Smart scale for small weight loads?

Hey Everyone!

I’m looking to track the current tank capacity of a bedroom humidifier with a small smart scale so that I know when it is close to being empty. I’ve seen projects that do this for larger out-of-sight weights (propane tanks, etc.), but I was wondering if you had any suggestions for smaller loads while in sight (the scale is not ugly).

Thanks for being awesome!


Have you looked at hacking the Amazon smart scale?


It is my understanding that regular body weight scales take a measurement and then “sleep” until stepped on again. I would need a scale that takes incremental measurements (every 30 seconds or so).

Do you have a link to the scale and the hack instructions? I haven’t found that one yet.

Thank you for the suggestion!

How about hooking up a film pressure sensor to an esp32?
Something like this
or this:

Hey @Edwin_D,


The pressure membrane looks elegant but has a low weight capacity (max 1kg). I’m guessing my humidifier has a capacity of a gallon which would put it well over weight.

The micro load cell looks more durable and should handle the weight. Would that sensor be in a general kitchen scale like this one? I could then yank the guts and hook it together with an ESP32 module to do constant measurements. Is this what you were referring to, @potts-mike? A link to some similar project instructions would be very helpful if anyone has created them.

Thanks again for your suggestions!!

I just picked a random membrane, I think there are ones for all kinds of loads, but the other one is exactly like what is used in kitchen scales.

Check this guy:

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This is what I was thinking of. I thought I saw on here someone that had replaced the guts with an esp32

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How to do that is here:

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Aw yiss! That’s what I was going for!!

I’ll pick one up and see what I can do with it. (Too bad the scale went from $15 to $20)

Thanks again for being awesome!!