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2025-02-15 23:52:17

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回答1：

Infrared receiver circuit
Design uses a high-performance infrared receiver - telefunken
Root TFMS5380. Telefunken developed micro-receiver TFMS5380 is the highest in the recent market performance of the infrared receiver. The same components have been installed on the receiving diode and preamplifier. TFMS5380 characteristics: (1) a single receiver and a combination of pre-amplifier. (2) ultra-sensitivity and transmission distance. (3) built-in PCM frequency filter. (4) without the need for external components. (5) special light and electric field interference shielding. (6) TTL and CMOS compatible for operation control of the microprocessor. (7) optional frequency from 30KHZ to 56KHZ. (8) low power consumption. (9) ISO9000 accreditation.
TFMS5380 applicable to data transmission, television sets, video recorders, music centers, and satellite receivers, etc.. TFMS5380 and constitute the internal block diagram of the receiving circuit. Shown in figure 3.

The request was receiving circuit to receive the infrared light wavelength of about 950μm, the pulse width modulation signal is not less than 600μs. TFMS5380 the application circuit is very simple. Experiments show, TFMS5380 good performance, fully meet the needs of data transmission. S3C2410 ARM9 development board 800 SOC development platform for the development of 360 luxury single-chip system board 498 yuan study of 138 single-chip wireless nRF-9E5 module 100 to develop 51 single-chip test board 238 Genius NSP Universal Programmer 260 yuan Mini ARM Debugger330 million LABTOOL-48UXP2800 million S3C2410 ARM9 development board 800
3. Software Design
The system software design includes hand-held meter reading devices and host software from the software side of watt-hour meters in two parts. During the design of hand-held meter reading devices accept single-chip microcomputer to send characters with the way the characters are inquiries, send communications read before the state register, send inquiries to maintain any register empty, receive communications read before the state register, a data query End has closed. Watt-hour meter single-chip approach using interrupted, that is, the address frame received after the application for the serial port interrupt, interrupt response, the interrupt service routine to enter.
Handheld meter reading software design:
In infrared communication, the handheld meter reading device as a host is the initiator of communication, the sending and receiving are active, and its specific work process: continuously scan the keyboard, if found to have the command key pressed, then call Send subroutine to send the corresponding command, sending soon start receiving end subroutine to receive return information watt-hour meter, and then docking received follow-up information processing. Hand-held meter reading devices, including communication program initialization subroutine and serial communication program, the process shown in Figure 4.
Subroutine to initialize SP-INIA, mainly on communications baud rate and mode settings, the program source code is as follows:
SP_INIA: MOV TMOD, # 20H; select Timer T1 mode 2, timer mode
MOV TH1, # 0E8H; preset time constant
MOV TL1, # 0E8H
CLR ET1; prohibited from time to time interrupted
SETB TR1; start timer
MOV PCON, # 80H; SMOD = 1
MOV SCON, # 0D8H; manner 3, SM2 = 0, REN = 1, TB8 = 1
SETB EA; open total interruption
SETB ES; open serial port interrupt
RET
Serial communication program meter reading slightly;
Watt-hour meter software design: watt-hour meter as a client from the machine, its software programs, including the main program and interrupt service routine, flow chart shown in Figure 5;
4. Concluding remarks
This article describes the application of watt-hour meter IR meter reading system in single-chip serial communication interface with the hardware circuit is simple, low-cost and easy programming, communications and high reliability. Use of hand-held meter reading devices can be easily completed the copy of the watt-hour meter and calibration work has greatly enhanced the efficiency of meter reading and meter reading accuracy and to eliminate the estimated high copy and the copy of the issue of misuse. In this paper, the communication protocol can be more than one single-chip transmit data securely, to achieve the communication of both non-contact transmission of data, can also be used for other remote control, remote sensing of single-chip applications.
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