Distance and Weight Measurement Using Inductive Sensing Reference Design

Sho Ogane

Other Parts Discussed in Thread: TIDA-00215

Hi all.

I would like to know about Weight measurement using inductive sensing.
I see this TI design(TIDA-00215) can measure weight 605g~650g by calibration sensor output from microcontroller.

I understand this design use the distance between coil and magnet.
If I use expansion and contraction of the spring, could I measure weight human body weight,
if you know the such use case, please tell me it.

I am waiting your advice.

Best Regards,
Sho Ogane

over 9 years ago

0 Chris Oberhauser66 over 9 years ago

TI__Genius 14270 points

Hello,

The LDC is quite versatile, and is able to measure the expansion and contraction of a spring. You can use the LDC tools spreadsheet (www.ti.com/.../slyc137) to estimate the change in inductance of the spring; however you will need to ensure that the mechanicals design meets the system requirements.

Regards,

ChrisO

0 Sho Ogane over 9 years ago in reply to Chris Oberhauser66

Genius 5575 points

Hi Chris san.

Thank you for your reply and attaching calculation sheet .
I will use this sheet for the customer support.
I would like to know the application example which the LDC seriese is used as the weight scale measuring tool.
Do you know such application example?

Best Regards,
Sho Ogane

0 Sho Ogane over 9 years ago in reply to Sho Ogane

Genius 5575 points

Hi Chris san

I am waiting your reply.

Best Regards,
SHo Ogane

0 Chris Oberhauser66 over 9 years ago in reply to Sho Ogane

TI__Genius 14270 points

Hello Sho-san,

Are you interested in TIDA-00215 (www.ti.com/.../tidu367.pdf)?

Regards,

ChrisO

0 Sho Ogane over 9 years ago in reply to Chris Oberhauser66

Genius 5575 points

Hi Chris san

Thank you for the reply.

Yes, I am interested in this TI design.
I understood that this tool device use the distance of the coil and the plate.

Does this tool use expansion and contraction of spring?

Best Regards,
Sho Ogane

0 Chris Oberhauser66 over 9 years ago in reply to Sho Ogane

TI__Genius 14270 points

Hello Sho-san,

Yes.

0 Torgeir Skomedal over 9 years ago in reply to Chris Oberhauser66

Prodigy 195 points

Figure 27 and 28 clearly show coils on PCB. I cant understand that the inductance of the springs are used.

Regards Torgeir

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Distance and Weight Measurement Using Inductive Sensing Reference Design