On 17/07/15 18:13, Adam Bower wrote:
On Fri, Jul 17, 2015 at 04:24:05PM +0100, Chris Walker wrote:
Mark Rogers mark@more-solutions.co.uk wrote:
Background: A couple of times I've had my garage freezer defrost. I'm pretty sure it's not failed, just that the door isn't properly shut,
Surely you're monitoring the effect rather than the cause. If the cause is that the door is left open, monitor the door! It would also be much simpler to do.
I'd suggest that the thing you *really* want to monitor is neither the door or the power. If there is some doubt about what the problem is you want to measure the temperature (and probably the door and power too).
I would suggest the really easy way to do this is get a computer, get a temp sensor, get some kind of energy monitor and something that can read open/shut for the door and graph it all with a tool like munin or nagios and then set some alerts on that if you really want.
Adam
Not sure if it's the simplest way, but there's a Pi based project called Open Energy Monitor. This can monitor power usage, and it can also monitor temperature too. http://openenergymonitor.org/emon/
Any use?
Cheers Steve