I use a wheelchair that can tilt back 50 degrees, which is awesome, except that on more than one occasion I've tilted all the way back and mindlessly removed my hand from the joystick, at which point I didn't have the strength to reach the joystick (or my iPhone, mounted right next to it) and have gotten stuck till someone found me! (Injuring my pride more than anything.)

So I'd like to have a Control Page with a button I have to push every 45 minutes (less, actually) - if 45 minutes goes by without me pushing it, and presumably resetting a variable, emails will be sent to my care team (actually, eventually I plan to hack my LifeLine alert switch with an I/o Linc, but emails are cool for now).

I've tried a couple of ways of measuring time, but so far no luck. Any thoughts?

The user contribution library contains a timer script that works great for my uses. Seems like it might be what you're seeking:

http://www.perceptiveautomation.com/fil ... .php?id=98

That timer script is one way of doing it.

Seems like you could do it with a couple of pieces:

• A schedule that decrements a variable once a minute.
• A trigger that fires when said variable gets to 0 that sends the email. That trigger can also reset the variable to something smaller (maybe like 5) so that when the variable again decrements to 0 again it sends another email - kinda of a pester function.
• An action on the control page that resets the variable to 45 when touched.

Of course you would also want to have actions on the control page to enable/disable the first trigger above - so it wouldn't go off while you're asleep for instance. But I think you get the point.

There is something like this example in the wiki, like if the garage door is left open for 30+ minutes, I get a text message telling me at what time it was opened every 30 minutes until it is closed. There is also an example alerting me with a text message if it is still open by 11PM.