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PSoC 4

li09c_3970351
New Contributor

Hi Expert,

  We use your PSOC4 Capsense make a product for liquid level check, we found the the test is not good when the plastic box wall is bigger than 2mm thick. There are only 0.5% rate of  ADC value changed. But for little thickness(<0.5mm), there are 10% change rate of ADC value .

    We have below questions?

1. What is the max thickness of plastic box wall for this Capsense liquid level test.

2. Can we get a design to satisfy this bigger thickness liquid level test with tuning the Capsense sensor pad bigger or other trick?

CY8C4246AZQ-M443 + Capsense CSD mode.

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1 Solution
BrandonP_16
Employee

Hi,

As your comments "0.5% rate of  ADC value changed" and "14bits resolution", is rawcount changed with liquid around 82 counts?

If possible, I suggest you to make GND pad in the liquid. It could increase the signal.

Thanks,

Brandon

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3 Replies
Vison_Zhang
Moderator
Moderator

When you say ''ADC value', do you mean the rawdata of sensor?

How much scan-resolution of the sensors when you test thick plastic box?

How big size each sensor is?

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li09c_3970351
New Contributor

Thanks VisonZ,  yes ADC value means rawdata of sensor at 14bits resolution.

below is the pad size:

pastedImage_1.png

pastedImage_2.png

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BrandonP_16
Employee

Hi,

As your comments "0.5% rate of  ADC value changed" and "14bits resolution", is rawcount changed with liquid around 82 counts?

If possible, I suggest you to make GND pad in the liquid. It could increase the signal.

Thanks,

Brandon

View solution in original post

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