CN209120204U

CN209120204U - A kind of CAN bus based Lora radio transmitting device

Info

Publication number: CN209120204U
Application number: CN201821813146.8U
Authority: CN
Inventors: 高政; 徐靠; 宋小平
Original assignee: Hangzhou Kongtrolink Information Technology Co Ltd
Current assignee: Hangzhou Kongtrolink Information Technology Co Ltd
Priority date: 2018-11-05
Filing date: 2018-11-05
Publication date: 2019-07-16
Anticipated expiration: 2028-11-05

Abstract

The utility model discloses a kind of CAN bus based Lora radio transmitting device, the system includes: power supply and communication interface (1), power-supply system (2), CAN bus communication module (3), MCU(4), Lora communications module (5), Lora antenna terminal (6), which has conversion, encapsulation, classification and the transparent transmission function of CAN bus data and wireless data.

Description

A kind of CAN bus based Lora radio transmitting device

Technical field

The utility model is applicable in the acquisition of wireless sensor data in Internet of Things monitoring field, and in particular to one kind is based on The Lora radio transmitting device of CAN bus.

Background technique

In Internet of Things monitoring scene, need to install number of multiple sensors to acquire each monitoring point in real time at the scene According to such as a large amount of Temperature Humidity Sensor.A data collection host can be generally configured in monitoring scene for sensing data Acquisition.Entire monitoring system includes data collection host and sensor, at present more popular and general mutual contact mode be by Sensing data is accessed in data acquisition equipment by RS485 bus form or simple dry contact form, data collection host Data are analyzed and be stored in local and is reported to monitor supervision platform.

Internet of Things industry flourishes, and application scenarios have been not limited to that environment is preferable, the lesser computer room in space and behaviour Room is controlled, is unfolded to apply in field of industrial manufacturing.Industry manufacture scene space is big, the distance between monitoring device and sensor It being differed for tens meters to rice up to a hundred, wiring problem becomes more and more intractable, and it is not only at high cost, and long construction period.In industry Field network condition is generally poor, even if there is WIFI network, the transmission range and penetration power of WIFI can not.

Summary of the invention

The purpose of this utility model is that above situation there are aiming at the problem that, a kind of CAN bus based Lora is provided Radio transmitting device.

It is based on the technical solution adopted by the utility model to solve the problem is as follows: installing one on data acquisition equipment The radio transmitting device of CAN bus installs Lora wireless transport module on the sensor of distribution throughout, and sensor passes through Lora module receives the data that acquisition equipment is sent, and replys itself response data by Lora module.

Device includes power supply and communication interface, power-supply system, CAN bus communication module, MCU, Lora communications module, Lora Antenna terminal.The device is mounted on nearby on the acquisition host of Internet of things system, and neighbouring all such monitoring devices can pass through one Root CAN bus is cascaded.CAN bus includes 4 cores, wherein two cores, for communicating, two cores are used to power to device.Power supply system System is that the modules of the present apparatus distribute power supply, and CAN bus communication module provides external CAN bus communication for the present apparatus and leads to Road, scheduling and regulation core of the MCU as whole device, it is logical to be responsible for CAN bus data transmit-receive and Lora wireless data transceiving etc. Letter and logic business.When carrying out data communication, which can realize that CAN bus data turn to the transparent forwarding of Lora and classification Hair, while can also be on transparent data to CAN bus when receiving data.The Lora communications module mould group high using integrated level, It is communicated between MCU by SPI mode, MCU can configure the working method of Lora communications module, work by spi bus Frequency range and transmission power.Part between Lora communications module and antenna terminal is added to high-pass filter, improves wireless signal Transmission quality.

In Lora wireless transmission method, which can be used as host use, also can be used as slave use.Make as host Used time can be sent by broadcast mode and be ordered, and when as slave, can realize data separation by distributing different data addresses.

Detailed description of the invention

The CAN bus based Lora wireless extension device structure chart of Fig. 1

Fig. 2 installation's power source system framework figure

Fig. 3 CAN bus communication module frame diagram

Fig. 4 Lora wireless module connection figure.

Specific embodiment

As shown in figure, the utility model consists of the following parts: power supply and communication interface (1), power-supply system (2), CAN Bus communication module (3), MCU(4), Lora communications module (5), Lora antenna terminal (6).

Power supply and communication terminal (1) are used for input system power supply, provide the external communication interface of detection device, power supply and logical Believe that terminal uses 4 core Green Flammability terminals, wherein 1,2 be positive pole and cathode, supports the input of 9-16V direct current, 3,4 be CAN The H and L of bus communication.

As shown in Fig. 2, power-supply system (2) be used for CAN bus communication module (3), MCU(4), Lora communications module (5) Reliable and stable power supply is provided, power input+12V, generation+5V power vd D5V is to system power supply after 78M05.78M05 is defeated Enter end and be added to TVS protection device SMBJ15A, 1,206 10 Ohmic resistances are encapsulated as at input terminal increase by two, are used for power supply Decompression, reduces the calorific value of 78M05.On the one hand VDD5V gives CAN bus communication module to power, on the other hand pass through XC6206P332MR produces 3V3, and the ceramic disc capacitor of a 10uF is added between XC6206P332MR output positive and negative charge for electricity Source filtering, 3V3 are used to power to MCU, Lora wireless module.

As shown in figure 3, CAN bus communication interface (3) is connected to data acquisition master by CAN bus mode for the device Machine, CAN chip used in this programme are TJA1040, are powered as 5V, and MCU signal is 3.3V, uses optocoupler TIL2362 real The docking of existing two sides level, optocoupler front end power-supply system are 3.3V, and pull-up resistor is 470 ohm, and rear end power-supply system is 5V, on Pull-up resistor is 4.7K ohm.CANL the and CANH output end of chip TJA1040 respectively concatenates the magnetic of 10 Ohmic resistance and@120 One, pearl, 47pH capacitor one and 120 Ohmic resistances one are added between CANL and CANH.

MCU(4 communication task, testing current task are carried out) as the operation of whole device and control core, in this programme The MCU chip used is 48 pins, the STM8S207C8T6 for being encapsulated as LQPF64, and chip debugging uses SWD mode, SPI interface It is simulated using IO, uses PC7, PC6, PC5 respectively, the reset pin of PE5, Lora communications module use PE6.

As shown in figure 4, the communication mode between MCU and Lora communications module (5) is SPI mode, wherein four signal wires It is added to the pull-up resistor of 10K respectively, Lora communications module selects ZM470SX-M, the supply voltage 3.3V of Zhou Ligong, and It is added to the capacitor of 220PF between Lora antennal interface, the filter capacitor of 10pF is added between aerial signal and place of working.

Lora antennal interface (6) uses the SMA-KE connector of fine copper, and reliable ground, centre are aerial signal to connector twice. In PCB layout, to reduce radiation, loss etc., antenna leads are no more than 2cm to Lora module as far as possible, walk bottom floor file, cabling Via hole is made in two sides, and antenna makes module far from noise source (such as crystal and clock cable) as far as possible, and antenna arrangements are openr It is local and far from the metallic objects such as bulky capacitor.

Claims

1. a kind of CAN bus based Lora radio transmitting device, comprising: power supply and communication interface (1), power-supply system (2), CAN bus communication module (3), MCU(4), Lora communications module (5), Lora antenna terminal (6), it is characterised in that: power supply and logical Believe interface (1) and power-supply system (2), CAN bus communication module (3) connection, MCU(4) it is communicated with power-supply system (2), CAN bus Module (3), Lora communications module (5) connection, Lora antenna terminal are connect with Lora communications module (5).

2. a kind of CAN bus based Lora radio transmitting device according to claim 1, it is characterised in that: the device Conversion, encapsulation, classification and the transparent transmission of CAN bus data and Lora wireless data may be implemented.

3. a kind of CAN bus based Lora radio transmitting device according to claim 1, it is characterised in that: the device It multiple can install simultaneously, multiple Lora radio transmitting devices are concatenated by a CAN bus, establish data with Lora node Connection.