Intelligent Wireless Indoor Monitoring System based on ARM
Contents
1. IJACSA International Journal of Advanced Computer Science and Applications Vol 6 No 6 2015 Intelligent Wireless Indoor Monitoring System based on ARM Jia Chunying Zhang Liping Chen Yuchen School of Electronic and Electrical School of Electronic and Electrical School of Electronic and Electrical Engineering Engineering Engineering Shanghai University of Engineering Science SUES Shanghai China Abstract This paper proposed an intelligent wireless indoor monitoring system based on STM32F103 The system compromises a master and terminals which communicates through a CC1101 433M wireless unit Using ENC28J60 and SIM900A to access Ethernet the system can intelligent push information to cloud server therefore we can observe and control terminals remotely This paper present an algorithm based on MCU ID for terminal code recognition The algorithm can intelligently discriminate terminals through code matching code between master and terminals though hardware and software of terminals is similar The experiment demonstrates that the proposed system is robust stability real time and obtains accurate warning information Keywords STM32 CC1101 Intelligent Monitoring ID Corresponding Code Discrimination I INTRODUCTION With the rapid development of China s network technology information technology economy people s requirements of the life quality increase gradually In such a high paced living environment traditional in2. Prof Zhang Liping a respectable responsible and resourceful scholar who has provided me with valuable guidance in every stage of the writing of this paper Without her enlightening instruction impressive kindness and patience I could not have completed my paper Her keen and vigorous academic observation enlightens me not only in this paper but also in my future study I would also like to thanks my teacher Prof Chen Yuchen he have helped me to develop the fundamental and essential academic competence REFERENCES 1 STMicroelectronics STM32Reference annual RM0008 http www stm com 2012 16 18 69 70 422 472 301Page www ijacsa thesai org 2 3 4 5 6 7 8 IJACSA International Journal of Advanced Computer Science and Applications Texas Instruments CC1101 user s manual EB OL 2008 http focus ti Com lit ds symlink1 c 101 pdf Nan Yimin Based STM32F103xxx peripheral device programming STM32 standard peripheral libraries J Journal of Changsha Aeronautical Vocational and Technical College 2010 04 41 45 CC1101 Single Chip Low Cost Low Power RF Transceiver Data Sheet Z Texas Instruments 2008 WIFI chip of low power specification ESP8266 s 2013 12 5 6 Hosam El Ocla TCP CERL congestion control enhancement over wireless networks J Wireless Networks 2010 16 1 183 198 Wang Mingxin GSM Remote Monitoring System Based on SIM900A J Journal of computer knowledge and t
3. 4 13 12 11 10 9 8 6 5 4 3 0x00 ts tE 13 12 11 10 9 8 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 Fig 8 ID Code Storage Structure c Reads and encrypted ID code Use the following code in the main program can read the MCU 96 ID CpuID 0 vu32 Ox Lffff7e8 CpuID 1 vu32 Ox1 ffff7ec CpulD 2 vu32 Ox Lffff7 0 Considering the practical use does not need to 96 bit as well as security using simple encryption algorithm compresses 96 to 24 bit codes the encryption algorithm is ID_Code CpuID 0 gt gt 1 CpuID 1 gt gt 2 CpuID 2 gt gt 3 d Matching Code In this paper for security reasons we uses a match code switch in hardware The hardware circuit is shown in Figure 9 3v3 3V3 Fig 9 code switching circuit KEY 1 is the match code button When the button is pressed for more than 2s it will start the program of match code Master sends and saves ID Code while the success of matching code is returned As the matching code indicator light LED 1 will flash 5 times in frequency of twice per second after success of matching code Vol 6 No 6 2015 V EXPERIMENTAL RESULTS AND ANALYSIS We selected a 4 rooms and 2 hall area of 128 square meters for experimental A host was placed in a drawing room and terminals were placed in cook room gas monitor bathroom emergency button study room smog monitoring mas
4. controller is provided by two interrupt pin INT and WOL and SPI pins SO SI SCK CS The data transfer rates of ENC28J60 is up to 10Mb s Two dedicated pins LEDA LEDB is used for connecting a LED which indicators the network activity Figure 4 is the wiring diagram for the MCU with ENC28J60 C2860 so TX RX INT Buffer MAC PHY WOLn Fig 4 ENC28J60 and MCU circuit IV SOFTWARE SYSTEM A The host software and system structure In this system we used Keil uVisionS MDK as development tool It was officially released by ARM on October 2013 It includes data collection procedures Wiegand ID card SPI driver and TCP IP communication protocol LwIP protocol SIM900A AT command communication program serial communication program and the main loop procedures Master program flow is shown in Figure 5 28 Page www ijacsa thesai org IJACSA International Journal of Advanced Computer Science and Applications Initialization Power_Check ID_Card_Check Node_Data_Check Fig 5 Figure 5 flowchart The main program is mainly responsible for components initialization In software systems Because of the control parts is fewer we do not use the operating system The matching code switch is used to discriminate the same set of identification for communication between devices B Communication between the host and terminal 1 The Communication Protocol In this design the communication betwee
5. dentify the terminal which sends information it received To solve the problem we propose a solution to identifying terminal by MCU ID Code a Electronic Signature Electronic signature stored in the system memory area of the flash memory module you can use JTAG SWD or CPU to read Chip identification information contains writing at the factory User firmware or external device can read an electronic signature to automatically match the different configurations SRM32F10xxx microcontroller b MCU 96 bit unique identity ID A 96 bit of unique identity is provided to any one of the STM32 microcontroller Users under any circumstances cannot change this identity The 96 bit unique identity of the product according to the usage of different users can be read in bytes 29 Page www ijacsa thesai org IJACSA International Journal of Advanced Computer Science and Applications 8 bit as a unit or can be read in half word 16 bit or whole word 32 bit Product unique identity is very suitable to be used as 1 A sequence number such as USB serial numbers or other characters in the terminal application 2 A password in the preparation of flash memory 3 In conjunction with this uniquely identifies software encryption and decryption algorithms to improve code safety in the flash memory 4 Safety mechanism to activate the bootstrap process The structure of the ID storage is shown in Figure 8 Address Base rae ard FTES Offset 15 1
6. door video surveillance systems appear to be inadequate Intelligent interior monitoring system uses the cloud server which can real time detect indoor state when an exception occurs automatically alarm and timely send the warning to user Therefore it can greatly reduce the family security risks In this paper an intelligent system based on STM32F103 is designed to predict household hazards and send the indoor gas concentrations and smoke density information situation of indoor power emergency data to the monitoring center through both wired and wireless network Cloud server Host Hae Terminal Fig 1 Monitoring system proposed Shanghai University of Engineering Science SUES Shanghai China Shanghai University of Engineering Science SUES Shanghai China As shown in Figure 1 the system consists of a host and terminals which communicates each other through 433M wireless units II MONITORING HOST As shown in Figure 2 the Monitoring host contains a 433M wireless communication unit a WIFI and a RFID module an Ethernet and a GPRS GSM module 433M Wireless gt WIFI i i External Interrupt Ethernet Twisted Pair E gt GY Fig 2 monitoring host Host Communicate with the terminal through a 433M wireless module Normally the host uses a query me
7. echnology 2014 15 3500 3504 Wang Lei Wang Jun Embedded remote appliance controller design Based on SIM900A J 2014 27 1 76 80 9 10 11 12 13 Vol 6 No 6 2015 lwIP A Lightweight TCP IP stack EB OL http savannah nongnu org projects lwip Han Zexi Lv Fei Research and development of GSM network AT command emulation system J Modern electronic technology 2005 28 17 9 11 Bi Dandan Li Yun Feng Zhi Smart car design based on MCU and GSM modules J Data communication 2014 04 41 43 Wei Hongtao Wong Huijuan Wu Xixiu The Design and implementation of emergency communication control system Based on 3G J Journal of Wuhan University of Technology Information amp Management Engineering 2014 36 04 443 446 Que Fanbo The Design of program Remote upgrade Based on STM32 J Electronic Instrumentation Customer 2013 05 90 92 311Page www ijacsa thesai org
8. ll SPI interfaces can use DMA operations It has 3 UART and 2 UART serial communication interface USART1 interface communication rate up to 4 5 Mbit sec interface speed up other communication 2 25 Mbit s 1 B 433M wireless communication module 1 Introduction and Application CC1101 Host and terminal use a CCI1101 chip to realize communication CC1101 is a high performance sub 1GHz wireless transceiver designed for low power RF applications It s mainly used for industrial scientific and medical ISM and short range device SRD CC1101 provides packet handling data buffering burst transmissions received signal strength indication RSSI clear channel assessment CCA Wireless on wake WOR extensive hardware support CC1101 and CC1100 are compatible in code package and pin out It is open to sub 1GHz frequency RF design which is commonly used in world 2 Interfaces between MCU and CC1101 are shown in Figure 3 CC1101 Fig 3 MCU and CC1101 2 Wireless module CC1101 have five work modes part of the idle mode sleep mode receive mode sent mode and crystal oscillator close mode The work mode of the chip can be change by the internal set register of the external pin At first electrify the chip will enter the sleep mode pause work but the value of internal chip register can t be lost When wireless module is in a dormant state you can pin CSn is pulled low so that the module enters an idle state You can
9. n host and terminal uses a 433M wireless module which has strength signal high anti jamming etc The communication included request response and transmission closed four states The switch of communicate state is shown in Figure 6 Terminal Ci jon on Nectj on Connect request Fig 6 Communication state transition 2 Encryption Algorithm In order to ensure secure communications the design uses a lightweight ECC encryption algorithm Elliptic Curves Cryptography ECC is a public key encryption system which is proposed in 1985 by Koblitz and Miller The mathematical Vol 6 No 6 2015 basis of ECC is rational points on an elliptic curve additive group constituting the Abel elliptic discrete logarithm computational difficulty Compared with classic RSA DSA and other public key cryptosystem elliptic cryptosystem has high security processing speed small storage space and low bandwidth requirements Some studies indicate that elliptical key 160 and 1024 has the same RSA key security On the private key encryption and decryption ECC algorithm has a faster speed than RSA DSA Elliptic Curves Cryptography flow is shown in Figure 7 Put integer w express as binary system W 1 7 81 40 Fig 7 Flow chart of Elliptic Curves Cryptography 3 The match code identification solutions based on MCU ID Since the terminal can freely expand there will have an identical terminal device The host cannot i
10. read and write the chip Vol 6 No 6 2015 registers and mode settings when the wireless module enters an idle state When we set inside STX bit register crystal is startup and CC1101 wireless module enters a transmission mode If the bit is set SRX the wireless module of CC1101 enters into the receiving state 3 When they need to send data STM32F103ZET6 writes data to wireless module at a lower rate through SPI RF circuits start after writing completed while RF circuits send written data out and empty TX FIFO register When wireless module received data it sent the received data is to STM32F103ZET6 through the SPI Because the wireless module can enter sleep mode to reduce power consumption CC1101 wireless module can automatically generate the CRC and preamble code which reduces the complexity of system design 3 Ethernet Module We used ENC28J60 for Ethernet communication ENC28J60 is the first 28 pin stand alone Ethernet controller over the world It is produced by Microchip and provides a low pin count low cost streamlined remote communications solutions for embedded systems ENC28J60 is an independent Ethernet controller with an industry standard serial peripheral interface It meets all IEEE 802 3 specification using a series of packet filtering schemes to limit incoming packets It also provides an internal DMA module for fast data throughput and hardware support for IP checksum calculation Communication with the host
11. ter bedroom bed vacancy monitor Test results are shown in Table 1 and Table 2 TABLE I ETHERNET IS CONNECTED Monitoring host Server Response delay response delay Cook room 326ms 3 2s Bathroom 216ms 2 1s Study room 302ms 1 3s Bedroom 416ms 3 28 TABLE II ETHERNET IS DISCONNECTED Monitoring host Server Response delay response delay Cook room 413ms 10 6s Bathroom 321ms 11 3s Study room 215ms 10 7s Bedroom 258ms 12 5s As shown in Table 1 and Table 2 it can be seen that he server response time is about 2 5s when Ethernet is connected whereas the server response time is about 12s when the Ethernet is disconnected Because this phenomenon is that SIM900A_ uses GPRS to communicate while GPRS transmission rate is only about 56 to 114Kbps However 10Mbps is a certain gap for ENC28J60 System design taking into consideration factors such as cost and stable areas there is no choice of the current 3G 4G communications technology VI CONCLUSION The experiments show that the control system design is reasonable reliable operation and has good scalability comparing to traditional video surveillance system The alarm information is accurate targeted and real time The system pushes cloud exception information to cloud server which is used remotely observe and control terminals ACKNOWLEDGMENT First and foremost I would like to show my deepest gratitude to my supervisor
12. thod to get terminal operating status The monitoring terminal sends alarm information to the host immediately if an abnormal condition is detected The host sends the information to the cloud server through wired Ethernet or GPRS GSM The server pushes messages to user s phone to achieve the purpose of real time monitoring HI HARDWARE A Cortex M3 STM32F103VET6 We used a STM32F103VET6 MCU as the system s core which is produced by ST Microelectronics STM32F103VET6 is based on ultra low power ARM Cortex M3 processor core The STM32F103VET6 series are a powerful lineup in 32 bit STM32 microcontroller family They have good compatibility ARM Cortex M3 core set is specialized in high efficiency low energy in real time applications It has high cost effective which embedded developers favor so much The enhanced chip 27 Page www ijacsa thesai org IJACSA International Journal of Advanced Computer Science and Applications with 512KB RAM and 64KB SRAM has the maximum operating frequency of 72MHz up 1 25DMips MHz 1 at zero wait cycle memory access The chip has more than three SPI serial peripheral interface The full duplex or half duplex communication rate of SPI can be up to 18 Mbit sec in slave or master mode It has a 3 bit prescaler which produces eight kinds of master mode Its frequencies can be configured as 8 or 16 bits per frame Hardware CRC generation verification supports basic SD card and MMC mode A
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