Silicon Laboratories IRSLIDER2EK Si1142 User Manual

S i 11 4 2 I R S
1. Kit Contents
The Si1142 Slider Demo Kit contains the following items:
 Si1142 Slider Demo Board

Si1142 Slider Demo Board Quick Start Guide
 USB Cable
2. Introduction
The Si1142 Slider Demo Board implements an infrared touchless slider function based around the Si1142 infrared
proximity and ambient light sensor. As shown in Figure 1, the main components of the board are the Si1142 sensor
(U2), the C8051F800 microcontroller (U1), and two infrared emitters (DS1 and DS2). Hardware is also provided
on-board to facilitate code development for the C8051F800 and communications with software support packages
over a USB interface.
The firmware running on the C8051F800 measures the infrared light energy detected by the Si1142, while each of
the two infrared emitters are independently activated. The infrared light from these emitters will be reflected back to
the Si1142 by any object that is placed in proximity to the board. The left-right position is then calculated from these
two measurements and used to illuminate the appropriate signal LED. If no object is close enough to the board, the
measured signal levels will fall below pre-determined thresholds, and no signal LEDs will be illuminated. In addition
to indicating the current position, the firmware is also able to detect different gestures from the infrared sensor, as
described in Table 2 on page 9. The Si1142's ambient light sensor (ALS) is also monitored by the firmware, which
can determine the amount of ambient light present.
Note: The touchless infrared position and gesture detection implemented in the example is patent pending.
Si1142-EB
Rev. 0.2 1/11
Downloaded from Elcodis.com electronic components distributor
S i 114 2 I n f r a r e d S l i d e r D e m o K i t
2 E K D
LIDER
DS1
U2
Figure 1. Si1142 Slider Demo Board
Copyright © 2011 by Silicon Laboratories
K U
EM O IT SER
SILICON LABS
www.silabs.com
DS2
' G
S UIDE
DS10
+5V_IN
P1
U3
U1
F326
F800
Si1142 Infrared Slider Demo Kit