioning of the hedgehog using LoraWAN triangulation rather than GPS.
  • Power management - we need to be really stingy with power consumption to keep the device lightweight (<20g for the hedgehog) and extend the battery life. This will require smart component selection, and some intelligent programming to determine when/if to switch on the more power hungry components such as GPS and radio modules.

If you have any interest in this project please get in touch! The aim is to build a device over the next couple of months and conduct a trial in Regent's Park in March/April.

Smarter car alarm

I can rarely park my van outside my house and so I end up parking on one of several nearby roads. Plenty of my neighbours do likewise - it is a common grumble! Car alarms are very effective at annoying the nearby residents, but hopeless at alerting the vehicle owner when the vehicle is parked out of earshot.

Reading has a comparably high rate of vehicle crime. One in 200 of vehicles were broken int in the past 12 months in the centre, worse in the outskirts.

So lots of car alarms going off, annoying lots of residents but only alerting a few vehicle owners. I propose a smarter car alarm - one that contacts me directly on my mobile phone if my vehicle alarm has gone off. One that pinpoints my vehicle location on a map so it can be tracked if it is stolen.

Anyone want to help?




Yes! - Alex Gibson, admg3d.com

LoraWAN triangulation Easter egg hunt

I think this is probably one for the mathematicians!

Being able to accurately locate the whereabouts of a device is potentially in reach with LoraWAN. GPS is fine if you have plenty of power and are outdoors, but LoraWAN is a low-power technology so the idea is that batteries last a very long time. GPS is power-hungry and so runs batteries down quickly. Same for positioning via wifi - power hungry.

The idea roughly (there is plenty of teccy detail online) is that if a device is in range of 3 or more gateways then it ought to be possible to triangulate its position, based on accurately measuring the different times the signal was received at the gateways.

I rather like the idea of setting up a test site, say Forbury Gardens, and hiding a handful of devices in it, and then trying to find them using the information collected by the gateways.

What do you think - is it a goer?