Other Parts Discussed in Thread: FDC2214
We are using FDC2214 EVM for measuring water level in a plastic container. Also the sensor PCB we used was TIDA00317: we used ;one channel per level sensor, ref air sensor and ref liquid sensor.The shield pins were not used as FDC2214 does not have active shield signals. The set up image shown will reveal this.
When we calculated water level as per the equation given,
level = href {(Clevel - Clevel0)/(Crl-Cre)}
the last column of the table shows the calculated water level in cm.
we are not able to calculate exact water level.
can you please look into the readings and suggest improvements so that we can measure exact water level.
Capacitance in pF | ||||
Actual water level | liquid sensor/Ch1 | Ref liquid/CH2 | Ref air/Ch 3 | Calculated water level in cm |
0cm | 27.27 | 24.19 | 27.4 | 34.83074766 |
1cm | 27.39 | 24.27 | 27.44 | 35.04615142 |
2cm | 27.5 | 24.3 | 27.47 | 35.15615142 |
3cm | 27.61 | 24.31 | 27.5 | 35.21815047 |
4cm | 27.74 | 24.31 | 27.53 | 35.27726708 |
5cm | 27.84 | 24.31 | 27.56 | 35.30769231 |
6cm | 27.93 | 24.31 | 27.58 | 35.35201835 |
7cm | 28.05 | 24.31 | 27.61 | 35.40454545 |
8cm | 28.13 | 24.32 | 27.63 | 35.46232628 |
9cm | 28.17 | 24.32 | 27.65 | 35.45828829 |
10cm | 28.2 | 24.32 | 27.7 | 35.38047337 |