CY8CKIT-014 Cypress Semiconductor Corp, CY8CKIT-014 Datasheet - Page 30

• Manufacturer Part Number: CY8CKIT-014
• Description: KIT DEV PSOC5 FIRST TOUCH
• Manufacturer: Cypress Semiconductor Corp
• Series: PSoC® 5, FirstTouch™r
• Type: MCUr

Specifications of CY8CKIT-014

• Contents: Board, Battery, Cable, CD, Documentation, Wire
• Processor To Be Evaluated: CY8C5588AXI
• Processor Series: CY8C55
• Interface Type: USB
• Operating Supply Voltage: 9 V
• Silicon Manufacturer: Cypress
• Core Architecture: PSoC
• Silicon Family Name: PSoC
• Kit Contents: Board, CD, Cable
• Features: Programmable System-on-chip Design Methodology And Architecture
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: CY8C55
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 428-3039

Example Projects
4.5.1
30
How the Proximity Sensor Project Works
Proximity detection is performed by a proximity antenna acting as a capacitive sensor. The proximity
antenna consists of a wire connected to the proximity connector on the board.
Upon power up, the board establishes a baseline capacitance value of the board along with the
antenna attached to it. This is used as a reference value of capacitance and is called the parasitic
capacitance of the board.
When a conductive object such as a human finger is brought close to the antenna, the overall
capacitance of the board changes. This change in capacitance determines the proximity of the finger
to the antenna. An increase in capacitance corresponds to the finger being closer to the antenna.
This is used to light up the LEDs based on the proximity of the finger to the antenna. The number of
LEDs turned on increases as the proximity of the finger increases.
To establish the parasitic capacitance, the antenna must be connected to the board before power up.
The baseline for capacitive sensors is updated continuously by the firmware. This accounts for any
changes in environmental conditions during the operation.
Figure 4-19. Proximity Sensor Project Flowchart
Scan the Proximity sensor
update LED display
Read signal value
Is sensor active?
Start
Boot
Yes
No
CY8CKIT-014 PSoC 5 FirstTouch Starter Kit Guide, Spec. # 001-57708 Rev. *A