UM10505
OM11057 quick start guide
Rev. 2 — 10 April 2013
User manual
Document information
Info
Keywords
Abstract
Content
Capacitive switch, sensor, proximity switch, OM11057, PCF8885,
PCA8885, PCA8886, evaluation board
The OM11057 is an evaluation board which can be used to demonstrate
and evaluate the PCA8886 and PCF8885
capacitive touch and
proximity sensors
. The board can be powered by using a Mini USB cable
or battery.
NXP Semiconductors
UM10505
OM11057 quick start guide
Revision history
Rev
v.2
v.1
Date
20130410
20120402
Description
revised user manual
new user manual, first revision
Contact information
For more information, please visit:
http://www.nxp.com
For sales office addresses, please send an email to:
salesaddresses@nxp.com
UM10505
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
User manual
Rev. 2 — 10 April 2013
2 of 17
NXP Semiconductors
UM10505
OM11057 quick start guide
1. Introduction
The purpose of this board is to demonstrate the capabilities of NXP’s 8-channel touch
sensor PCF8885 to implement buttons, switch wheels and sliders as well as proximity
sensing with the dual channel PCA8886.
Features:
•
Demonstration of the dual channel proximity sensor to wake up the board, one
channel reserved for external sensor pad
•
Demonstration of an interface with 4 buttons, a switch wheel and a slider by using an
8-channel sensor circuit in multiplexed mode
•
•
•
•
•
•
•
•
•
•
Enables touch sensitivity through 3 mm acrylic overlay plate
Works stand alone
Can be powered either with 2 AA-batteries or via USB
Feedback with a piezoelectric sounder
Feedback with RGB diodes
Software can be modified using LPC-link
Low-cost Cortex-M0 LPC1114 controller board with 32 kB Flash Memory
PCF8885, 8-channel capacitive sensor
PCA8886, 2-channel proximity sensor. One channel reserved for external sensor
PCF8536 LCD/LED driver
Remark:
The physical properties of any touch experiment are determined by different factors.
These factors are:
•
Size of touching entity (single finger, several fingers, palm … hand)
•
Speed of approaching object
•
Environmental properties like humidity, contamination
By default, the board is configured to:
•
Accept a ‘typical human touch’,
too fast and too slow movements are screened
out,
No fly or turtle will be detected
•
As a push-button. If you just touch it slightly, as it would be hot, the capacitance
formed by the finger and the sensor area will be to small (just a few mm
2
) and
will not be recognized as a touch
The demo board should be put on a desk and not touched on the bottom side as
this would short circuit the sensor inputs and cause false switching!
UM10505
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
User manual
Rev. 2 — 10 April 2013
3 of 17
NXP Semiconductors
UM10505
OM11057 quick start guide
2. Quick start
•
The demo board is powered up with the power switch
•
When the power is turned on, a start-up animation will be shown and the board will be
set in RGB (Red-Green-Blue) mode. This enables the user to obtain a mixture of red,
green and blue with varying intensity of each color.
•
A touch on the color selection buttons should be centered on the graphical icon
•
The sampling frequency is optimized for a human touch, which means that very quick
or slow touches will be ignored
•
For switching between RGB, RED, GREEN and BLUE mode, press the appropriate
button (the display will show RGB channels, RED channel, …)
•
In RGB mode, the control is similar to the living color lamp from Philips. By using the
switch wheel, the LCD backlight will sweep through the entire light spectrum, and the
slider will do the same for the control panel lighting. In RGB mode, there is no end and
no beginning, so the wheel can be turned indefinitely in both directions (same
principle for the slider). After a certain time, you will end up at the same color of
course.
•
When navigating in the RGB mode, if one of the colors RED, GREEN or BLUE is
chosen, the scroll wheel and the slider will only affect the intensity of the color chosen
in the mixture.
•
If the board is not touched for 20 seconds, it will switch to sleep mode. The LEDs and
the LCDs are switched off and a little red LED is switched on to indicate that the board
is in sleep mode. In order to wake up the board, approach the board with your hand.
The status of the board will be the same as before sleep mode
connector for external
interaction boards
color
selection
R22, R23
power ON/OFF switch
power source switch
switch wheel
proximity
sensor pad
slider
PCA8886
Fig 1.
UM10505
OM11057, top view
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
User manual
Rev. 2 — 10 April 2013
4 of 17
NXP Semiconductors
UM10505
OM11057 quick start guide
CPC
capacitors
PCF8885
Fig 2.
OM11057, bottom view
UM10505
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
User manual
Rev. 2 — 10 April 2013
5 of 17
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