CN209841615U - Raise dust monitoring circuit board - Google Patents

Abstract

The utility model relates to a raise dust monitoring circuit board, include the circuit board and install microcontroller MCU on the circuit board, switching value acquisition unit, RS485 TLL optional circuit, RS485 level conversion circuit, RS232 TLL RS485 conversion optional circuit, USB changes serial ports circuit, input interface J4, third sensor interface J3, second sensor interface J2, first sensor interface J1, DCDC power conversion unit, switch JT 2. The utility model has the advantages that: the dust monitoring system has the advantages that the dust monitoring system is compatible with various sensor interface types, supports interfaces of wired and wireless connection Ethernet, conveniently expands various wireless communication interfaces, and based on the design, the dust monitoring system realizes high integration and universality of company dust monitoring products, improves flexibility, saves production time and improves sales volume.

Description

Raise dust monitoring circuit board

Technical Field

The utility model relates to a raise dust monitoring circuit board belongs to integrated circuit board technical field.

Background

With the increasing attention of the country to environmental protection in recent years, the rapid development of a new production industry is promoted by combining the rapid development of a big data technology, and the industry has strong policy and compelling property, namely environmental pollution monitoring, wherein the industry is named as raise dust monitoring, mainly relates to data monitoring of the concentration PM2.5/PM10 of polluted particles in air and conventional meteorological parameters (wind speed, wind direction, temperature, humidity and noise), and the country also encourages or even forces each place to establish a big data analysis platform for monitoring the construction of an evaluation system of the local environmental quality, and controls the production of local pollution type enterprises according to the evaluation result of the environmental quality.

With the rise of the industry, the market of sensors, detectors and LED display screens related at a time on the market is hot, but the interface types of the sensors are mixed, communication protocols are also not agreed, each family has standards, platform construction of each place is not standard, mutual butt joint is difficult, the market once has the situation of supply and demand shortage, the pressure of national policy documents is realized, and the immature market causes incompatibility and influences sale and capacity.

SUMMERY OF THE UTILITY MODEL

According to the not enough among the above prior art, the utility model discloses the technical problem who solves is: in order to solve one of the above problems, a dust monitoring circuit board is provided.

Raise dust monitoring circuit board, its characterized in that: comprises a circuit board, a microcontroller MCUU1, a switching value acquisition unit, an RS485/TLL selection circuit, an RS485 level conversion circuit, an RS232/TLL/RS485 conversion selection circuit, a USB serial port circuit, an input interface J4, a third sensor interface J3, a second sensor interface J2, a first sensor interface J1, a DCDC power conversion unit, a switch JT2, a DC input JT1, a LORA/ZIGBEE wireless module, a LORA/ZIGBEE expansion seat, a GPRS/NBIOT/WIFI wireless module, a GPRS/NBIOT/WIFI expansion seat U13, an Ethernet PHY unit, an RJ45 interface, a 12V output control circuit and a microUSB interface, wherein the output end of the switching value acquisition unit is connected with the input end of the microcontroller MCUU1, the input end of the switching value acquisition unit is connected with the input interface J4, and the input end of the 12V output control circuit is connected with the output end of the microcontroller MCUU1, the output end of the 12V output control circuit is connected to an input interface J4, the RS485/TLL selection circuit is respectively connected with a fifth UART interface UART5 of a third sensor interface J3, an RS485 level conversion circuit and a microcontroller MCUU1, the RS485 level conversion circuit is respectively connected with a second sensor interface J2, an RS232/TLL/RS485 conversion selection circuit and a sixth UART interface UART6 of the microcontroller MCUU1, the RS232/TLL/RS485 conversion selection circuit is respectively connected with a first sensor interface J1, a second UART interface UART2 and a third UART interface UART3 of the microcontroller MCUU1, the USB to serial port circuit is respectively connected with a first UART interface UART1 and a microUSB interface of the microcontroller MCUU1, the output end of the DC input JT1 is connected with a switch JT2, the output end of the switch JT 865 2 is connected with a DC power conversion unit, the output end of the DC power conversion unit is connected with the microcontroller MCUU 48323, and the ZIGBRA/UEE wireless extension module 1, The third UART interface UART3 of the MCUU1 is connected, the GPRS/NBIOT/WIFI wireless module is respectively connected with the GPRS/NBIOT/WIFI extension seat U13 and the fourth UART interface UART4, the ETHERNET interface of the microcontroller MCUU1 is connected with the Ethernet PHY unit, and the Ethernet PHY unit is connected with the RJ45 interface.

The raise dust monitoring circuit board further comprises a USB port and a FLASH interface, wherein the USB port is electrically connected with the microcontroller MCUU1, and the FLASH interface is connected with the FLASH interface through an SPI bus.

The raise dust monitoring circuit board further comprises a micro reset switch B1, wherein the micro reset switch B1 is electrically connected with the microcontroller MCUU 1.

The DCDC power supply conversion unit is used for converting an external power supply voltage into a voltage which can be used by the microcontroller MCUU1 and other functional units, and a power supply input socket corresponding to a DC input JT1 is arranged on the right side of the circuit board; a switch JT2 for connecting an external power supply with a circuit board, a capacitor C72 connected in parallel to the switch JT2 for eliminating an arc generated at the moment of connecting or disconnecting the switch, and prolonging the service life of the switch, and then entering a power conversion main chip U10 via a fuse F1, a diode D3, and a transient suppression diode TVS11, wherein the diode D3 mainly prevents the polarity of the external power supply from being reversed to damage a subsequent circuit, the transient suppression diode TVS11 prevents the subsequent circuit from being impacted when a high voltage pulse occurs in external power supply, C44 and C13 before the power conversion chip U10 are input filter capacitors, the power conversion chip U10 and peripheral devices D6 and L2 form a step-down conversion circuit to convert 12V voltage into 5V, the subsequent C70 and C69 are filter capacitors, the 5V output enters a power conversion chip U12 via D5 and F2, and C80, C82 is the input filter capacitor, and power conversion chip U12 is the 3.3V power system power supply conversion chip, converts 5V into 3.3, and C85, C84 are 3.3V's filter capacitor, for convenient debugging is test voltage, has increased TP1, TP2, TP3, TP4 test point.

The RS485 level conversion circuit, the power module U2 is an isolation power module, which provides power for the RS485 conversion chip U3, VDD _5V is output by the DC/DC circuit, another 5V power is output after passing through the power module U2, and completely isolated, TVS5 and TVS6 are protection diodes, the 485 conversion uses UART6 of MCU, the network of level is preferably RS485_ P, RS485_ N, the latter J1, J2 and J3 can be directly or indirectly output through a selection circuit, and can be flexibly configured and selected according to product requirements.

Compared with the prior art, the utility model discloses following beneficial effect has:

raise dust monitoring circuit board, have compatible multiple sensor interface type, support the interface of wired, wireless connection ethernet, convenient multiple wireless communication's of extension interface, fool's input/output binding post based on these designs, realized the high integrated nature of company's raise dust monitoring product, the commonality has improved the flexibility, practices thrift production time, has improved the sales volume, has brought higher profit for the company.

Drawings

FIG. 1 is a schematic diagram of the present invention;

FIG. 2 is a circuit diagram of a DCDC power conversion unit;

FIG. 3 is a circuit diagram of an RS485 level shift circuit;

FIG. 4 is a circuit diagram of an RS232/TLL/RS485 conversion selection circuit;

FIG. 5 is a circuit diagram of a 12V output control and switching value signal acquisition unit;

FIG. 6 is a circuit diagram of a GPRS/NBIOT/WIFI/LORA/ZIGBEE expansion circuit;

FIG. 7 is a USB to serial circuit diagram;

FIG. 8 is a circuit diagram of an Ethernet PHY unit;

FIG. 9 is a circuit diagram of a USB interface;

fig. 10 is a layout diagram of the circuit board of the present invention.

Detailed Description

The invention will be further described with reference to the accompanying drawings:

the present invention is further illustrated by the following specific examples, which are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included within the scope of the present invention.

Example one

As shown in fig. 1-10, the dust monitoring circuit board is characterized in that: comprises a circuit board, a microcontroller MCUU1, a switching value acquisition unit, an RS485/TLL selection circuit, an RS485 level conversion circuit, an RS232/TLL/RS485 conversion selection circuit, a USB serial port circuit, an input interface J4, a third sensor interface J3, a second sensor interface J2, a first sensor interface J1, a DCDC power conversion unit, a switch JT2, a DC input JT1, a LORA/ZIGBEE wireless module, a LORA/ZIGBEE expansion seat, a GPRS/NBIOT/WIFI wireless module, a GPRS/NBIOT/WIFI expansion seat U13, an Ethernet PHY unit, an RJ45 interface, a 12V output control circuit and a microUSB interface, wherein the output end of the switching value acquisition unit is connected with the input end of the microcontroller MCUU1, the input end of the switching value acquisition unit is connected with the input interface J4, and the input end of the 12V output control circuit is connected with the output end of the microcontroller MCUU1, the output end of the 12V output control circuit is connected to an input interface J4, the RS485/TLL selection circuit is respectively connected with a fifth UART interface UART5 of a third sensor interface J3, an RS485 level conversion circuit and a microcontroller MCUU1, the RS485 level conversion circuit is respectively connected with a second sensor interface J2, an RS232/TLL/RS485 conversion selection circuit and a sixth UART interface UART6 of the microcontroller MCUU1, the RS232/TLL/RS485 conversion selection circuit is respectively connected with a first sensor interface J1, a second UART interface UART2 and a third UART interface UART3 of the microcontroller MCUU1, the USB to serial port circuit is respectively connected with a first UART interface UART1 and a microUSB interface of the microcontroller MCUU1, the output end of the DC input JT1 is connected with a switch JT2, the output end of the switch JT 865 2 is connected with a DC power conversion unit, the output end of the DC power conversion unit is connected with the microcontroller MCUU 48323, and the ZIGBRA/UEE wireless extension module 1, The third UART interface UART3 of the MCUU1 is connected, the GPRS/NBIOT/WIFI wireless module is respectively connected with the GPRS/NBIOT/WIFI extension seat U13 and the fourth UART interface UART4, the ETHERNET interface of the microcontroller MCUU1 is connected with the Ethernet PHY unit, and the Ethernet PHY unit is connected with the RJ45 interface.

The raise dust monitoring circuit board further comprises a USB port and a FLASH interface, wherein the USB port is electrically connected with the microcontroller MCUU1, and the FLASH interface is connected with the FLASH interface through an SPI bus.

The raise dust monitoring circuit board further comprises a micro reset switch B1, wherein the micro reset switch B1 is electrically connected with the microcontroller MCUU 1.

The DCDC power supply conversion unit is used for converting an external power supply voltage into a voltage which can be used by the microcontroller MCUU1 and other functional units, and a power supply input socket corresponding to a DC input JT1 is arranged on the right side of the circuit board; a switch JT2 for connecting an external power supply with a circuit board, a capacitor C72 connected in parallel to the switch JT2 for eliminating an arc generated at the moment of connecting or disconnecting the switch, and prolonging the service life of the switch, and then entering a power conversion main chip U10 via a fuse F1, a diode D3, and a transient suppression diode TVS11, wherein the diode D3 mainly prevents the polarity of the external power supply from being reversed to damage a subsequent circuit, the transient suppression diode TVS11 prevents the subsequent circuit from being impacted when a high voltage pulse occurs in external power supply, C44 and C13 before the power conversion chip U10 are input filter capacitors, the power conversion chip U10 and peripheral devices D6 and L2 form a step-down conversion circuit to convert 12V voltage into 5V, the subsequent C70 and C69 are filter capacitors, the 5V output enters a power conversion chip U12 via D5 and F2, and C80, C82 is the input filter capacitor, and power conversion chip U12 is the 3.3V power system power supply conversion chip, converts 5V into 3.3, and C85, C84 are 3.3V's filter capacitor, for convenient debugging is test voltage, has increased TP1, TP2, TP3, TP4 test point.

The RS485 level conversion circuit, the power module U2 is an isolation power module, which provides power for the RS485 conversion chip U3, VDD _5V is output by the DC/DC circuit, another 5V power is output after passing through the power module U2, and completely isolated, TVS5 and TVS6 are protection diodes, the 485 conversion uses UART6 of MCU, the network of level is preferably RS485_ P, RS485_ N, the latter J1, J2 and J3 can be directly or indirectly output through a selection circuit, and can be flexibly configured and selected according to product requirements.

In practical application, some products adopt an RS232 level serial port communication mode, TTL is needed to be used in the future, and RS484 interfaces are used in the future. In order to adapt to different applications, three circuits for directly switching the level modes are designed. U1/R25/R26/R27/R28/R29/R30/R6/R7 in FIG. 4 are electrical elements for level selection, and the selection mode is as follows:

and (3) RS232 level output: welding U1, disassembling R25/R26/R27/R28;

and (3) TTL level output: the UART2 can be output in a TTL level form by disassembling U1/R6/R7, and the later mentioned ZIGBEE/LORA wireless extension module can use the UART3 in a TTL level form.

And (3) RS485 level output: u1 is disassembled, and welding R25/R26/R27/R28/R29/R30/R6/R7 can output RS485 level at the moment J1/J2/J3.

U8 in FIG. 5 is an optical coupler used to isolate external signal interference. R40, R64 are current-limiting resistors, guarantee that the opto-coupler can normally switch on and do not damage the chip when the switching signal arrives. R41/R63 are pull-up resistors, and when no external signal is input, the MCU is guaranteed to acquire high level. When a signal comes, the signal acquired by the MCU is at a low level.

The 12V output control is realized by U7, and the MCU outputs OUT1/OUT2 to J4 through CTR _ DO1/CTR _ DO2/CTR _ EN signal U7.

In order to meet the requirements of different communication schemes, the GPRS/NBIOT/WIFI/LORA/ZIGBEE expansion circuit is specially designed with a hardware circuit compatible with various wireless communication schemes, and in actual use, the wireless communication schemes can be switched by matching corresponding software without independently developing a circuit board.

The wireless expansion interface of fig. 6 is divided into two general designs, U11/U13 two connectors, wherein the ZIGBEE/LORA module uses UART3 for communication, and is also referred to as J1. The board has strong adaptability due to the design, and the universality is greatly improved. The GPRS expansion port uses UART4, and two expansion port layouts are in different positions, can use simultaneously, but GPRS/NB-IOT/WIFI internet connection, and short distance wireless network communication can be realized to ZIGBEE/LORA, realizes thing networking application function.

U4 in FIG. 7 is a USB-to-serial port chip, which realizes that a single chip microcomputer and a PC can be connected directly through a USB cable, saves intermediate conversion tools, realizes the upgrade of a canning machine of a program, and can be used as a program running information printout port to facilitate debugging and maintenance. The circuit also designs a USB port power supply design, and can supply power to the MCU through the USB to realize programming under the condition of not connecting with the external 12V.

Part of circuits are selected below the GPRS/NO-IOT/WIFI wireless communication expansion board during layout, and the space of the board is saved.

As shown in fig. 8, U15 is a PHY chip, and is used to implement a physical link layer of ethernet communication to implement wired network communication in cooperation with an external RJ45 interface.

As shown in fig. 9, Q1 and T1 constitute a USB device power supply control circuit, and power supply to the USB port is turned on by the USB _ BUS _ DRV signal when the MCU is initialized. The TVS9 and TVS10 are electrostatic protection chips, protecting the USB port from being damaged.

As shown in fig. 2, the power conversion unit is connected with an external DC terminal through JT1 to obtain a 12VDC power supply, JT2 is connected with an external ship-type switch, when the ship-type switch is turned on, the 12V power supply reaches a core conversion chip U10 of a 12 VDC-to-5 VDC circuit through a fuse F1, an anti-reverse diode D3 and a transient suppression diode TVS11, an LM2596-5.0 manufactured by TI company, the input voltage can reach 40V at most, the output voltage has a fixed voltage type such as 12V, 5V, 3.3V and the like, and also has a variable output type, the design adopts a 5V fixed output type, the output circuit can reach 3A at most, the application in the industrial field is very wide, and the chip of the type is also produced by a plurality of domestic chip manufacturers. The diode D6 and the energy storage filter inductors L2 and U10 form a BUCK BUCK conversion circuit, and finally 5V output is obtained, wherein the network label is VDD-5V.

VDD _5V goes through an isolation diode D5 and a self-recovery fuse F2 to a chip U12 of 5V to 3.3V part, BL11170-33CX version produced by Shanghai Beiling semiconductor company, which also has a plurality of fixed voltage versions and variable voltage output versions. 3.3V is output through the output filter capacitor C85/C84, and the network label is VDD _3V 3.

In order to facilitate the measurement after the circuit board is welded, a test point TP1 ~ TP4 is added.

The two power supply conversion function circuits can also be realized by using a power supply module, the effect is better, and the cost is improved by a plurality of times.

The function of converting 12VDC into 5VDC can realize converting 12V into 5V by using an isolated power module E2405UHBD-20W for remote electronic production of weekly work.

The function of 5VDC to 3.3VDC part can realize 5V to 3.3V by using an isolated power module ZY-0503FKS-2W for remote electronic production of Zhou Li Shuang.

FIG. 3 shows an RS485 conversion circuit

The core chip U3 of the RS485 level conversion circuit is an isolated industrial grade chip ADM2483BRW designed and produced by ADI semiconductor corporation in America. The RS485 level conversion circuit, the power module U2 is an isolation power module, which provides power for the RS485 conversion chip U3, VDD _5V is output by the DC/DC circuit, another 5V power is output after passing through the power module U2, and is completely isolated, TVS5 and TVS6 are protection diodes, the 485 conversion uses UART6 of MCU, and the network label of the level is RS485_ P, RS485_ N.

The function of fig. 3 can also be replaced by an RS485 transceiver module with isolation, and the performance is more reliable and more stable, such as RSM485PCHT produced by domestic remote electronic design. Of course, the price is also very high.

FIG. 4 is a circuit diagram of an RS232/TLL/RS485 conversion selection circuit

The function of converting TTL level of UART2/3 of MCU in FIG. 4 into RS232 level is realized by a core conversion chip U1, which is SP3232E designed and produced by Exar corporation, and UART2/3_ TX/UART2/3_ RX at MCU end is serial port signal of TTL level, and becomes T2/3_232_ TXD/T2/3_232_ RXD of 232 level after passing through SP32 3232E.

The U1 and peripheral electronic devices can be realized through an RS232 transceiver module, and the performance is more reliable and more stable, such as RSM232 produced by domestic remote electronic design. Of course, the price is also very high

In practical application, some products adopt an RS232 level serial port communication mode, TTL is needed to be used in the future, and RS484 interfaces are used in the future. In order to adapt to different applications, three circuits for directly switching the level modes are designed. U1/R25/R26/R27/R28/R29/R30/R6/R7 in FIG. 4 are electrical elements for level selection, and the selection mode is as follows:

and (3) RS232 level output: welding U1, disassembling R25/R26/R27/R28;

and (3) TTL level output: the UART2 can be output in a TTL level form by disassembling U1/R6/R7, and the later mentioned ZIGBEE/LORA wireless extension module can use the UART3 in a TTL level form.

And (3) RS485 level output: u1 is disassembled, and welding R25/R26/R27/R28/R29/R30/R6/R7 can output RS485 level at the moment J1/J2/J3.

Fig. 5 is a 12V output control and switching value signal acquisition circuit diagram, in which U8 is an optical coupler and TLP521-2 produced by toshiba semiconductor design is used for isolating external signal interference. R40, R64 are current-limiting resistors, guarantee that the opto-coupler can normally switch on and do not damage the chip when the switching signal arrives. R41/R63 are pull-up resistors, and when no external signal is input, the MCU is guaranteed to acquire high level. When a signal comes, the signal acquired by the MCU is at a low level. U7 is a 12V output control chip, and is realized by BTS3408G produced by the design of Yingfeing semiconductor, and controls the on-off of OUT1/2 and GND. The negative pole of an external load is connected to OUT1/2 through J4, the positive pole is connected with 12V, when the CTR _ OUT1/2 of the MCU outputs high level, OUT1/2 is connected with GND, the load supplies power to form a loop, and the load starts to work; on the contrary, when the CTR _ OUT1/2 of the MCU outputs a low level, the load power supply loop is cut off and stops working.

FIG. 6 shows two interface jacks for expansion of wireless communication modules, U11/U13 two connectors, respectively, wherein ZIGBEE/LORA modules communicate using UART3, also in common relationship with J1 as mentioned above. The board has strong adaptability due to the design, and the universality is greatly improved. The GPRS expansion port uses UART4, and two expansion port layouts are in different positions, can use simultaneously, but GPRS/NB-IOT/WIFI internet connection, and short distance wireless network communication can be realized to ZIGBEE/LORA, realizes thing networking application function.

Fig. 7 shows a USB port-to-serial port circuit, and the core conversion chip is implemented by CH340C produced by tokyo-kyn technology. The UART1_ TX/UART1_ RX is connected to the MCU, and the CH340D _ P/CH340D _ N is connected to the USB port of the external PC. After the chip driver of CH340C is installed on PC, serial communication between the circuit board and PC can be realized.

The circuit of fig. 7 may be omitted, and the above functions may be implemented by a common USB serial-to-serial port line on the market. The circuit mainly considers the on-site use convenience and selects an onboard USB to serial port.

The partial circuit is arranged below the GPRS/NO-IOT/WIFI wireless communication expansion board, so that the space of the board is saved.

Referring to fig. 8, PHY chip U5 for ethernet communication is a low cost PHY solution, model LAN8720A, offered by microcore (MicroCHIP) corporation of america, supporting RMII interface. The RMII interface used in this design communicates with the MCU. The RMII has 7 lines to realize data transmission, and the functions of the 7 lines are described in the following paragraphs:

RMII _ RX0/RX1/CRS _ DV: the MCU receives the data of the PHY, which is received from the Ethernet;

RMII _ TX0/TX1/EN MCU sends data to PHY;

RMII _ REF _ CLK provides the MCU with a MAC operating frequency of 50 MHz.

Since the number of pins of the LAN8720A is relatively small, many pins have multiple functions. Here i introduce several important settings.

1, PHY chip address setting

The LAN8720A may be configured by a PHYAD0 pin, which is multiplexed with an RXER pin, and has a pull-down resistor inside the chip, and after the hard reset is completed, the LAN8720A may read the level of the pin as the SMI address of the device, and when the pull-down resistor is connected (floating may be, because the pull-down resistor is provided inside the chip), set the SMI address to 0, and after the pull-up resistor is externally connected, set the SMI address to 1. We use this pin to float in this design, i.e. set the LAN8720 address to 0.

2, nINT/REFCLKO pin function configuration

The nINT/REFCLKO pin may be used as an interrupt output, or a reference clock output. The value of the pin LED2 is read by the LAN8720A after the chip is reset by setting the pin LED2 (nINTSEL), and when the pin is connected with a pull-up resistor (or floating, built-in pull-up resistor), the pin int/REFCLKO will be used as an interrupt output pin (REF _ CLKIN mode is selected) after normal operation. When the pin is connected with a pull-down resistor, the nINT/REFCLKO pin is used as a reference clock output (the REF _ CLK OUT mode is selected) after normal operation.

IN REF _ CLK IN mode, the external must provide a 50Mhz reference clock to the XTAL1 (CLKIN) pin of LAN 8720A. In REF _ CLK OUT mode, LAN8720A may be externally connected to a 25Mhz quartz crystal oscillator, frequency multiplied internally to 50Mhz, and then output a 50Mhz reference clock to the MAC controller via the refclk pin. In this way, the BOM cost may be reduced. In this design, we set the nINT/REFCLKO pin as the reference clock output (REF _ CLK OUT mode) for providing a 50Mhz reference clock to RMII of STM32F 4.

3, 1.2V internal regulator configuration LAN8720A requires 1.2V to supply VDDCR, but with the 1.2V regulator integrated on the chip, it can be configured by LED1(REGOFF) whether to use the internal regulator, and when the internal regulator is not used, it is necessary to supply 1.2V externally to the VDDCR pin. Here we use an internal regulator, so we connect a pull-down resistor (floating also, built-in) to the LED1 to control turning on the internal 1.2V regulator.

Referring to fig. 9, the power supply circuit of the USB port is mainly implemented by the partial circuit, and the USB _ N/USB _ P differential pair is directly connected to the MCU to implement reading and writing of the USB disk.

The USB _ VBUS is a power supply pin of the U disk device, the MCU controls the P-MOS tube IRLML6401 through the USB _ VBUS _ DRV signal, when the MCU carries out hardware initialization, the USB _ VBUS _ DRV signal is pulled high and converted into a low level through the triode T1, and therefore the P-MOS tube is conducted, and the USB _ VBUS is communicated with VDD _ 5V.

During the normal running of the program, if the USB flash disk is inserted, the USB flash disk can be identified by the MCU in the power supply state, and then corresponding read-write operation is carried out.

Circuit board function

1, 1 RS485 interface, 6 485 sensors can be directly connected at most;

2, 2 paths of RS232/TTL switchable serial ports are multiplexed with a 485 output interface;

3, 1 path of USB interface for reading and writing USB disk files;

4, 2 switching value input interfaces;

6, 2 paths of 12V @0.5A control output;

7, 1-way Ethernet RJ45 interface

8, 1 line sequence information printing output interface;

9 supporting the GPRS/NBIOT/LORA/ZIGBEE/WIFII module of the company;

performance indexes are as follows:

power supply range of 9 ~ 36Vdc

Working current: 1.5A Max

The working temperature range is-20 ℃ ~ 55 DEG C

Working humidity range of 0 ~ 95% no condensation

The size of the circuit board is as follows: 215mm x 120mm

The basic principles, main features and advantages of the present invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (3)

1. The utility model provides a raise dust monitoring circuit board which characterized in that: comprises a circuit board and a microcontroller MCU (U1), a switching value acquisition unit, an RS485/TLL selection circuit, an RS485 level conversion circuit, an RS232/TLL/RS485 conversion selection circuit, a USB serial port circuit, an input interface (J4), a third sensor interface (J3), a second sensor interface (J2), a first sensor interface (J1), a DCDC power conversion unit, a switch (JT 2), a DC input (JT 1), a LORA/ZIGBEE wireless module, a LORA/ZIGBEE expansion seat, a GPRS/NBIOT/WIFI wireless module, a GPRS/NBIOT/WIFI expansion seat (U13), an Ethernet PHY unit, an RJ45 interface, a 12V output control circuit and a microUSB interface, wherein the output end of the switching value acquisition unit is connected with the input end of the microcontroller MCU (U1), the input end of the switching value acquisition unit is connected with the input end of the input interface (J4), and the input end of the 12V output control circuit is connected with the output end of the microcontroller (U1), the output end of the 12V output control circuit is connected to an input interface (J4), the RS485/TLL selection circuit is respectively connected with a third sensor interface (J3), an RS485 level conversion circuit and a fifth UART interface UART5 of a microcontroller MCU (U1), the RS485 level conversion circuit is respectively connected with a second sensor interface (J2), an RS232/TLL/RS485 conversion selection circuit and a sixth UART interface UART6 of the microcontroller MCU (U1), the RS232/TLL/RS485 conversion selection circuit is respectively connected with a first sensor interface (J1), a second UART interface UART2 and a third UART interface UART3 of the microcontroller MCU (U1), the USB to serial port circuit is respectively connected with a first UART interface 1 and a microUSB interface of the microcontroller MCU (U1), the output end of a DC input (JT 1) is connected with a switch (MCU 2), the output end of the switch (JT 2) is connected with a DC power supply conversion unit, and the output end of a DCDC conversion unit (U1) of the microcontroller MCU 1 is connected with a U1, the LORA/ZIGBEE wireless module is respectively connected with a LORA/ZIGBEE extension seat and a third UART interface UART3 of an MCU (U1), the GPRS/NBIOT/WIFI wireless module is respectively connected with a GPRS/NBIOT/WIFI extension seat (U13) and a fourth UART interface UART4, an ETHERNET interface of the microcontroller MCU (U1) is connected with an Ethernet PHY unit, and the Ethernet PHY unit is connected with an RJ45 interface.

2. A dust monitoring circuit board according to claim 1, wherein: the USB interface is electrically connected with the MCU (U1), and the FLASH interface is connected with the FLASH interface through the SPI bus.

3. A dust monitoring circuit board according to claim 2, wherein: the micro-motion reset switch device further comprises a micro-motion reset switch B1, and the micro-motion reset switch B1 is electrically connected with the microcontroller MCU (U1).