I’m looking for a zwave or zigbee low cost contact sensor (or similar) battery operated device that I could wire a pressure mat up to. Lots of US Zwave contact sensors with dry inputs but can find anything for purchase in the UK.
I have found that leak sensors are not designed to run on "contact closed" state for a long period of time. I think that they pass quite a high current to be able to close the contact using water and consequently run their battery flat very quicky when faced with a wired contact shorting out the leak detection.
Modifying door open / closed contacts is a better way of doing it.
You have a point for a pressure mat as you shouldn't be standing on it for very long. I used a modified water sensor on the relay controlling the "low temperature" lamp on my freezer and it only lasted 2 days before the battery ran flat. I found that using a modified door sensor was more reliable. for the pressure mat you could also use a modified push-button as this is effectively what the mat is, a very large push button.
My use case is to stick our wheelie bin on top of it and for it to notify us if the wheelie bin was still there on bin day that we hadn’t put it out for collection... not something I want to spend a huge sum on obviously However, it was my girlfriends suggestion and she’s not in to HA in any sort of way so could be the start of a positive sign
I ordered the water sensor as it was so cheap.. without reading the other posts but sounds like that could drain the battery quickly in my case... I wander if there is a way to “reverse” the operation of it ..
But as they have handles, any way you can stick a contact to something at the back of it? Presuming the bin backs onto something, or at floor level? Just need to find a sure way that the magnet wouldn't come off whilst being emptied, but at the end of the day it is just a magnet
He's also selling the contacts too.
Not sure why that shows at £21.91, I see £10 + £6 delivery.
But you have got me thinking about this.
Ours are bi-weekly, black bin one week, recycling bins the next, and I always forget which is day it is (black or Blue/Green). Then I have to go out front and see what the neighbours are doing lol.
So first step is trying to figure out a rule (piston in my case) which can tell me which day it is.
Once I can get that working, I'd like to do something along your lines, although we have 4, and as above I don't want to be replacing magnets all the time, although duct tape may be the cure there
Keep in mind any magnets work, you just need a strong one. I have these on my fridge to hold up kids papers and used one on my mailbox for a contact sensor to notify me that mail has arrived (I live in US). They are pretty flat and can be glued or taped to your bins. I don’t have experience with these exact ones and picked the first hit I could find on amazon. There are multiple choices for “rare earth magnets”.
I bought the Withings sleep sensor. It's awesome, although via IFTTT since no direct integration. The app is great too, Tracks sleep and provides useful stats. It goes under the mattress but is sensitive enough to pick up breathing, snoring etc. Very cool. Wouldn't use it as a bin sensor tho' lol