Battery life of the 1byone Driveway Alert Sensor system
This information would be good to know for anyone considering this system, but does not seem to be available. I measured two sensor samples as follows: - Standby (active): 25 uA max - Detect: 16.2 mA max for about 2 seconds It's not actually 16 mA for the full 2 seconds, but that's close enough. Especially since the 2 seconds might be anywhere from 1 to 3 seconds - I did not bother to measure more accurately than that. The sensors run on AAA cells, which I personally hate because of their relatively low capacity. But, running the numbers, the effective capacity of AAAs should run these sensors for a very long time. Assumptions: - Due to self-discharge and temperature effects, cells will only deliver 75% of their rated capacity. - I estimated alarm consumption at 16 mA for 4 seconds. This is twice as conservative as the ~2 seconds I estimated from observing the unit current. These work out as follows: Using 1000 mAh ...