Proximity Sensor-based Remote Control Remote Control Demonstrator Board

 The Proximity Sensor-based Remote Control is an
example of advance universal remote control,
implementing Wireless 2.4 GHz connectivity,
proximity Sensors and an Accelerometer all in a
single application. This application note describes
the system solution, hardware, and software
designs.
The remote control presents several Freescale
devices and technologies: ZigBee® (SMAC)
capability, Accelerometer and proximity capacitive
sensing. The board is placed in a small, handy
plastic enclosure and is powered by two AAA
batteries.
Integrated into one package, the basic component
of this board is the 8-bit MC13213 MCU with a
HCS08 core and RF 802.15.4 modem, all
integrated into one package.
The remote controller includes a low-power 3-axis
accelerometer. The design is universal for the
assembly of the Analog MMA7340L or the digital
MMA7456L version of the Sensor Sensors are
modifiable to detect 2g/4g/8g sensitivities.
A contact-less user control Interface is realized by a
10-element electrode keyboard handled by Touch
Sensing Software and implemented in the
MC9S08QG8. An example of implementing an
E-Field Lighting Controller with Wireless
Connectivity is shown.
 A block diagram of the Proximity Sensor-based Remote Control application is shown in Figure 1.
The full Proximity Sensor-based Remote Control consists of the Main Control Board and a small
touch pad board, which are both connected together by a flat 5 double wire cable. The goal of
the Proximity Sensor-based Remote Control design is to provide a small, handy portable device
with the capability of demonstrating Freescale’s ZigBee® (SMAC) RF Communication devices,
Capacitive Touch Sensing Software, and 3-axis Accelerometer functions. The whole device and
the shape of the PCBs are designed for integration into a small plastic enclosure from the Ruwido
company. The Proximity Sensor-based Remote Control incorporates an internal 10-element
touch pad keyboard on the top side of the PCB. The device uses the front face from this plastic
enclosure as the covering material for these electrodes.There are three main components on the
back side of the PCB, connected together via the I
2C serial Interface on the board. The
application is powered from two 1.5 V AAA batteries and uses power down modes when the
device is not used by the user.
First, the MC13213 is an 8-bit MCU device with a HCS08 core and a RF 802.15.4 modem
integrated together on the chip. This device reads either the touches recognized by the
MC9S08QG8 MCU or the 3-axis angle information generated by the Accelerometer via the I
2C
bus, and it performs the relevant function. The device will indicate internal states by turning on a
relevant LED on the board, manage power down modes, or it may transmit data by a RF
communication modem with a controlled device.
Second, the 3-axis Accelerometer is implemented on the board. There is the possibility of
assembling either the digital MAA7456L or the Analog MAA7340L version of this Sensor The
digital version of the Sensor communicates with the MCU via the I
2C bus. The Analog version just
provides an Analog level for each axis, which is converted by the MCU ADC module. Sensors are
modifiable to detect 2g/4g/8g sensitivities.The PCB is universal for both versions of the Sensor
Third, there is a Capacitive Touch Sensing Software function in the MC9S08QG8 MCU, which is
based on the original Proximity Software Library provided by Freescale. This Touch Sensing
software has been especially adapted for this kind of application and for plastic materials. The
MC9S08QG08 is connected by the I
2C bus for sending information to the main MC13213.
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Block Diagram of Proximity Sensor-based Remote Control Application
Block Diagram of Proximity Sensor-based Remote Control Application



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