With the rapid development of Internet software and hardware technology, industrial and scientific research require flap barrier (subway turnstile) access control system to inform flap barrier (subway turnstile) via Ethernet while recording the exact number of people staying in a certain place in real time. Number of people in the access control system site This work has completed a counting device based on embedded network technology that can be displayed in real time on the scene and informed by Ethernet of the number of personnel in a control center in a venue.
In order to be able to distinguish the direction of personnel through the use of two sensor columns A and B, by detecting the sequence of two sensor lines are blocked to distinguish the direction of personnel into and out of the swing gate, the corresponding controller to add 1 or minus 1 operating. Taking into account the general body size of an average adult, four pairs of sensors on each sensor column are arranged at equal intervals from 1.5 meters to 1.2 meters while the distance between the launch tube and the receiver tube of each pair of infrared sensors is limited to 80 cm, and two The distance between the fan sensor rows A and B is set to be 30 cm so as to ensure that only one and the same person can pass through the sensor rows A and B at any time and avoid the occurrence of various conditions that affect normal counting, such as simultaneous detection by many people. AVR microcontroller Ethernet control circuit Ethernut1.3gI1 open source software and hardware embedded system design based on the model, the deletion and redesign of the part.
For the domestic security products are still lack of strong support, most of the products are more emphasis on foreign brands, or a single brand of products; lack of market competition transparency, on the one hand restricted the domestic enterprises to participate in the strength, on the other hand, actually bid In the scheme design, the expandable design of the "card" function of the flap barrier (subway turnstile) security access channel for embedded network technology is limited.
Embedded network technology in the flap barrier (subway turnstile) and other access control systems include the following components: AVR MCU ATmega128 CPU: external expansion of a 32KB RAMKM62256: UART interface on the ATmega128 leads to the DB.9 serial port through the MAX3222 ; Ethernet controller RTL8019ASI3: 20F.01 Ethernet isolation transformer; LM1086 to the interface circuit to provide +5 V power supply. The circuit to the ATmega128 AVR microcontroller core, Ethernet controller RTL8019AS control LAN communications. Through the RS232 interface and the PC terminal or serial debugging assistant to achieve serial communication. The circuit is based on TCP / IP protocol, using Socket method to communicate with the access control center. When the real-time network requirements are not high, the transfer rate of 10Mbps Ethernet controller RTL8019AS has been able to meet the system requirements. ATmega128 provides 22 programmable I / O port, a JTAG and ISP interface. The outputs from sensor A and B are I / O connected to the ATmega128 after a 4-OR gate, respectively. In order to reduce the number of ATmega128 programmable I / O, the use of serial to the digital display circuit to send data.
RS Security Co., Ltd specializes in tripod turnstile, swing barrier, flap barrier, full height turnstile, glass turnstile and gradually improve the product line with magnetic card, IC / ID card, barcode, card dispenser, Product integration, combined with the industry's front-end technology and by virtue of the rich experience of technical staff to develop their own design, processing and production of mature and advanced intelligence channel applications, customers can tailor-made hardware products and software products.