At our home we often experience voltage fluctuation on our electricity supply with multiple surges.
(Not just us – It happens to the whole of the street)
The consequence of this is that the RCD on our main fuse board often ‘trips’ knocking all our sockets off (The RCD is unfortunately now a legal requirement in the UK)
This tripping is not a problem when we are at home – a quick trip to the garage to reset the RCD doesn’t take long (although resetting all the digital clocks is a pain – I need to replace them with battery backup ones)
All my computers, SmartThings, network routers/firewalls etc. are covered by about 6 hours of UPS backup so short term blackouts are not an issue and we often lose power completely for 2-3 hours at a time
However; when we are not at home a tripped RCD could be disastrous, obviously problems with defrosted food and loss of UPS power after 6 hours etc.
Luckily we have a good friend who is happy to make the short journey to our home to reset the RCD if it trips when we are on holiday etc.
The problem I had, is when to know it has tripped so I can ask our friend to reset it.
Initially I looked at getting the UPS to send an email when on battery power but this was not too reliable as we might not have reliable internet connections on holiday.
Sending a direct email to a guy (our friend) who looks at his emails once a week is not too reliable either. He does always carry his phone with him though
So I came up with this little idea.
It’s very simple really and uses the facility that Fibaro Door sensor has to send open/close to smartthings when an external contact closes
Power Monitoring V1.0
This is what I’m proposing…
Mount this all in a box with a 3-pin plug on a lead to plug into mains
- 240v ac relay to hold N/C connection open when power is present
- Cable & a plug to connect to mains
- Fibaro door sensor connected to relay (used WITHOUT the magnet)
- Send message/sms when door sensor changes to open or close
If power goes off then relay closes and turns on/off Fibaro door sensor (which retains its battery power) – thus allowing SmartThings to send a push message when the status of the door sensor changes.
A quick little SmartApp (or standard “Notify Me When” SmartApp) to alert me when power is off – Problem Solved!