Cypress Semiconductor CapSense CY8CKIT-022, Manual, Page: 22 / 33

CY8CKIT-022 CapSense® Liquid Level Sensing Shield Kit Guide, Doc. #: 002-09825 Rev. ** 22
Kit Hardware
2.4.5 Temperature Compensation Sensor
RX12 sensor on the shield board provides the ability to measure and compensate for environmental effects such
as temperature on the liquid level sensors. Use of RX12 sensor for compensation is optional. RX12 is also
brought out to the sensor connector (J5-9) although the supplied kit sensors do not use RX12. User can add an
RX12 sensor connected to J5-9. In this case, resistor (R1) shown in
Figure 2-13 must be removed from the
Shield board to disconnect the onboard sensor.
Figure 2-13. Sensor RX12
2.4.6 Integration Capacitors
Two integration capacitors are provided to support CapSense Mutual-Capacitance Scanning
method.
Figure 2-14 shows the capacitors C
intA
on J2-1 and C
intB
on J2-3. The C
int
capacitors on
this shield can be used with Pioneer kits that do not natively support C
int
capacitors.
Figure 2-14. Integration Capacitors
Table 2-4. J4 Arduino Header
Pin No. Arduino Board Signal CY8CKIT-022 CY8CKIT-042
J4.1 D0 UART_RX P0.4
J4.2 D1 UART_TX P0.5
J4.3 D2

P0.7
J4.4 D3 RX11 P3.7
J4.5 D4 RX10 P0.0
J4.6 D5 RX9 P3.5
J4.7 D6 RX8 P1.0
J4.8 D7 RX7 P2.7