Check the Remote Battery Periodically and Report to Low Battery Topic #244
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This will check the the battery voltage of compatible remotes at the most every 4 days. The length is a constant that could be changed easily. 4 days seemed reasonable. The battery is deemed to be low if it is below 3.4v. This is also a constant that can easily be changed. This uses the same low_battery topic from Battery Sensor
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I am trying to determine what the low battery voltage should be. I made a simple script that keeps querying the database trying to run out the battery. So far I estimate it has sent 10,000 messages and still appears to be about 3.55v. Once I have a good number this should be good to do as well. |
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3.4v seems like a reasonable low battery level. The device works down to at least 3.36v but the voltage seems to be dropping faster now, so it seems like this is the tail end of the curve. As an aside, these things really run for a long time on a single charge. The docs say 9-12 months. While testing this, I figure there have been 20,000+ messages sent from this device and I have kept it awake for many hours now in order to drain it down. The self discharge rate of Li-Ion is very good, so I would guess that a infrequently used device could last years, even a frequently used one probably lasts much longer than a year. |
This requires merging #240 first.
This is a new feature which will check the battery level for 2342-xxx remotes at most once every 4 days. The device is generally asleep, so the message is sent just after receiving a message from the device when it is awake. This means you will not get battery warnings from devices that you do not use.
If the battery voltage is low, a message will be emitted to the Low_Battery topic.
Closes #49