Cypress Semiconductor CY3280-MBR3 ユーザーズマニュアル

CY3280-MBR3 Evaluation Kit User Guide, Doc. #: 001-89905 Rev. *B

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Configuration Files and Example Projects

5.2.2

Proximity Detection

This configuration file configures the CY8CMBR3116 to demonstrate proximity detection, CapSense
buttons, LED brightness, and buzzer drive features.

1. Follow steps 1 to 4 as described in section 

.

2. Double-click the Proximity Detection.cprj file to open it.

3. Follow steps 6 to 9 as described in section 

 to continue.

4. Verify the following features:

a. CapSense buttons: Touch any CapSense button; the corresponding LED turns on, detecting 

your touch.

b. LED brightness feature (93 percent Active duty cycle and 7 percent Inactive duty cycle): The 

LEDs are driven by a pulse width modulator (PWM); the percentage of active and inactive 
duty cycles represent the PWM duty cycle for which the LEDs will be on. According to the con-
figuration settings, when none of the CapSense buttons are touched, the LEDs glow with a 
faint brightness with a PWM duty cycle of 7 percent. When a CapSense button is touched, the 
LED glows with higher brightness, with a PWM duty cycle of 93 percent.

c. Buzzer feature (1-kHz frequency and 1-second duration): Touch a CapSense button or prox-

imity loop; the respective LED turns on along with an audio feedback for 1 second at a 1-kHz 
frequency.

Figure 5-7.  LEDs with 7 Percent Inactive Duty Cycle