Using the WeMo and an FO without batteries is something I hadn't considered
and seems kinda cute, especially with the IFTTT hack.
I wonder if doing a timed shutdown of the Pi periodically, followed by a
timed reset of the WeMo (off then on), which would reset the FO, would help
prevent the lockups -- on the theory that one happens *eventually* if left
However, this presumably wouldn't prevent data loss in the event of an
unplanned outage, which an FO with batteries *can* do. I also have
occasional power outages and what usually happens is that the Pi catches up
the buffered data. I keep
directories in a RAM disk to save SD card I/O and have had no SD card
issues at all.
On Thursday, September 15, 2016 at 7:22:45 PM UTC+1, George Alexander wrote:
> i have got a WeMo switch that is plugged into the wall, and then the power
> for the Pi is plugged into that. At any stage that I notice the FO has
> locked up, I can remotely cycle the power, and everything is reset - so far
> it has been working a treat.
> In order to make it work successfully though, the wiring gets a little bit
> messy. From the WeMo, power goes into an external hard-drive, usb
> all-in-one caddy. From one of the usb outputs is power to the Pi, from
> another is power to the FO unit. The FO unit has no batteries in it, so
> when the power is recycled, it will reset. Yes, this means that the time is
> always wrong on it as well as other settings, but that becomes irrelevant
> when reading it with weewx anyway. The usb caddy is also connected to the
> Pi via its data port, so the Pi can read the caddy. There is a 2.5" laptop
> drive also in the caddy, when the Pi initially boots it hands over the the
> HD to prevent wear and tear on the SD card.
> One of the issues I have found, is that the WeMo device remains "off" if
> there is a power cut. We have a few of those where I live. Yeah, I could go
> down the route of a UPS, but it's a little excessive for something that's
> not really mission critical. The solution I found was an IFTT recipe. It
> checks if the WeMo power is on, and if not, turns it on - it works in
> This got me to wondering if I could make another IFTT recipe - on that
> checked if the Pi had read th FO in the last say, ten minutes, and if not,
> turned the WeMo off. The first recipe would then turn it back on again and
> presto, we're up and running again. More thought and research is require
> for that one though.
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