CN103167039B - A kind of development platform towards polymorphic type ZigBee node - Google Patents

Abstract

A development platform for multi-type ZigBee nodes, including a motherboard and a pluggable daughter board; the motherboard is provided with a power supply circuit, a radio frequency daughter board interface, a sensor signal input interface, an analog sensor daughter board interface, and an intelligent sensor Sub-board interface, PC communication sub-board interface, debugging interface, LCD sub-board interface and battery interface; the pluggable sub-board includes radio frequency sub-board, analog sensor sub-board, smart sensor sub-board, LCD sub-board, PC communication daughter board. The present invention adopts a modular design concept, and through the combination of the motherboard and different sub-boards, functions such as a coordinator, a router, and a terminal collection node can be realized, so that different node types can be developed on a common motherboard platform. The purpose of the invention is to effectively reduce the design cycle of the sensor network node and reduce product maintenance costs.

Description

A development platform for multi-type ZigBee nodes

technical field

The invention belongs to the field of sensor networks and relates to a ZigBee development platform with multi-type node functions.

Background technique

ZigBee is a short-distance, low-power, low-cost and low-complexity wireless transmission technology with a maximum transmission rate of 250kb/s. It is suitable for the fields of wireless sensor network, automatic control and remote control. At present, hundreds of semiconductor and communication companies have joined the ZigBee Alliance, and the market potential is huge.

A node is the most basic unit of a ZigBee network, and can be divided into a coordinator (Co-ordinator), a router (router) and a terminal node (End-Device) according to the role played by the node in the network. The coordinator is the center of the sensor network and is responsible for the initiation and shutdown of the network. The router is responsible for the message forwarding function, and can also assume the terminal node function. Terminal nodes implement specific functions according to requirements, such as data collection and sending.

Each type of node has certain differences due to different uses and purposes. For example, coordinators and routers are often powered by DC power, and terminal nodes are generally powered by batteries; coordinators need LCDs to display network and node information, while routers and Terminal nodes are often not required. At present, hardware platforms for different types of sensor network nodes are often redesigned, which increases design and maintenance costs and prolongs the design cycle.

Contents of the invention

In view of the deficiencies in the prior art, the purpose of the present invention is to provide a development platform for multi-type ZigBee nodes, adopting a unified hardware motherboard and different sub-boards, it is possible to realize coordinators, routers, terminal acquisition nodes, etc. Features.

The present invention realizes through following technical scheme:

A modular development platform for multi-type ZigBee nodes suitable for ZigBee sensor networks, including a motherboard and a pluggable daughter board; the motherboard is provided with a power supply circuit, a radio frequency daughter board interface, and a sensor signal input interface , analog sensor sub-board interface, smart sensor sub-board interface, PC communication sub-board interface, debugging interface, LCD sub-board interface and battery interface; the pluggable sub-board includes radio frequency sub-board, analog sensor sub-board, smart sensor Daughter board, LCD daughter board, PC communication daughter board.

The core function of the motherboard of the development platform is to provide the power supply of the system and provide rich resource interfaces for the interconnection and intercommunication of each sub-board.

The power supply circuit of the motherboard provides power for the motherboard and each sub-board, and realizes several types of power supply modes such as external DC power supply, debugging interface power supply, PC communication power supply, battery power supply, and mutual protection.

The radio frequency daughter board is inserted into the radio frequency daughter board interface, the LCD daughter board is inserted into the LCD daughter board interface, the analog sensor daughter board is inserted into the analog sensor daughter board interface, the smart sensor daughter board is inserted into the smart sensor daughter board interface, The PC communication daughter board is plugged into the PC communication.

The radio frequency daughter board includes a ZigBee integrated chip, a Buck regulator circuit, a clock circuit, and an antenna to realize the reception and transmission of ZigBee wireless signals, and can be used for three types of nodes: a coordinator, a router, and a terminal.

The analog sensor sub-board uses I/V conversion, amplification, filtering and other conditioning circuits to condition the analog signal input by the sensor, so as to prepare for the analog-to-digital conversion of the sensor signal.

The intelligent sensor sub-board realizes the conversion of the interface level of the intelligent sensor, and converts the non-CMOS level of the RS232, RS485, and RS422 of the sensor into the CMOS level that the ZigBee integrated chip can receive.

The PC communication sub-board realizes the conversion from the USB interface to the UART interface, and provides the communication interface between the ZigBee node and the PC.

The LCD sub-board includes an LCD display screen and a driving circuit to realize the display of node information.

The sensor signal input interface realizes the access of multi-channel analog signals, multi-channel digital signals and intelligent sensor signals. Smart sensor interface types include RS232 interface, RS485 interface, SPI interface, IIC interface.

The battery interface is used for connecting the battery and can be connected to a battery box.

When realizing described coordinator function, insert LCD sub-board, PC communication sub-board, radio frequency sub-board at mother board; And carry out communication by PC communication sub-board and computer, realize the management and data collection to ZigBee network by PC; Coordinator The power supply of the communication daughter board is obtained through the USB interface of the PC.

When implementing the router, a radio frequency sub-board is inserted on the motherboard; the router is powered by an external DC power supply.

When implementing the terminal acquisition node, insert a radio frequency sub-board on the motherboard, simulate a sensor sub-board, an intelligent sensor sub-board, and a battery; the sensor signal to be collected is connected to the terminal node through the sensor signal input interface.

Owing to having adopted above-mentioned technical scheme, the present invention has following advantage and positive effect compared with prior art: the present invention is to adopt mother board to add the mode of pluggable sub-board to realize modularized-ZigBee node development platform, through Inserting different sub-boards can cover node types such as coordinator, router, and terminal acquisition node, so that different node types can be developed on a common motherboard platform. The invention can effectively reduce the design cycle of sensor network nodes and reduce product maintenance costs.

Description of drawings

Fig. 1 is a schematic diagram of the hardware structure of the development platform provided by the present invention.

Fig. 2 is a power connection diagram of the development platform provided by the present invention.

FIG. 3 is a schematic diagram of a Buck regulator circuit of a radio frequency sub-board provided by the present invention.

Fig. 4 is a connection diagram of the coordinator of the development platform provided by the present invention.

Fig. 5 is a router connection diagram of the development platform provided by the present invention.

Fig. 6 is a connection diagram of terminal collection nodes provided by the present invention.

detailed description

The present invention will be further described below in conjunction with specific drawings and implementation examples.

Embodiments of the present invention relate to a ZigBee-based sensor network node development platform, as shown in Figure 1, the platform at least includes: a development platform motherboard, a radio frequency sub-board, an LCD sub-board, a PC communication sub-board , an analog sensor daughter board, and a smart sensor daughter board.

The core function of the motherboard of the development platform is to provide a core carrier for coordinator, router, terminal acquisition and other types of nodes, and to provide important interfaces for each sub-board.

The radio frequency sub-board includes a ZigBee integrated chip MC13226, which integrates ARM core, 2.4GHz radio frequency transceiver, IEEE802.15.4MAC hardware accelerator and AES hardware accelerator, built-in FLASH, SRAM and ROM, AD conversion and other modules, and supports ZigBee2007/ PRO protocol stack, suitable for receiving and sending ZigBee wireless signals.

The analog sensor sub-board adjusts the analog signal input by the sensor, converts the analog signal input by the sensor (such as I/V conversion), amplifies, filters, etc., thereby converting different types of analog input into a voltage range suitable for the ADC, Prepare for the subsequent analog-to-digital conversion.

The intelligent sensor sub-board interface realizes the conversion of non-CMOS levels such as RS232, RS485, RS422 and CMOS levels of the intelligent sensor interface, thereby facilitating the communication between the data of the sensor and the radio frequency sub-board

The PC communication sub-board includes a FT232RL chip to realize the USB interface to the UART interface; the power supply of the communication sub-board is obtained from the USB interface. When the communication sub-board is connected to the PC through the USB interface, the PC will virtualize a serial port after the driver is installed, through which the control of the node and the data uploaded by the node can be collected.

The LCD sub-board includes an LCD display screen and a driving circuit to realize the display of node information.

The sensor signal input interface realizes the access of multi-channel analog signal, multi-channel digital signal and intelligent sensor signal, which is realized by a group of industrial sockets.

The battery interface is used for connecting to the battery, and can be connected to two 1.5V batteries.

The motherboard and each sub-board are described in detail below.

The motherboard of the development platform shown adopts a flat design, and the plugging operation is simple; the power circuit of the platform is shown in Figure 2. The power supply circuit provides power for the motherboard and each sub-board, and realizes several types of power supply modes such as external DC power supply, debugging interface power supply, PC communication power supply, battery power supply, and mutual protection.

The ZigBee coordinator sub-board includes a piece of MC13226, a Buck regulator circuit, a clock circuit, an antenna, and a set of motherboard interfaces. The motherboard interface is a group of 2*30pin interfaces, which include power supply, JTAG, SPI, IIC, UART, GPIO, ADC analog input port and reference power input. The interface is connected with each sub-board and the sensor signal input socket through the interface on the motherboard. The Buck regulator circuit on the radio frequency sub-board provides a low-power regulation mode for the radio frequency sub-board as a terminal acquisition node, and the Buck circuit can linearly adjust the higher battery voltage to a voltage output of 1.8-2.0V, Thereby effectively prolonging the service life of the battery. Described Buck regulator circuit is shown in Figure 3, is provided with jumper cap J1 and J2 above, when the radio frequency sub-board is used as terminal collection node, jumper cap J1 is connected, jumper cap J2 is not connected, Buck The circuit will work; when the RF sub-board is used as a terminal acquisition node, if the jumper cap J1 is not connected and the jumper cap J2 is connected, the Buck circuit will not work, and the input power supply voltage will not be adjusted to 1.8V-2.0V . The RF sub-board adopts three clock crystal oscillators: the main crystal oscillator with an oscillation frequency of 24MHz; the auxiliary crystal oscillator with an oscillation frequency of 32.768KHz; and the built-in oscillator with an oscillation frequency of 2KHz. The RF sub-board adopts the main crystal oscillator clock under normal working state and Doze mode (a kind of sleep mode), and uses auxiliary crystal oscillator or internal oscillator when the processor enters the sleep state, so as to reduce power consumption.

The analog sensor sub-board adjusts the analog signal input by the sensor, converts the analog signal input by the sensor (such as I/V conversion), amplifies, filters, etc., thereby converting different types of analog input into a voltage range suitable for the ADC, Prepare for the follow-up analog-to-digital conversion; the operational amplifier adopts 7 single-channel operational amplifiers OPA2227. The analog sensor sub-board provides the voltage stabilizing circuit required by the ADC, and the voltage stabilizing chip adopts LM385-2.5V. The analog sensor sub-board has a group of motherboard interfaces 2*10pins, which include power supply, analog signal input, analog signal output, and GPIO (for operational amplifier control).

The intelligent sensor sub-board interface realizes the level conversion of the intelligent sensors of RS232, RS485 and RS422. The smart sensor sub-board includes a MAX13223E and a MAX14841E; the MAX13223E realizes the level conversion between RS232 and UART, and the MAX14841E realizes the level conversion between RS485/RS422 and UART. The smart sensor interface sub-board has a set of motherboard interfaces 2*10pins, which include power supply, RS232/RS485/RS422 signal input and output, and UART signal input and output.

The PC communication sub-board realizes the USB interface to the UART interface, the conversion of the interface is realized by a FT232RL chip, and the power is obtained from the USB interface. The PC communication daughter board has a group of motherboard interfaces 2*10pins, which include USB input and output, UART input and output, and 5V power supply output.

The LCD sub-board includes an LCD display screen and a driving circuit to realize the display of node information. The LCD sub-board has a set of motherboard interfaces 1*10pin, which are connected to the motherboard by cables. The interfaces include power supply, backlight control, and SPI interface; MC13226 controls the working status and display content of the LCD display through the SPI interface.

The sensor signal input interface realizes the access of multi-channel analog signal, multi-channel digital signal and intelligent sensor signal, which is realized by a group of industrial sockets.

The battery interface is used for connecting to the battery, and can be connected to two 1.5V batteries.

The coordinator connection relation that described platform realizes is as shown in accompanying drawing 4, and LCD sub-board, radio frequency sub-board and PC communication sub-board are connected with motherboard, and LCD sub-board displays the node information of network; PC communication sub-board and PC The computer is connected to realize the control of the coordinator by the PC and the upload of network data to the PC; the power supply is obtained from the communication interface by the PC communication sub-board.

The router connection relationship implemented by the platform is shown in FIG. 5 , which connects the RF sub-board and the motherboard, and the power is provided by an external DC power supply.

The terminal acquisition node connection relationship realized by the platform is shown in Figure 6, and the radio frequency daughter board, the analog sensor daughter board, the smart sensor daughter board and the motherboard are connected; the external analog sensor signal, the digital switch signal, and the smart sensor signal pass through the sensor The signal input interface is connected to the node, so as to realize the intelligent collection of sensor data; the power supply is powered by batteries.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be carried out Modifications or equivalent replacements without departing from the spirit and scope of the technical solution of the present invention shall be covered by the claims of the present invention.

Claims (1)

1. towards a development platform for polymorphic type ZigBee node, comprise motherboard and plug type daughter board; It is characterized in that,Described motherboard is provided with power circuit, radio frequency daughter board interface, sensor signal input interface, analog sensor daughter board interface, intelligenceEnergy sensor daughter board interface, PC communicator plate interface, debugging interface, LCD daughter board interface and battery interface; Described plugFormula plate comprises radio frequency daughter board, analog sensor daughter board, intelligence sensor daughter board, LCD daughter board, the PC daughter board of communicating by letter;

Described radio frequency daughter board comprises a slice ZigBee integrated chip MC13226, Buck adjuster circuit, clock circuit, antenna,And one group of 2*30pin motherboard interface A, for reception and the transmission of ZigBee wireless signal; Described 2*30pin motherboard interface AComprise power supply, JTAG, SPI, IIC, UART, GPIO, ADC analog input port and reference power supply input, described 2*30pinMotherboard interface A is connected with each daughter board and sensor signal input socket by the interface on motherboard;

Described analog sensor daughter board is nursed one's health the analog signal of sensor input, by the analog signal conversion of sensor input,Amplification, filtering, thus convert dissimilar analog input to voltage range that ADC adapts to; Described analog sensor daughter boardHave one group of 2*10pin motherboard interface B, this group of 2*10pin motherboard interface B comprises power supply, analog signal input, analog signalOutput, GPIO;

The level conversion of the intelligence sensor of described intelligence sensor daughter board Interface realization RS232, RS485, RS422, described inIntelligence sensor daughter board comprises a slice MAX13223E chip, a slice MAX14841E chip, described MAX13223E coreSheet is for the conversion of RS232 and UART level, and described MAX14841E chip is for RS485/RS422 and UART electricityFlat conversion, described intelligence sensor interface daughter board has one group of 2*10pin motherboard interface C, and this 2*10pin motherboard interface C comprisesPower supply, the input and output of RS232/RS485/RS422 signal, UART input and output;

Described PC communication daughter board is for USB interface to UART interface, and the conversion of interface is realized by a slice FT232 chip, electricitySource is obtained from USB interface, and described PC communication daughter board has one group of 2*10pin motherboard interface D, this 2*10pin motherboard interface DComprise USB input and output, UART input and output, the output of 5V power supply;

Described LCD daughter board comprises LCD display, drive circuit, realizes the demonstration of nodal information, and described LCD daughter board has oneGroup 1*10pin motherboard interface E, adopts winding displacement to be connected with motherboard, this 1*10pin motherboard interface E comprise power supply, backlight control,SPI interface;

Described sensor signal input interface is realized multi-channel analog signal, multi-channel digital amount signal and intelligence sensor signalAccess, adopts one group of industrial socket to realize;

Described battery interface is access battery use, accessible two joint 1.5V batteries;

While realizing coordinator function, described LCD daughter board, described radio frequency daughter board and described PC communication daughter board are connected with described motherboardConnect the nodal information of LCD daughter board display network; Described PC communication daughter board is connected with PC, realizes PC to telegonControl and network data are uploaded to PC, and power supply is obtained from communication interface by PC communication daughter board;

While realizing router feature, described radio frequency daughter board is connected with described motherboard, and power supply is provided by external dc power;

While realizing terminal acquisition node, by described radio frequency daughter board, described analog sensor daughter board, described intelligence sensor daughter board andMotherboard is connected, power acquisition powered battery; External analog sensor signal, digital switch quantity signal, intelligence sensor signalBe linked in node by sensor signal input interface, for the intelligent acquisition to sensor network data;

Described power circuit provides power supply for motherboard and each daughter board, for external dc power, debugging interface power supply, PC communicationPower supply, the Power supply mode of powered battery several types and protection each other.