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1、精選優(yōu)質(zhì)文檔-傾情為你奉上Automatic fire alarm system based on MCUAbstract: The paper introduced an automatic warehouse fire a1arm system based on MCU. The system was mainly made up of ATmega16, temperature sensors, smoke sensors, and EX-1 auto dialed alarm module. In the system, temperature signals were transfo

2、rmed to serial data, and smoke signals were transformed to voltage signals. All the data were processed by MCU. When the surveillance system checked fire in warehouse, alarm signal was turn on, meanwhile the messages were transmitted to managers through EX-1. Application of the system was convenient

3、 to deal with fire in-time, efficiently by warehouse manager.Keywords: fire alarm transducer;smoke sensor system;ATmega16;temperature transducer;smoke sensorI. INTRODUCTION Automatic fire alarm control system has experienced a process from the simple to the complex and intelligence system increasing

4、ly in China. The characteristic is automatic fire detection and alarm technology has a great progress along with computing and detection technology development. At present, automatic fire alarm control system was used in bulk storage plant, shopping malls, high-level office buildings, hotels and oth

5、er places. They were used in a number of collections focused on one area of intelligent alarm control method with higher levels of bus-type alarm control system, and in some residential areas and commercial buildings were installed by a single automatic fire alarm detection device. These alarm detec

6、tion devices fail to report sometimes, or misinformation. Its reliability is not high because of using single sensor. Therefore, it is needed to develop a simple structure, low cost, high reliability, fast responding, automatic fire detection system. II. GENERAL PROJECT OF THE SYSTEM The hardware bl

7、ock diagram shown in Figure 1, hardware by temperature sensors, smoke sensors, signal processing module, MCU modules and automatic alarm module. Non electrical quantity that is through the sensing element sensors (smoke sensors and temperature sensors) will be on-site temperature, smoke and other no

8、n-electrical signal into an electrical signal, as well as signals for signal processing to convert analog quantity to digital quantity. Finally, the sampled data were processed and compared with the limits by MCU system. This system can produce local and remote auto-alarm signals. Temperature Ioniza

9、tion Transducer smoke detector signal processingPD0 PD1SCMauto alarm module T ephoneelInter f ace Figure 1. Automatic fire alarm system structure. THE HARDWARE COMPONENTSA. Atmega16The system used by the U.S. Atmels microcontroller ATmega16 microcontroller. ATmega16 is based on the AVR RISC architec

10、ture to enhance low-power 8-bit CMOS microcontroller. Because of its advanced instruction set and a single clock cycle instruction execution time, ATmega16 data throughput of up to 1 MIPS / MHz. Thereby mitigate the system in the power and the contradiction between the processing rate. ATmega16 has

11、the following characteristics: 16K bytes in-system programmable Flash (with the ability to read and write at the same time, that is, RWW), 512 bytes EEPROM, 1K bytes SRAM, 32 general-purpose I / O port lines, 32 general-purpose working registers, for the JTAG boundary scan interface, support the on-

12、chip debugging and programming, 3 has a more flexible mode of timer / counter (T / C), chip internal / external interrupts, programmable serial USART, there are initial conditions detector universal serial interface, 8-channel 10-bit with optional differential input stage programmable gain (TQFP pac

13、kage) of the ADC, with on-chip oscillator of programmable watchdog timer, an SPI serial port, as well as six can be selected by software power-saving mode.The chip is based on Atmel high-density nonvolatile memory technology production on-chip ISP Flash allows the program memory through the ISP seri

14、al interface or a general-purpose programmer for programming; you can also run on the AVR core among the bootstrap to program. Boot program can use any interface to download the application to the Flash memory area (Application Flash Memory). Application of Flash storage area is updated when the boo

15、t Flash area (Boot Flash Memory) program continues to run, RWW operation achieved. ATmega16 to become a powerful microcontroller by 8-bit RISC CPU and the system programmable flash in a single chip, for many embedded control applications provides a flexible and cost-effective solution. ATmega16 has a set of programming and system development tools, including: C language compiler, macro assembler, program debugger / software emulator, emulators an