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Remote Alarm Monitor System Based On GSM and ARM


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Procedia Engineering
www.elsevier.com/locate/procedia

Procedia Engineering 00 (2

011) 15 (2011) 65 – 69 Procedia Engineering 000–000

Advanced in Control Engineeringand Information Science

Remote Alarm Monitor System Based On GSM and ARM
Zhijie Tanga,WangShuaib,Luojunc,a*
a b

School of Mechatronics Engineering and Automation, Shanghai University, Shanghai, China School of Mechatronics Engineering and Automation, Shanghai University, Shanghai, China c School of Mechatronics Engineering and Automation, Shanghai University, Shanghai, China

Abstract This paper presents a remote monitor and control alarm system based on GSM and ARM. This system uses ARMbased microcontroller LPC2368 as the MCU, a smoke sensor MQ-2 to detect the harmful gas, the temperature sensor DS18B20 to monitor the temperature, the humidity sensor HS1101 to check the humidity in the room. Also we use gate magnetic switch, we fix them on the door and windows to monitor the invasion. If the householder comes back, he can enter the password through the keyboard. The microcontroller then disables the alarm from the gate magnetic switch. Once the abnormal occurs, the MCU gets the alarm signal immediately, and the system controls the camera to take photos, and send multimedia messages (MMS) to inform the alarm information.

? 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of [CEIS 2011] Keywords: Real Time Monitor; Remote Alarm; MMS;

1. Introduction As the standard of living improves, people focus more on the home safety and the warehouse safety, and the demand of the protection on the gas leakage and the fire in the room higher and higher .The guard against theft is also the key aspect to consider. We introduce a remote monitor and control system [1] that contains temperature, humidity, smoke sensors to monitor the house. We also use gate magnetic switch to guard against housebreaking. Whenever the abnormal situations happen, the MCU control the camera to take photos and send MMS through GSM module [2] to the householder.

* Corresponding author. Tel.: +8621-56334137; fax: +8621-56334458 E-mail address: tangzhijie@shu.edu.cn.

1877-7058 ? 2011 Published by Elsevier Ltd. doi:10.1016/j.proeng.2011.08.014

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Compare with the tradition protection method using the buzzer alone, or only uses the camera to monitor, we uses MMS to inform the householder the situation of the house, it is more efficient. Also, the warehouses in the factory need more protection. Compared with the tradition methods applying video monitoring, this system saves human resources and time. This protection system can use not only in the houses but also in the warehouses, and we can also use this system in the corner of the workshops.

2. System Introduction The alarm system uses ARM-based microcontroller LPC2368 [3], the monitoring modules includes the temperature sensor DS18B20, the humidity sensor HS1101, the smoke sensor MQ-2, the gate magnetic switch, serial camera, digital door lock module and the GSM mode. The block diagram of the system construction is shown in Fig. 1.

Fig. 1 The block diagram of the system construction The sensors transfer the data to the MCU through the AD interface. Every sensor is placed in the right place, and connects the MCU through the wires, so they can monitor the situations everywhere. The program includes three parts. First the sensors transfer the alarm messages to the microcontroller, then the LPC2368 control the camera to capture the images, finally, the MCU send the MMS to the phone through the GSM mode. 3. Hardware Design The microcontroller LPC2368 is ARM-based microcontroller for applications requiring serial communications for a variety of purposes. It contains up to 512kB of embedded high-speed flash memory and up to 32kB SRAM, 10-bit ADC with input multiplexing among 6 pins, four UARTs with fractional baud rate generation, it can realize all the communication means of this system. The data of the pictures stored in the SD card. The temperature sensor is DS18B20. It measures temperatures from -55°C to+125°C. The accuracy is 0.5°C. Thermometer resolution is programmable from 9 to 12 bits information is sent to/from the DS18B20 over a 1-Wire interface. The humidity sensor is HS1101, it is full interchangeability with no calibration required in standard conditions, including wave soldering, reflow and water immersion. We use the integrated circuit TLC555

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to record the change of the signal from the sensor and turn the signals into the change of frequency. So the microcontroller captures the frequency signal. The circuit is shown in the Fig. 2.

Fig. 2 The interface circuit of HS1101 The smoke sensor is MQ-2. This sensor can be applied in the house or in the factory to detect the leakage of the harmful gas. It can detect the natural gas, methane, propane, butane, alcohol, hydrogen and so on. It can measure wide range and respond quickly, it is high sensitive and steady. The driving circuit is simple. The interface circuit of MQ-2 is shown in Fig. 3.

Fig. 3 The interface circuit of MQ-2 To guard against housebreaking, this system also contains gate magnetic switches to alarm the theft. The gate magnetic switch is normally closed. Whenever the door is open, the normally closed switch disconnects, the voltage changes, if the voltage beyond the limit, it will alarm. The keyboard is a numerical keyboard which has a USB interface. LPC2368 has internal USB transmission protocol [4]. So it connects with LCP2368’s pins directly. The camera has up to 300 thousand pixels. Its output format is JPG. It transfers the data to the microcontroller through RS232 interface. The GSM mode also communicates with LPC2368 through RS232 interface. We use GSM mode to send MMS [5]. There are some LEDs to show the working state. LPC2368 has internal SD card interface, the system stores data into the SD card.

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4. Software Design The program includes three parts. The flow chart of the program is shown in Fig. 4.

Fig. 4 The flow chart of the program First, we initialize the microcontroller, program the PCON register to enable the idle mode, configure the “PCONP” register to disable the undesired peripheral functions. Then decide the normal data for every sensor. The microcontroller waits for the instructions from the AD pins or counter pin. The LPC2368 has 10 bit A/D converter with input multiplexing among 6 pins. We set the AD convert time sequence and AD convert precision, configure the AD interrupt register, when the AD convert finishes, the interrupt requests come, and the microcontroller generates interrupt and receives the data. Compare the data with the presetting ones. If the data are abnormal, the microcontroller asserts an alarm. The humidity sensor HS1101 [6] shows the changes of the humidity through the change of capacitance. So we use TLC555 to turn the change of capacitance into the change of frequency. The compute of the cycle is as formula (1): , ,

. (1) The output pin of the sensor connects with the external counter pin of LPC2368 to read the change of cycle, the counter pin record the sampling frequency then the microcontroller decides whether the humidity of the room is abnormal or not after comparing with the presetting numbers. We use USB communications for the numerical keyboard. The USB pins receive the data by interrupt. If the right password enters, the microcontroller shall ignore the signal from the gate magnetic switches on the door and windows, other sensors will work as usual. If the data received from the sensors are abnormal, the microcontroller operates the camera, sending the receive instruction to take a photo. Then store the image data into the SD card. Configure the “MICClock”, “MCIDataLength”, “MICDataCtrl” and so on registers to operate the MCI. The passwords are also stored in the SD card. At the same time, the MCU control the buzzer making a sound for 30 seconds or more. The microcontroller sends “AT” instructions to operate the GSM mode. Send “AT^UPLOADFILE” instruction to upload the image data to the GSM mode from the SD card, if the acknowledge

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is ”UPLOAD FILE OK”, send the instruction ”AT^MMSSEND” to GSM mode to tell the phone number. Then the GSM mode sends the MMS to the householder’s mobile phone to inform the alarm. 5. Experiment Result And Conclusion The overall core structure of the system and the test result is shown in Fig. 5.

Fig. 5 The overall core structure of the system and the test result Through the test, we can see whenever the danger happening, the system will inform the householder at once. The MMS is shown below. This system is good at house or warehouse protecting. It can detect many aspects and adapt many places. Inform the householder the alarm through GSM is the tendency in the future and MMS can tell the householder more information than SMS. Acknowledgments The authors would like to acknowledge National Natural Science Foundation of China (51005142, 50975168, and 60975068), National 863 Project (2009AA04Z211), and “Chen Guang” project supported by Shanghai Municipal Education Commission (10CG43) and Shanghai Education Commission Foundation (09zz091) for providing financial support for this work. References
[1] Shuchao Ma; Ming Zhu; Lei Wang; Lei Shu; Suran Li; Shumin Huang: A Remote Monitoring System of IDC Room Based on ZigBee Wireless Sensor Networks. In: Eighth IEEE International Conference onDependable, Autonomic and Secure Computing, 2009, pp: (782 - 787)2009. [2] Huiping Huang; Shide Xiao; Xiangyin Meng; Ying Xiong: A Remote Home Security System Based on Wireless Sensor Network and GSM Technology. In: 2010 Second International Conference on Networks Security Wireless Communications and Trusted Computing, pp: 535 – 538(2010). [3] Shang He; Li ShuHua; Li Dong: Design and implement of an embedded Ethernet system based on LPC2368 microprocessor. In: Eighth IEEE International Conference on Dependable, Autonomic and Secure Computing, pp: 782 – 787(2010). [4] Shuixiang Li; Ying Cai: Development of data communication system applied to electrical instruments based on USB interface. In: 2010 International Conference on Computer Design and Applications, pp: V4-424 - V4-428(2010). [5] Maohai Li;Lining Sun; Qingcheng Huang; Zesu Cai; Songhao Piao: GPRS Based Guard Robot Alarm System Design. In: 2009 Fourth International Conference on Internet Computing for Science and Engineering (ICICSE), pp: 211 – 216(2009). [6] Wen Xinling: Avian Hatching Monitor and Control System Based on 1-Wire Sensor Groups. In: International Workshop on Education Technology and Training 2008, and 2008 International Workshop on Geoscience and Remote Sensing, pp: 357 – 360(2008).


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