Capsense Proximity Sensing Demonstration - Cypress PSoC FirstTouch CY3270 Manual

Getting Started
2.4.4

CapSense Proximity Sensing Demonstration

The CapSense proximity sensing demonstration shows how to use a proximity sensor to control
LED color.
The proximity detector requires the use of a Proximity Antenna and can sense an object with approx-
imately 2–3 inches of range. In the FirstTouch Kit, this sense antenna is formed by attaching the pro-
vided wire into the pin socket labeled PRX1 as shown in
the FTMF will establish a baseline reading of the Proximity Antenna. It is therefore necessary to con-
nect the Proximity Antenna prior to plugging in the FirstTouch kit.
The project is setup to recalculate this baseline approximately every 30 seconds. Also notice how
the shape and position of the wire affects the demonstration operation and the proximity sensing dis-
tance.
Follow the CapSense Touch Sensing based guidelines in section
Card Demonstration Projects
CapSense proximity sensing demonstration. Slowly approach the CapSense proximity sensor
(depicted in
changes. Removing your fingers leads to the LED color slowly reverting back to its initial state. The
CY8C21434 PSoC that resides on the FTMF Expansion Card detects the relative proximity of your
fingers to the FTMF Expansion Card and controls the LEDs output.
12
Figure 2-5. CapSense Proximity Sensing Demo Schematic
to simulate, build, and program the FTMF Expansion Board with the
Figure 2-1 on page 8) with your fingers and notice how the color of the LED color
Figure 2-1 on page
CY3270 PSoC® FirstTouch Guide, Document # 001-15945 Rev. **
8. Note Upon power up,
2.5 Exploring the FTMF Expansion