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energy wristband

helping children to learn about electrical energy in the home

matt-vennmatt venn
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  • Description
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  • Discussion 3
  • The 2015 Hackaday Prize
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  • matt-vennmatt venn

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energy monitoring 2015HackadayPrize BestProduct

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This project is submitted for

  • The 2015 Hackaday Prize

This project was created on 03/27/2015 and last updated 2 years ago.

Description

A wristband that tells you energy changes in your home. It connects via a Raspberry Pi computer to a base station like a 'current cost' or similar. When a change in energy usage occurs, the wristband vibrates and a small LED bargraph shows your current usage from 1 to 4.

Realtime energy use can be queried by pressing the button.

Project Logs
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  • UK Maker Faire 2015

    matt venn • 04/30/2015 at 09:05 • 0 comments

    Ross gave me back the wristband after a few months of testing. They'd made a nice case at DoES Liverpool (https://twitter.com/cheapjack/status/591216586276605952) that was based on some real energy data!

    I made a little test house so people could try turning on and off various appliances and feel the wristband in action.

    One of the problems I had at the start was very unreliable bluetooth communications. When I ran `hcitool lescan` I found hundreds of devices due to all the mobile phones nearby! Increasing the timeout used by `gattool` to 20 seconds improved reliability a lot.

    Some photos of the wristband project at the UK Maker Faire 2015 (https://plus.google.com/u/0/photos/109869064118515349190/albums/6142516349786315393)

    And I've updated the beta tester instructions with a nice picture of all the parts (https://github.com/mattvenn/energy-wristband/blob/master/docs/closed-beta.md)

  • UDP repeater - or increasing range

    matt venn • 03/27/2015 at 16:33 • 0 comments

    The main issue with the system is that bluetooth low energy just doesn't seem to have the range. I've tried extending range by hacking the aerial, but it doesn't make much difference.

    After putting the dongle on a usb extension cable at my parents the range got a lot better. I'm assuming that getting it further away from the wifi dongle (both at 2.4GHz) reduced interference and improved range.

    Strangely, doing the same thing in my (much smaller) flat - it didn't make much difference.

    So how to increase range. Well my laptop is on a fair amount, so while it's on why not use its bluetooth to pass the message on if the wristband is out of range from the pi?

    If the daemon is started with --udp_repeat then it will broadcast any wristband messages (default 192.168.0.255).

    The udp repeater program can be started at boot, and will pass on messages received over UDP to the wristband if it's in range.

  • old logs

    matt venn • 03/27/2015 at 16:32 • 0 comments

    Older log posts are here https://github.com/mattvenn/energy-wristband/blob/master/docs/project_log.md

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peter jansen wrote 03/28/2015 at 01:48 • point

neat idea!

  Are you sure? yes | no

matt venn wrote 03/27/2015 at 20:33 • point

thanks!

  Are you sure? yes | no

zakqwy wrote 03/27/2015 at 17:18 • point

I love this--helping kids understand energy consumption at a young age is a great idea.

  Are you sure? yes | no

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