Kitchen weight sensor

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Grossel

Well-Known Member
Hi.

I have a kitchen weight where only the display is broken. So I have decided to find out how to make use of the sensor itself.

The censor have four wires conected to it, different colors. So I guess that it might work same way as hall censors, but doesn't know.

Plan is to use a breadboard and a circuit that can turn on a LED when the weight goes over a certain value. I can always adjust with a potmeter, so any curves isn't neccesary. Just to prove it works.

Question is: How to determine what is input and what is output wires from this weight censor?
The weight is not pilled apart so I haven't measured any resistance between wires yet.

blueroomelectronics

Well-Known Member
A photo or part number might help.

ericgibbs

Well-Known Member
Hi.

I have a kitchen weight where only the display is broken. So I have decided to find out how to make use of the sensor itself.

The censor have four wires conected to it, different colors. So I guess that it might work same way as hall censors, but doesn't know.

Plan is to use a breadboard and a circuit that can turn on a LED when the weight goes over a certain value. I can always adjust with a potmeter, so any curves isn't neccesary. Just to prove it works.

Question is: How to determine what is input and what is output wires from this weight censor?
The weight is not pilled apart so I haven't measured any resistance between wires yet.

hi,
Look at this pdf, to be sure, we need more information regarding the cell.

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Grossel

Well-Known Member
hi,
Look at this pdf, to be sure, we need more information regarding the cell.
Thanks, I'll try this.

btw: It might take more than two weeks before I get time to check this out. Exept for some resistance values, I suppose the principle is the same.

tytower

Banned
Oatley Electronics sell an experimental load cell kit pretty cheap Oatley Electronics

I bought one and followed the pdf and it works great.
It has a chip on the side of a drilled out aluminium bar.Runs on 2.5V.everything included bar the top & bottom plates.

I recommend it .Fun There should be one available in Europe

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Grossel

Well-Known Member
I've read the pdf and the censor is a load cell type shear beam. I still can't provide more info yet, but I will.

Grossel

Well-Known Member
Here's a picture of the sencor.

As you can se there is four wires, Black, red, white and green.

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Vikky

New Member
hi,

Recently i have build a force sensor using the laod cell. Here i am displaying output in Newton. The 100 grm weight show 0.9 N. Even i can detect a change in 20 grm.

For this i have used INA326 instrumentation amplfier from TI. If it is available near you try to use it since the load cell output voltage change is very very less (in terms of uV), and you require a highly stable amplifier to detect the signal.

Grossel

Well-Known Member
Solved

Hi. This weekend I managed to measure the voltages on the load cell while it's still connected to the circuitry (not pilled apart yet).

I can confirm that the color on the wires is correct.

However I measured the voltage difference (green/white wire) and it's very low voltage variation. Even one kilogram makes a voltage difference of only 0.4 mV.

This case is solved. Thank you.

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