[SOLVED] SN-LLS Liquid Level Sensor

[robosang]

From the result you get and the calculation, you are doing the wrong assumption, wrong calculation. Who say the Rref is 1500? Did you measure it?

[wstay]

robosang;

from the datasheet
it saying the Reference resistance is 1500 +/- 10%
same with the Sensor Resistance when empty 1500 +/- 10% ;

From the simple voltage divider rule;I connect the Sensor resistance at bottom and the reference resistance at the top.
when i measuring the resistance; it is about 1600 Ohm

[robosang]

OK, good!

1600 Ohm is Rref or Rsense? Try measuring both when there is no water/liquid and it is full.

[wstay]

I think the etape sensor is faulty;
I cannot get any reading when measuring the resistance across Pin 2 and Pin 3; pin 1 and Pin 4.
I think i need to claim it.

Can I just ignore the reference resistor ? and i just connect the Sensor resistance?

[robosang]

I don know whether yo can claim or not, I am not Cytron.

You can try fill in the support form under support tab, their technical team might be able to help.

BTW, you can ignore the Rref, although I do not have the sensor, but from the diagram, you can do that. Also if you are getting changes on voltage, the sensor is working.