CN213181357U - Digital dissolved oxygen electrode - Google Patents
Digital dissolved oxygen electrode Download PDFInfo
- Publication number
- CN213181357U CN213181357U CN202021121171.7U CN202021121171U CN213181357U CN 213181357 U CN213181357 U CN 213181357U CN 202021121171 U CN202021121171 U CN 202021121171U CN 213181357 U CN213181357 U CN 213181357U
- Authority
- CN
- China
- Prior art keywords
- circuit
- interface
- resistor
- pin
- power supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The utility model discloses a digital dissolved oxygen electrode, including the chip, the chip comprises system control circuit, power supply circuit, analog signal processing circuit and communication interface circuit, system control circuit is connected with power supply circuit, communication interface circuit, analog signal processing circuit respectively, power supply circuit and analog signal processing circuit, communication interface circuit are connected, analog signal processing circuit includes DO signal acquisition circuit and temperature signal acquisition circuit. The utility model discloses with adopting built-in chip, place the electrode shell in with the chip in, need not join in marriage in addition the instrument, only need with traditional electrode the same, direct input use can, adopt digital communication, theoretical transmission distance can reach 1 kilometer, the power supply adopts the direct current, greatly reduced receives external disturbance's probability. The utility model discloses a traditional instrument has been replaced to built-in digital chip, and is with low costs, and the consumption is little, simple to operate, and transmission distance is far away, and the output signal error is little, and anti-interference and compatibility are good.
Description
Technical Field
The utility model relates to an electrode technical field especially relates to a digit dissolved oxygen electrode, is applied to breed, environmental protection, water supply.
Background
The traditional electrode generally needs to be additionally provided with a secondary display instrument for operation, and the cost is higher. The secondary instrument can only output analog current signals generally, and the transmission distance is short and generally not more than 50 meters; and the longer the transmission distance, the larger the deviation of the signal receiving end. During field installation, the instrument needs the trompil to be fixed to the instrument itself is easily influenced by site environment's interference and is caused the instrument and show unusually, and a signal receiver need be equipped with alone to many instruments. In summary, the conventional electrode needs an additional meter, has high cost, short signal transmission distance and is easily interfered.
SUMMERY OF THE UTILITY MODEL
To the shortcoming of above-mentioned prior art, the utility model aims at providing a digit dissolved oxygen electrode adopts 485 communications to increase digital output function, has strengthened the interference killing feature in the transmission simultaneously greatly.
In order to solve the technical problem, the utility model discloses a following technical scheme:
the utility model provides a digital dissolved oxygen electrode, includes the chip, the chip comprises system control circuit, power supply circuit, analog signal processing circuit and communication interface circuit, system control circuit is connected with power supply circuit, communication interface circuit, analog signal processing circuit respectively, power supply circuit and analog signal processing circuit, communication interface circuit are connected, analog signal processing circuit includes DO signal acquisition circuit and temperature signal acquisition circuit.
Preferably, IN the above digital dissolved oxygen electrode, the system control circuit includes a main control chip U100, the main control chip U100 includes 6 pins, the first pin is a power supply of the system control circuit, the second pin AD _ IN5 is an input interface of an analog-to-digital converter and is connected to the temperature signal acquisition circuit, the third pin AD _ IN6 is an input interface of an analog-to-digital converter and is connected to the DO signal acquisition circuit, the fourth pin UART _ TX is a universal serial interface transmitting terminal and is connected to the communication interface circuit, the fifth pin UART _ RX is a universal serial interface receiving terminal and is connected to the communication interface circuit, and the sixth pin PC4 is a data communication direction control terminal and is connected to the communication interface circuit.
Preferably, in the above digital oxygen dissolving electrode, the communication interface circuit includes a half-duplex transceiver U200, the half-duplex transceiver U200 includes 7 pins, the first pin VCC1 is a power supply for the communication interface circuit, the second pin TXD is a usb transmitting end and is connected to a fourth pin UART _ TX of the system control circuit, the third pin RXD is a usb receiving end and is connected to a fifth pin UART _ RX of the system control circuit, the fourth pin DE is a communication interface circuit direction selecting end and is connected to a sixth pin PC4 of the system control circuit, the fifth pin VCC2 is a power supply for the communication interface circuit, an interface protection circuit D1 and a data transmission interface P1 connected in parallel are disposed between the sixth pin and the seventh pin, the data transmission interface P1 is provided with a first input port and a second input port, a first resistor R1 and a second resistor R2 which are connected in parallel are arranged between the interface protection circuit D1 and the data transmission interface P1, the first resistor R1 is connected with a first input port of the data transmission interface P1 through a 485 interface signal line A, and the second resistor R2 is connected with a second input port of the P1 through a 485 interface signal line B.
Preferably, in the above digital dissolved oxygen electrode, the power supply circuit includes a power supply interface P2, a diode D2, a first voltage-reducing and voltage-stabilizing circuit U1 and a second voltage-reducing and voltage-stabilizing circuit U2, the power supply interface P2 includes a first input port and a second input port, the first input port is connected to a power supply of the digital dissolved oxygen electrode and is connected to an input terminal of a first voltage-reducing and voltage-stabilizing circuit U1 after being connected in series with a diode D2, the second input port is grounded, an output terminal of the first voltage-reducing and voltage-stabilizing circuit U1 outputs VCC2_5V power to the communication interface circuit and is connected to an input terminal of a second voltage-reducing and voltage-stabilizing circuit U2, and an output terminal of the second voltage-reducing and voltage-stabilizing circuit U2 outputs VCC3V3 power to the control.
Preferably, in the above digital dissolved oxygen electrode, the DO signal acquisition circuit includes a DO sensor signal input interface P3, a first operational amplifier U3, a third resistor R3, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first capacitor C1, and a DO sensor signal DO _ ADC received by the main control chip U100, a power supply VCC3V3 of the DO signal acquisition circuit is connected to the eighth resistor R8 and the ninth resistor R9 and then grounded, an excitation voltage is generated at a connection point of the eighth resistor R8 and the ninth resistor R9 through voltage division and connected to an input positive terminal of the first operational amplifier U3, the DO sensor signal input interface P3 includes a first interface and a second interface, the first interface is grounded, the second interface is connected to an input terminal of the first operational amplifier U3, a seventh resistor R7 is disposed between an input terminal of the first operational amplifier U3 and an output terminal of the first operational amplifier U3, the output of the first operational amplifier U3 circuit is filtered by a filter circuit composed of a third resistor R3 and a first capacitor C1 to form a DO sensor signal DO _ ADC, and the DO sensor signal DO _ ADC is connected to a third pin AD _ IN6 of the system control circuit.
Preferably, in the above digital dissolved oxygen electrode, the temperature signal acquisition circuit includes a temperature sensor signal input interface P4, a fourth resistor R4, a sixth resistor R6, a second operational amplifier U4, a second capacitor C2, and a temperature sensor signal Rt _ ADC received by the main control chip U100, the temperature sensor signal input interface P4 includes a third interface and a fourth interface, the third interface being connected to ground, the fourth interface is connected with a temperature signal acquisition circuit power supply VCC3V3 after being connected with a sixth resistor R6 in series, the voltage generated by voltage division and related to the temperature resistance to be measured is connected to the input positive terminal of a second operational amplifier U4, and after the voltage is output by a circuit of the second operational amplifier U4, then forms a temperature sensor signal Rt _ ADC through a filter circuit consisting of a fourth resistor R4 and a second capacitor C2, the temperature sensor signal Rt _ ADC is connected to a second pin AD _ IN5 of the system control circuit.
Compared with the prior art, the utility model discloses with adopting built-in chip, place the electrode shell in with the chip in, need not join in marriage in addition the instrument, only need with traditional electrode the same, direct input use can, adopt digital communication, theoretical transmission distance can reach 1 kilometer. The power supply adopts direct current, thereby greatly reducing the probability of being interfered by the outside. The utility model discloses a traditional instrument has been replaced to built-in digital chip, and is with low costs, and the consumption is little, simple to operate, and transmission distance is far away, and the output signal error is little, and anti-interference and compatibility are good.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings, so as to fully understand the objects, the features and the effects of the present invention.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive effort.
FIG. 1: the embodiment of the utility model provides a digital dissolved oxygen electrode circuit composition structure sketch map;
FIG. 2: the embodiment of the utility model provides a system control circuit and communication interface circuit connection structure sketch map;
FIG. 3: the embodiment of the utility model provides a power circuit structure sketch map;
FIG. 4: the embodiment of the utility model provides a DO signal acquisition circuit structure sketch map;
FIG. 5: the embodiment of the utility model provides a temperature signal acquisition circuit schematic diagram.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The embodiments of the present invention will be described in further detail with reference to the drawings attached to the specification.
As shown in fig. 1, the utility model provides a pair of digital dissolved oxygen electrode, which comprises a chip, the chip comprises system control circuit 1, power supply circuit 2, analog signal processing circuit 3 and communication interface circuit 4, system control circuit 1 is connected with power supply circuit 2, communication interface circuit 4, analog signal processing circuit 3 respectively, power supply circuit 2 is connected with analog signal processing circuit 3, communication interface circuit 4, analog signal processing circuit 3 includes DO signal acquisition circuit 31 and temperature signal acquisition circuit 32.
As shown IN fig. 2, system control circuit 1 includes main control chip U100, main control chip U100 includes 6 pins, first pin is system control circuit 1 power supply, second pin AD _ IN5 is analog to digital converter input interface to be connected with temperature signal acquisition circuit 32, third pin AD _ IN6 is analog to digital converter input interface to be connected with DO signal acquisition circuit 31, fourth pin UART _ TX is the universal serial interface sending end to be connected with communication interface circuit 4, fifth pin UART _ RX is the universal serial interface receiving terminal to be connected with communication interface circuit 4, sixth pin PC4 is data communication direction control end to be connected with communication interface circuit 4.
Preferably, the fourth pin UART _ TX of the system control circuit 1 is connected with the communication interface circuit 4 through TX485 communication, the fifth pin UART _ RX is connected with the communication interface circuit 4 through RX485 communication, and the sixth pin PC4 is connected with the communication interface circuit 4 through EN485 communication. The utility model discloses a 485 communication increases the digital output function, has strengthened the interference killing feature in the transmission simultaneously greatly.
As shown in fig. 2, the communication interface circuit 4 of the present invention includes a half-duplex transceiver U200, the half-duplex transceiver U200 includes 7 pins, the first pin VCC1 is used for supplying power to the communication interface circuit 4, the second pin TXD is used for transmitting usb, and is connected to the fourth pin UART _ TX of the system control circuit 1, the third pin RXD is used for receiving usb and is connected to the fifth pin UART _ RX of the system control circuit 1, the fourth pin DE is used for selecting direction of the communication interface circuit and is connected to the sixth pin PC4 of the system control circuit 1, the fifth pin VCC2 is used for supplying power to the communication interface circuit 4, a parallel connection of an interface protection circuit D1 and a data transmission interface P1 is provided between the sixth pin and the seventh pin, the data transmission interface P1 is provided with a first input port and a second input port, a first resistor R1 and a second resistor R2 which are connected in parallel are arranged between the interface protection circuit D1 and the data transmission interface P1, the first resistor R1 is connected with a first input port of the data transmission interface P1 through a 485 interface signal line A, and the second resistor R2 is connected with a second input port of the P1 through a 485 interface signal line B.
As shown in fig. 3, power supply circuit 2 includes power supply interface P2, diode D2, first step-down voltage stabilizing circuit U1 and second step-down voltage stabilizing circuit U2, power supply interface P2 includes first input port and second input port, first input port connects digit dissolved oxygen electrode power supply and is connected to first step-down voltage stabilizing circuit U1's input after establishing ties with diode D2, second input port ground connection, first step-down voltage stabilizing circuit U1's output VCC2_5V power is provided for communication interface circuit to be connected to second step-down voltage stabilizing circuit U2's input, second step-down voltage stabilizing circuit U2's output VCC3V3 power is provided for control circuit, communication interface circuit and analog signal processing circuit.
As shown in fig. 4, the DO signal collecting circuit 31 of the present invention includes a DO sensor signal input interface P3, a first operational amplifier U3, a third resistor R3, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first capacitor C1, and a DO sensor signal DO _ ADC received by the main control chip U100, wherein the analog signal processing circuit power supply VCC3V3 is connected to the eighth resistor R8 and the ninth resistor R9 and then grounded, an excitation voltage is generated at the connection between the eighth resistor R8 and the ninth resistor R9 through voltage division and connected to the input positive terminal of the first operational amplifier U3, the DO sensor signal input interface P3 includes a first interface and a second interface, the first interface is grounded, the second interface is connected to the input negative terminal of the first operational amplifier U3, a seventh resistor R7 is disposed between the input negative terminal of the first operational amplifier U3 and the output terminal of the first operational amplifier U3, the output of the first operational amplifier U3 is filtered by a filter circuit composed of a third resistor R3 and a first capacitor C1 to form a DO sensor signal DO _ ADC, and the DO sensor signal DO _ ADC is connected to a third pin AD _ IN6 of the system control circuit 1.
Preferably, the seventh resistor R7 is disposed between the negative input terminal of the first operational amplifier U3 and the output terminal of the first operational amplifier U3, so that a voltage related to the current is generated at the output terminal of the first operational amplifier U3, and the voltage is filtered by the filter circuit formed by the third resistor R3 and the first capacitor C1 to form the DO sensor signal DO _ ADC.
As shown in fig. 5, the temperature signal collecting circuit 32 of the present invention includes a temperature sensor signal input interface P4, a fourth resistor R4, a sixth resistor R6, a second operational amplifier U4, a second capacitor C2, and a temperature sensor signal Rt _ ADC received by the main control chip U100, the temperature sensor signal input interface P4 includes a third interface and a fourth interface, the third interface being connected to ground, the fourth interface is connected with a temperature signal acquisition circuit power supply VCC3V3 after being connected with a sixth resistor R6 in series, the voltage generated by voltage division and related to the temperature resistance to be measured is connected to the input positive terminal of a second operational amplifier U4, and after the voltage is output by a circuit of the second operational amplifier U4, then forms a temperature sensor signal Rt _ ADC through a filter circuit consisting of a fourth resistor R4 and a second capacitor C2, the temperature sensor signal Rt _ ADC is connected to the second pin AD _ IN5 of the system control circuit 1.
To sum up, the utility model discloses a built-in chip need not join in marriage in addition the instrument, and the cost is reduced supplies power and uses the direct current instead, reduces the interference risk.
While the preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (6)
1. The digital dissolved oxygen electrode is characterized by comprising a chip, wherein the chip consists of a system control circuit, a power supply circuit, an analog signal processing circuit and a communication interface circuit, the system control circuit is respectively connected with the power supply circuit, the communication interface circuit and the analog signal processing circuit, the power supply circuit is connected with the analog signal processing circuit and the communication interface circuit, and the analog signal processing circuit comprises a DO signal acquisition circuit and a temperature signal acquisition circuit.
2. The digital dissolved oxygen electrode of claim 1, wherein the system control circuit comprises a main control chip U100, the main control chip U100 comprises 6 pins, the first pin of the main control chip U100 is used for providing power for the system control circuit, the second pin AD _ IN5 of the main control chip U100 is used as an input interface of an analog-to-digital converter and is connected with the temperature signal acquisition circuit, the third pin AD _ IN6 of the main control chip U100 is used as an input interface of the analog-to-digital converter and is connected with the DO signal acquisition circuit, the fourth pin UART _ TX of the main control chip U100 is used as a transmitting end of a universal serial interface and is connected with the communication interface circuit, the fifth pin UART _ RX of the main control chip U100 is used as a receiving end of the universal serial interface and is connected with the communication interface circuit, the sixth pin PC4 of the main control chip U100 is used as a control end of data communication direction, and is connected to the communication interface circuit.
3. The digital dissolved oxygen electrode of claim 2, wherein: the communication interface circuit comprises a half-duplex transceiver U200, the half-duplex transceiver U200 comprises 7 pins, a first pin VCC1 of the half-duplex transceiver U200 is used for supplying power to the communication interface circuit, a second pin TXD of the half-duplex transceiver U200 is used for sending a universal serial interface and is connected with a fourth pin UART _ TX of the main control chip U100, a third pin RXD of the half-duplex transceiver U200 is used for receiving a universal serial interface and is connected with a fifth pin UART _ RX of the main control chip U100, a fourth pin DE of the half-duplex transceiver U200 is used for selecting the direction of the communication interface circuit and is connected with a sixth pin PC4 of the main control chip U100, a fifth pin VCC2 of the half-duplex transceiver U200 is used for supplying power to the communication interface circuit, and an interface protection circuit D1 and a data transmission interface P1 which are connected in parallel are arranged between the sixth pin of the half-duplex transceiver U200 and the seventh pin of the half-duplex transceiver U200, the data transmission interface P1 is provided with a first input port and a second input port, a first resistor R1 and a second resistor R2 which are connected in parallel are arranged between the interface protection circuit D1 and the data transmission interface P1, the first resistor R1 is connected with the first input port of the data transmission interface P1 through a 485 interface signal line A, and the second resistor R2 is connected with the second input port of the P1 through a 485 interface signal line B.
4. The digital dissolved oxygen electrode of claim 3, wherein: the power supply circuit comprises a power supply interface P2, a diode D2, a first voltage reduction and voltage stabilization circuit U1 and a second voltage reduction and voltage stabilization circuit U2, wherein the power supply interface P2 comprises a first input port and a second input port, the first input port is connected with a digital dissolved oxygen electrode power supply and is connected with an input end of a first voltage reduction and voltage stabilization circuit U1 after being connected with a diode D2 in series, the second input port is grounded, the output end of the first voltage reduction and voltage stabilization circuit U1 outputs a VCC2_5V power supply to be provided for the communication interface circuit and is connected to the input end of a second voltage reduction and voltage stabilization circuit U2, and the output end of the second voltage reduction and voltage stabilization circuit U2 outputs a VCC3V3 power supply to be provided for the control circuit, the.
5. The digital dissolved oxygen electrode of claim 4, wherein: the DO signal acquisition circuit comprises a DO sensor signal input interface P3, a first operational amplifier U3, a third resistor R3, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first capacitor C1 and a DO sensor signal DO _ ADC received by the main control chip U100, a power supply VCC3V3 of the DO signal acquisition circuit is connected with an eighth resistor R8 and a ninth resistor R9 and then grounded, an excitation voltage is generated at the connection position of the eighth resistor R8 and the ninth resistor R9 through voltage division and is connected to the input positive terminal of the first operational amplifier U3, the DO sensor signal input interface P3 comprises a first interface and a second interface, the first interface is grounded, the second interface is connected with the input negative terminal of the first operational amplifier U3, a seventh resistor R7 is arranged between the input negative terminal of the first operational amplifier U3 and the output terminal of the first operational amplifier U3, and a third DO output resistor U4642 and a filtering circuit form a DO _ ADC filtering circuit through a third resistor 1 A sensor signal DO _ ADC connected to the third pin AD _ IN6 of the main control chip U100.
6. The digital dissolved oxygen electrode of claim 5, wherein: the temperature signal acquisition circuit comprises a temperature sensor signal input interface P4, a fourth resistor R4, a sixth resistor R6, a second operational amplifier U4, a second capacitor C2 and a temperature sensor signal Rt _ ADC received by the main control chip U100, the temperature sensor signal input interface P4 comprises a third interface and a fourth interface, the third interface is grounded, the fourth interface is connected with a power supply VCC3V3 of the temperature signal acquisition circuit after being connected with the sixth resistor R6 IN series, voltage generated by voltage division and related to a measured temperature resistor is connected to the input positive end of the second operational amplifier U4, the voltage is output by a second operational amplifier U4 circuit and then forms a temperature sensor signal Rt _ ADC through a filter circuit formed by the fourth resistor R4 and the second capacitor C2, and the temperature sensor signal Rt _ ADC is connected with a second pin AD _ IN5 of the main control chip U100.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021121171.7U CN213181357U (en) | 2020-06-17 | 2020-06-17 | Digital dissolved oxygen electrode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021121171.7U CN213181357U (en) | 2020-06-17 | 2020-06-17 | Digital dissolved oxygen electrode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213181357U true CN213181357U (en) | 2021-05-11 |
Family
ID=75789051
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021121171.7U Active CN213181357U (en) | 2020-06-17 | 2020-06-17 | Digital dissolved oxygen electrode |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213181357U (en) |
-
2020
- 2020-06-17 CN CN202021121171.7U patent/CN213181357U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN213814657U (en) | Adapter for converting RS232 serial port into CAN bus interface | |
| CN202979095U (en) | Two-bus type fire-fighting telephone system | |
| CN212229455U (en) | Digital PH electrode | |
| CN107395243A (en) | A kind of single-wire communication circuit | |
| CN201562357U (en) | Data concentrator of automatic meter reading system | |
| CN213181357U (en) | Digital dissolved oxygen electrode | |
| CN209044858U (en) | GPRS signal extender, power information acquisition terminal and its system of power information acquisition terminal based on plastic optical fiber | |
| CN213181771U (en) | Digital conductivity electrode | |
| CN219181516U (en) | Data transmission equipment | |
| CN210242785U (en) | Split type monitoring system | |
| CN217133574U (en) | High-integration integrated data acquisition device | |
| CN210666423U (en) | Multifunctional data acquisition wireless remote transmission device applied to intelligent water meter | |
| CN205722190U (en) | A kind of intelligent electric energy meter of radio communication pre paid functionality | |
| CN210802495U (en) | Magnetic encoder | |
| CN204465545U (en) | A kind of based on monolithic processor controlled communication system | |
| CN209472618U (en) | The wireless communication module of ammeter | |
| CN210271205U (en) | Remote household security device | |
| CN210161930U (en) | Novel fill electric pile | |
| CN103065117A (en) | Bluetooth scanning gun | |
| CN203537377U (en) | Wireless communication device with multiple interfaces | |
| CN208156199U (en) | positioning and communication system based on SIM868 | |
| CN221686943U (en) | Single bus conversion circuit for industrial communication | |
| CN205901735U (en) | Power line carrier communication device suitable for printer | |
| CN217445352U (en) | Single-wire serial port communication circuit used between different ground potential reference devices | |
| CN218825252U (en) | Single-handle control panel integrating CAN communication |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |