I have 5 of these door sensors and I like them because they use a Hall effect sensor rather than a reed switch for sensing, and they seem very sensitive meaning I can have the magnet further away and the sensor will see it.
HOWEVER I am having a problem with the battery level being reported.
They seem to report NO MORE than 48% battery with NEW batteries.
So I measured the voltage at the battery holder while powering the sensor, and it was great! About 3.2 volts.
SO I tried an experiment, realizing that I might cook the sensor, but I wanted to test.
I connected a regulated bench supply to the battery contacts and increased the voltage until the reported battery was 100%.
That voltage was 4.35 volts.
I would imagine that the electronics are rated for 3.3 volts with a max of MAYBE 4.5, so 3 batteries might cook the sensor, so I didn't try for very long.
I wrote to 3rd reality to see what they have to say and am waiting for a response... we'll see.
I just like to monitor my battery devices to make sure they don't die without knowing, and things don't work.
What are others seeing as a battery level on these sensors?
