Abstract—The paper presents a method
of designing an intelligent vehicle for distribution system. The voice order of
a human being operator can be recognized and transformed into digital
information by iFlytek Input, which is installed on theAndroid smartphones as a
mobile app. Moreover, based on the Bluetooth wireless communication technology,
the digital information about voice order can be transmitted to the intelligent
vehicle which is mainly made up of the Single Chip Microcomputer(SCM)
MSP430F169. Code Shoppy Finally, the SCM will deal with the received information and
acquire the key content to control Direct Current (DC) driving device, which
can actuate the DC motor to accomplish all kinds of basic distribution
assignments. Keywords-intelligent vehicle; single chip microcomputer; iFlytek
input; bluetooth; DC motor
ANALYSIS OF
THE SYSTEM ARCHITECTURE
For a distribution system, the
warehousing area consists of the waiting area and the shelves area, which is
displayed in the figure 1. The waiting area is used to park the intelligent
vehicles, and the shelves area stores the goods. The shelves area is divided
into six lines (A, B, C, D, E, F) and seven columns (1, 2, 3, 4, 5, 6, 7).
Then, there are 42 shelves, and each shelf has a unique code, namely, A1, A2,
......, A7, B1, B2, ......, B7, ......, F1, F2, ......, F7. The black line
shows the route of the smart vehicle from the waiting point to the black
objective shelve. The control system of the distribution system is composed of
the control terminal which deals with the speech recognition by the Android app
and the execution terminal which carries out the specific orders by the
intelligent vehicle. The control terminal can recognize the voice commands from
all kinds of operators, which will guide the execution terminal to complete the
distribution assignments. Furthermore, the working modes include the automatic
and manual mode. The automatic mode deals with the conventional path by the
vehicle itself, while the manual mode disposes the complex working situation by
the operator. Two kinds of patterns can be switched by the voice orders at any
time. Figure 1. The distribution area map In
the first place, the operator issues the speech orders through the control
terminal to confirm working mode. In the automatic mode, the operator will
continue to send voice commands of the objective shelf code to the vehicle.
According to the shelf code, the vehicle will automatically calculate and
scheme the distribution path, which will direct the vehicle to transport the
goods to the objective shelf. At last, the vehicle could discharge the goods
and return to the waiting area in terms of the original path. In the manual
mode, the operator can adjust the running path of the vehicle in real time by a
series of voice orders, such as "forward", "backward",
"left", "right", "stop" and so on. In order to
realize the function of the intelligent system, the hardware system of it must
be constructed firstly. And then each module type of the hardware system and
the specific circuit connection between them must be confirmed. Ultimately, the
design of the intelligent system will be finished based on the combination of
the software and hardware system.
THE
HARDWARE SYSTEM
The hardware system obtains and refines the voice
messages from the operator, outputs the distribution 2017 3rd IEEE International Conference on Computer and
Communications instructions to the DC motor and so
forth. The structure of the hardware system is shown in the figure 2. As shown
in the figure 2, the core controller is the Single Chip Microcomputer (SCM)
MSP430F169, which can obtain the digital speech information from iFlytek Input
by using the CC2541 chip of Bluetooth wireless communication module produced by
Texas Instruments (TI). The digital information will be processed furtherly to
get operational commands, which will be displayed on the LCD and be applied to
control the running of the DC motor. As displayed in the figure 2, the
hardware system is composed of iFlytek Input, the Bluetooth wireless
communication module, the LCD module, the driving module for DC motor, the
driving power, and the voltage converter. In the following sections, these
modules will be described in detail. A.iFlytek Input Speech recognition is the
process of refining speech signal and extracting its feature. The sound
collected by the voice sensor is chaotic, there's no rules to follow, so it
must be filtered out the noise and be amplified to extract the feature vector
sequences of speech. Furthermore, compared with the characteristic variable
sequence of the reference model library, the feature vector sequence can be
obtained by a specific retrieval algorithm and acoustic modeling method (such
as dynamic sequential structured method, artificial neural network and support
vector machine (SVM) method) [2][3]. Based on that recognition theory, iFlytek
Input provides a voice input mode, which can realize the voice recognition and
transformation. For this reason, iFlytek Input can be installed on the Android
smart phone to recognize and convert the original speech information [4].
As a
consequence, the handled information will be transmitted to the SCM MSP430F169
through Bluetooth wireless communications. B.Single Chip Microcomputer As the
core component of the whole hardware system, the SCM MSP430F169 collects all
kinds of input information, refine rough data and control the external
equipment. Texas instruments (TI) had introduced the low power consumption
microprocessor MSP430 series at the end of the twentieth century. As one member
of them, the SCM MSP430F169 has the advantage of strong capacity of handling
data, fast operation speed, high on-chip resources integration, low power
consumption, stable operation and flexible peripheral interface [5]. The SCM
MSP430F169 consists of many function modules: the 16-bit central processor CPU;
16-bit timer/counter B7 with seven kinds of capture Comparator; the timer A;
Direct memory access (DMA) controller; 12-bit AD/DA converter; Multiplier; All
kinds of memory (flash memory, random access memory, etc..); 6 separate 8-bit
parallel ports; Crystals and clock circuit; watchdog circuit and so on.
According to this structure, encapsulation of MSP430F169 is 64 pin, which can
be connected with all kinds of external interface components to realize the
interaction of information [6]. Therefore, connecting the Bluetooth wireless
transmission module, the SCM MSP430F169 will receive the recognized digital
information by means of serial communication. C.Bluetooth Wireless Communication
Bluetooth is a kind of wireless transmission technology standards, data can be
transmitted among the fixed hardware devices, mobile devices and Local Area
Network (LAN) in the short distance by using Bluetooth technology. Moreover,
Bluetooth protocol supports RS-232 serial data transmission standards [7].
