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meichthys / window_sensors

Insanely Cheap Wireless Window/Door Sensors
MIT License
75 stars 2 forks source link

How often can you open the window before recharge? #1

Closed filipre closed 4 years ago

filipre commented 4 years ago

Hi,

First of all, nice project!

According to your Reddit post you said that the sensor will last for about a year. However, I was wondering how long it will last in terms of "opening and closing" your window. The related video said that the "3V Lithium CR2032 Batteries " will power the device for about 20 openings but you are using a 3.7V battery with higher capacity so I assume it will be a bit higher. Do you have some data on that?

Also, I was wondering whether there exists a better solution to make it last longer. In Germany, we open the windows at least once a day so recharging the battery every 15 - 20 days is quite a lot.

Best!

meichthys commented 4 years ago

@filipre Thanks, As for the battery life, most of my windows are still on the second charge so it appears that i'm getting close to 6 months on a charge. That being said, i only open my windows about once a week, so in your use case you might get closer to 2 months, but that's just a guess.

On a side note, if you do decide to get the batteries that i linked to, they may slightly expand after a few months or after recharging. I used a very fine pin and pricked a very small hole in the very outside sheath to prevent the battery from bulging further (This only happened on a few of the batteries, so it could have just been a slight defect in manufacturing).

In the future i'd like to add to the project a small charging station for the batteries (Currently i just use aligator clips to charge them, but it would be nice to just have a small station that i can swap batteries in and out as needed.

filipre commented 4 years ago

I see, thank you!