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With the improvement of living standards, more and more people become the tourism as a kind of fashion consumption mode, and some questions also will produce, such as the lack of the guide and its quality is not high, together with a large number of like independent and free of tourists, the appearance of these prompted the electronic guide system production. Electronic guide system development of a process, the most began as a half automation system, the function is the spots in the audio file format information stored in a tour guide machine, usually by keyboard type attractions code, choose play. This type of tour guide machine, the shortcoming is to input attractions code, is not easy. Development up to now, there is a whole automation guide machine, it was laid in spots first wireless transmitting module, the launch module can be ?
2. MiniC-A101FS and SC2272 introduction
2.1 miniC-A101FS
MiniC-A100FS is the speech of the serial port control module, the use of simple, flexible and extended performance is high. This module provides not only the rich serial order is used to control the voice module play, also can provide inquires place machine up command. The characteristics are as follows:
A support MPEG1/2/2.5 layer3 MP3 format to MP3,
A support USB2.0, through the USB interface update music;
Provide a serial port control;
A support Flash capacity range: 0 ~ 1024 MB;
A support SD card.
2.2 SC2272
SC2272 and SC2262 supporting the use. They are using CMOS process manufacturing, most have 12 address pin, can support as many as 531441 address coding, thus greatly reduced the code of the conflict. SC2262 complete launch, send out SC2262 current address code and data bits of data. When SC2272 and SC2262 address consistent ?
3. Electronic guide system of circuit and system structure
In the design of the system, rf modules are distributed in the scenic spot launch of the spots, they work in different addressing signal. Electronic guide machine adopts the most common 51 series single chip microcomputer AT89C2051 as system control processing unit, use P1 mouth cycle to decoder chip SC2272 send 00 H ~ FFH data, as their address; At the same time, rf receive head J04P will received signals sent to the SC2272 decoding, if decoding of signal and single chip microcomputer to address the default signal consistent, would trigger interrupt INT1, into the interrupt handling procedure, in interrupt handling the subroutine, will be in the corresponding interrupt handling procedures playback. TXD will be used to and voice module serial communication, P3 mouth the INT1 for interrupt. The launch system function
SC2272 decoding out of default and address address consistent, VT feet would jump from the low level of high level, the signal to send inverter to take after the trigger, interrupt INT1; Interrupt control procedure through the RXD, TXD speech broadcast to send command module "2404010000", and speech broadcast module began to play scenic spot introduction. As shown in figure 2 shows system circuit.
Figure 2 have three buttons, and 2 is sound size keys, another one is reset button. Sound size keys using "sampling differences voltage" principle, is played to own key speech module circuit; And the reset button to used the classic circuit, SCM reset and voice played module reset together, work together.
In order to enhance anti-jamming effect, will J04P perpendicular to the circuit board, and in on the drawing board should stay away from speech broadcast module has a certain distance, so that they can have the best anti-interference effect. SC2262 and SC2272 of the oscillation resistance choose 1 M Ω and 200 k Ω is the best.
The system also consider whether to finish the tape broadcast after repeated play. This design is the function of broadcast not repeat play, unless tourists press the reset button, it is through the software to realize. In the SCM
4. The field test
In order to check the reliability of electronic guide equipment, some field test, the effect is good: (1) launch module can be adjustable distance, accord with the need of the tourist attractions that, basically can through the control the length of the antenna and the voltage of the high and low get ideal distance; (2) the error possibility is extremely low; (3) through the control of the program is very good way to realize the automatic judgment the same attractions after play whether or not to play.
5. "language
The current market electronic guide system has the following defects: high cost, big volume and storage capacity small voice. In this paper, the tour guide system with the use of radio frequency the transmit/receive head F05P/J04P and decoding chips SC22262 / SC2272, with low power consumption of the single chip microcomputer AT89C2051 control module voice work, success reducing the volume (?
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