CN206311932U - Usb data transponder based on LoRa modulation techniques - Google Patents

Abstract

The utility model relates to a USB data transponder based on LoRa modulation technology, which includes a USB module, a USB bus, a USB bus protector, an MCU, a LoRa radio frequency module, a power supply module and a transmitting and receiving antenna. The USB module passes through the USB bus Connect with the USB interface of the host computer or the acquisition device, the USB bus is connected with the USB bus protector, and the USB module is also connected with the MCU through 8-bit data lines and control lines; the MCU is connected with the LoRa radio frequency module through the SPI serial port , the power supply module supplies power to the RF module and MCU, and the LoRa RF module is connected to the transmitting and receiving antenna. The utility model adopts LoRa modulation technology, which has the advantages of low power consumption, long transmission distance, and reliable communication. It can realize two-way data exchange with the host computer, instrumentation, data acquisition equipment, etc. through the USB interface. It is useful in the field of remote Internet of things. It is widely used, and the technical realization is relatively simple, and the design cost is low.

Description

USB data repeater based on LoRa modulation technology

technical field

The utility model belongs to a data conversion device, in particular to a USB data transponder based on LoRa technology.

Background technique

Wireless sensor network (WSN) is an important physical basis of the Internet of Things. Its purpose is to realize the collection of a large number of sensing terminal information through wireless technology, so as to achieve the function of sensing and controlling objects. At present, the wireless communication technologies commonly used in WSN include Zigbee technology, BLE technology, 3G/4G technology, and wireless local area network technology. Among them, Zigbee technology and BLE technology are mainly used in short-distance wireless transmission scenarios. For long-distance wireless transmission requirements, a large number of relays need to be built, which greatly increases the cost of communication. 3G/4G technology can provide long-distance communication, but the power consumption of terminal equipment is high, which does not meet the requirements of low power consumption of IoT terminals. The wireless LAN technology terminal equipment consumes a lot of power, and the signal is easily affected by buildings such as walls.

Chinese patent CN204044814U discloses a USB transponder based on ZigBee technology. The USB bus protection device is connected to the computer USB interface through the USB bus. The USB bus protection device is connected to the MCU module. The USB bus protection device protects the USB bus and the MCU module. Function, the USB bus protection device is also connected with a communication indicator light and a power indicator light, the MCU module is connected with the ZigBee communication module through a serial port line to realize data communication between the wireless module and the MCU module, and the buzzer is connected with the ZigBee communication module. This patent can realize the two-way conversion between ZigBee wireless data and computer data, and is widely used in ZigBee wireless data monitoring systems, and the technical implementation is relatively simple, which reduces the design and production costs.

LoRa (Long Range, remote) modulation technology is a modulation method based on spread spectrum technology developed by Semtech. Using this modulation method can realize low-rate data low-power long-distance transmission, and can be used in different Internet of Things devices to realize long-distance transmission of terminal information and long-distance control of terminal equipment.

As a universal serial bus standard, USB supports plug-and-play and hot-swappable functions of equipment, and is widely used in the fields of computer communication, mobile communication, and industrial control to standardize computer systems, communication equipment, and instrumentation Wait for the connection and communication with the peripherals to realize the input and output of data.

The combination of LoRa technology and USB technology can realize the information collection and control of the wireless terminals of the Internet of Things in a distributed environment, and realize the two-way conversion between wireless data and digital signals, which is in line with the development direction of technology applications and has a good application prospect.

Contents of the invention

The technical problem to be solved by the utility model is to provide a USB transponder based on LoRa modulation technology, which is used to realize the long-distance two-way communication between the host computer system such as the computer system and the wireless terminal of the Internet of Things, such as wireless data upload, host computer control command It can also be used to collect and upload data from industrial instruments and meters.

The technical solution adopted by the utility model is: a USB data transponder based on LoRa modulation technology, which includes a USB module, a USB bus, a USB bus protector, an MCU, a LoRa radio frequency module, a power supply module and a transmitting and receiving antenna. The USB module is connected with the USB interface of the upper computer or the acquisition device through the USB bus, and the USB bus is connected with the USB bus protector, and the USB module is also connected with the MCU through 8-bit data lines and control lines; the MCU is connected through the SPI serial port Connect with the LoRa radio frequency module, the power supply module supplies power to the radio frequency module and MCU, and the LoRa radio frequency module is connected to the transmitting and receiving antenna.

Preferably, the USB module is also connected to a communication indicator light. The communication indicator is used to indicate whether there is data transmission.

Preferably, the power supply module is connected to a 5V power supply through a USB interface.

Preferably, said MCU adopts chip STM8Lx. The MCU module adopts an ultra-low-power single-chip microcomputer model STM8Lx, receives the data of the LoRa radio frequency module through the SPI interface and sends it to the USB device through the USB bus. Or send the data sent from the USB bus to the LoRa radio frequency module through the SPI interface.

Preferably, the LoRa radio frequency module adopts chip SX12x. The LoRa radio frequency module adopts the SX12x chip of Semtech Company, which has the characteristics of low power consumption and high sensitivity. At the same time, it is connected to the MCU through the SPI interface, and is responsible for converting data into electromagnetic waves, or converting electromagnetic waves into data. The utility model can configure the LoRa radio frequency module through the USB interface, including channel, transmission power, modulation mode and so on.

Preferably, the USB module uses a chip CH372B. Described USB module adopts the USB bus general-purpose device chip of model CH372B, and CH372B has 8 data buses and reads, writes, chip selection control line and interrupt output, can be connected to the control such as single-chip microcomputer/DSP/MCU/MPU conveniently. device on the system bus and supports low-power modes.

In the utility model, the USB bus protector plays the role of protecting the USB bus and the MCU, and the USB module plays the role of interface conversion and data conversion. Preferably, the USB bus protector adopts a low-capacitance diode array of model PJSR05, which is used to eliminate the influence of electrostatic discharge and provide overvoltage protection for devices on the bus.

Preferably, the power supply module adopts a CMOS linear voltage regulator modeled as RT9013.

The transmitting and receiving antenna is connected with the LoRa radio frequency module, and is used for sending electromagnetic waves to other LoRa devices, or receiving electromagnetic wave signals from other LoRa devices.

The utility model adopts LoRa modulation technology, which has the advantages of low power consumption, long transmission distance, and reliable communication. It can realize two-way data exchange with the host computer, instrumentation equipment, data acquisition equipment, etc. through the USB interface. It is useful in the field of remote Internet of things. It is widely used, and the technical realization is relatively simple, and the design cost is low.

Description of drawings

Fig. 1 is a circuit principle block diagram of a USB transponder based on LoRa modulation technology of the present invention.

Fig. 2 is a schematic diagram of the data forwarding process of a USB transponder based on the LoRa modulation technology of the present invention.

detailed description

The technical solution of the utility model will be described in detail below in conjunction with the accompanying drawings and embodiments, but the protection scope of the utility model is not limited thereto.

As shown in accompanying drawing 1, a kind of USB transponder based on LoRa modulation technology of the utility model includes USB bus protector, USB bus, USB module, communication indicator light, power supply module, MCU module, LoRa radio frequency module, transmitting and receiving antenna. The USB module is connected with the USB interface of the host computer or the acquisition device through the USB bus, and the USB bus is connected with the USB bus protector, and the USB module is also connected with the MCU through 8 data lines and control lines; the MCU Connect to the LoRa radio frequency module through the SPI serial port, the power supply module supplies power to the radio frequency module and MCU, and the LoRa radio frequency module is connected to the transmitting and receiving antenna. The USB module is also connected to a communication indicator light. The power supply module is connected to a 5V power supply through a USB interface.

The USB bus protector adopts low-voltage and low-capacitance transient protection device PJSR05 to protect the USB bus and MCU from electrostatic discharge and overvoltage.

The USB module uses a USB bus general-purpose device chip of the model CH372B to realize the exchange of external USB data and MCU data.

The power module adopts a CMOS linear voltage regulator model RT9013, which converts the 5V voltage input by the USB port into 3.3V voltage, and provides it to the MCU and LoRa RF module. RT9013 has the characteristics of low leakage, low noise, and fast.

The MCU module adopts STM8Lx ultra-low power microcontroller with SPI interface. Through programming, the MCU microcontroller communicates with external USB devices through the USB bus module, and communicates with the LoRa radio frequency module through the SPI interface, thereby realizing two-way data exchange between wireless data and USB device data.

The LoRa radio frequency module uses Semtech's SX12x radio frequency chip. The transmitting and receiving antenna is connected with the radio frequency chip, and is used for sending electromagnetic waves to wireless communication modules of other LoRa terminal equipment.

During the communication process, when there is data transmission on the USB bus, the communication indicator light flickers. When the device is connected to the bus, the communication indicator is always on.

As shown in accompanying drawing 2, a kind of USB transponder based on LoRa modulation technology of the present invention, its data forwarding process is divided into two directions of sending data and receiving data during its work:

The USB transponder sends data to the remote LoRa device: the local USB external device transmits the data to the USB transponder through the USB bus. The USB transponder sends data to the remote LoRa device through the LoRa RF module.

The USB transponder receives the data sent from the remote LoRa device: the remote system sends the data packet to the USB transponder through its embedded LoRa radio frequency module. The USB repeater forwards the received data to the local USB external device through the USB bus.

The aforementioned remote LoRa device can be either a host computer system with a built-in LoRa radio frequency module, or a USB transponder based on LoRa modulation and a terminal system such as a computer system that supports USB input.

Claims (8)

1. a kind of usb data transponder based on LoRa modulation techniques, it is characterised in that：It include USB module, usb bus, Usb bus protector, MCU, LoRa radio-frequency module, power module and transmitting reception antenna, described USB module are total by USB Line is connected with the USB interface of host computer or collecting device, and usb bus are connected with usb bus protector, and described USB module is also It is connected by 8 position datawires and control line with MCU；Described MCU is connected by SPI serial ports with LoRa radio-frequency modules, power supply mould Block is powered to radio-frequency module and MCU, and LoRa radio-frequency modules are connected with transmitting reception antenna.

2. the usb data transponder based on LoRa modulation techniques according to claim 1, it is characterised in that：Described USB Module is also connected with the indicator lamp that communicates.

3. the usb data transponder based on LoRa modulation techniques according to claim 1, it is characterised in that：Described electricity Source module connects 5V power supplys by USB interface.

4. the usb data transponder based on LoRa modulation techniques according to claim 1, it is characterised in that：Described MCU Using chip STM8Lx.

5. the usb data transponder based on LoRa modulation techniques according to claim 1, it is characterised in that：Described penetrates Frequency module uses chip SX12X.

6. the usb data transponder based on LoRa modulation techniques according to claim 1, it is characterised in that：Described USB Module uses chip CH372B.

7. the usb data transponder based on LoRa modulation techniques according to claim 1, it is characterised in that：Described USB Bus guardian uses the low di-cap array of model PJSR05.

8. the usb data transponder based on LoRa modulation techniques according to claim 1, it is characterised in that：Described electricity Source module uses the CMOS linear voltage regulators of model RT9013.