CN212229455U - Digital PH electrode - Google Patents
Digital PH electrode Download PDFInfo
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- CN212229455U CN212229455U CN202021121159.6U CN202021121159U CN212229455U CN 212229455 U CN212229455 U CN 212229455U CN 202021121159 U CN202021121159 U CN 202021121159U CN 212229455 U CN212229455 U CN 212229455U
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Abstract
The utility model discloses a digit PH electrode, including the chip, the chip comprises system control circuit, power supply circuit, analog signal processing circuit and communication interface circuit, and system control circuit is connected with power supply circuit, communication interface circuit, analog signal processing circuit respectively, and power supply circuit and analog signal processing circuit, communication interface circuit are connected, and analog signal processing circuit includes PH 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 PH 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 the prior art, the utility model aims at providing a digit PH electrode adopts 485 communication 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 digit PH 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 PH signal acquisition circuit and temperature signal acquisition circuit.
Preferably, IN the above-mentioned digital PH electrode, system control circuit includes main control chip U100, main control chip U100 includes 6 pins, first pin is system control circuit power supply, second pin AD _ IN5 is analog to digital converter input interface to be connected with temperature signal acquisition, third pin AD _ IN6 is analog to digital converter input interface to be connected with PH signal acquisition circuit, fourth pin UART _ TX is universal serial interface sending terminal to be connected with communication interface circuit, fifth pin UART _ RX is universal serial interface receiving terminal to be connected with communication interface circuit, sixth pin PC4 is data communication direction control end to be connected with communication interface circuit.
Preferably, in the digital PH 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 digital PH 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 third input port and a fourth input port, the third input port is connected to a digital electrode power supply and is connected to an input end of the first voltage-reducing and voltage-stabilizing circuit U1 after being connected in series with the diode D2, the fourth input port is grounded, an output power of the output end of the first voltage-reducing and voltage-stabilizing circuit U1 is provided to the communication interface circuit and is connected to an input end of the second voltage-reducing and voltage-stabilizing circuit U2, and an output power of the output end of the second voltage-reducing and voltage-stabilizing circuit U2 is.
Preferably, IN the digital PH electrode, the PH signal acquisition circuit includes a PH sensor signal input interface P3, a first operational amplifier U3, a third resistor R3, a fifth resistor R5, a first capacitor C1, and a PH sensor signal PH _ ADC received by the main control chip U100, the PH 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 positive terminal of the first operational amplifier U3 after passing through the fifth resistor R5, and then is filtered by a filter circuit composed of the third resistor R3 and the first capacitor C1 after being output by the first operational amplifier U3 circuit to form the PH sensor signal PH _ ADC, and the PH sensor signal PH _ ADC is connected to a third pin AD _ IN6 of the system control circuit.
Preferably, in the digital PH 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 PH 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 an analog signal processing 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 embodiment of the utility model provides a pair of digit PH 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. Preferably, the analog signal processing circuit 3 comprises a PH signal acquisition circuit 31 and a 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 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 PH signal acquisition circuit 31, fourth pin UART _ TX is the universal serial interface sending end, and is 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 third input port and fourth input port, the third input port connects digital electrode power supply and is connected to first step-down voltage stabilizing circuit U1's input after establishing ties with diode D2, fourth input port ground connection, communication interface circuit 4 is provided to first step-down voltage stabilizing circuit U1's output power to be connected to second step-down voltage stabilizing circuit U2's input, system control circuit 1, communication interface circuit 4 and analog signal processing circuit 3 are provided to second step-down voltage stabilizing circuit U2's output power.
As shown IN fig. 4, PH sensor signal PH _ ADC that PH signal acquisition circuit 31 includes PH sensor signal input interface P3, first operational amplifier U3, third resistance R3, fifth resistance R5, first electric capacity C1 and main control chip U100 and accept, PH sensor signal input interface P3 includes first interface and second interface, first interface ground connection, the second interface inserts first operational amplifier U3's input positive terminal behind fifth resistance R5, then forms PH sensor signal PH _ ADC after the filtering circuit filtering of third resistance R3 and first electric capacity C1 constitution behind first operational amplifier U3 circuit output, PH sensor signal PH _ ADC is connected with third pin AD _ IN6 of system control circuit 1.
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 utility model provides a digit PH electrode, its characterized in that, 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 PH signal acquisition circuit and temperature signal acquisition circuit.
2. The digital PH 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 is a power supply of the system control circuit, the second pin AD _ IN5 is an analog-to-digital converter input interface and is connected with temperature signal acquisition, the third pin AD _ IN6 is an analog-to-digital converter input interface and is connected with a PH signal acquisition circuit, the fourth pin UART _ TX is a universal serial interface sending end and is connected with a communication interface circuit, the fifth pin UART _ RX is a universal serial interface receiving end and is connected with the communication interface circuit, and the sixth pin PC4 is a data communication direction control end and is connected with the communication interface circuit.
3. The digital PH 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 is a power supply of the communication interface circuit, a second pin TXD is a universal serial interface sending end and is connected with a fourth pin UART _ TX of a system control circuit, a third pin RXD is a universal serial interface receiving end and is connected with a fifth pin UART _ RX of the system control circuit, a fourth pin DE is a communication interface circuit direction selection end and is connected with a sixth pin PC4 of the system control circuit, a fifth pin VCC2 is a power supply of the communication interface circuit, an interface protection circuit D1 and a data transmission interface P1 which are connected in parallel are arranged between the sixth pin and the seventh pin, a first input port and a second input port are arranged on the data transmission interface P1, 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 PH electrode of claim 1, 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 third input port and a fourth input port, the third input port is connected with a digital electrode power supply and is connected with the input end of a first voltage reduction and voltage stabilization circuit U1 after being connected with a diode D2 in series, the fourth input port is grounded, an output power supply of the output end of the first voltage reduction and voltage stabilization circuit U1 is provided for the communication interface circuit and is connected to the input end of a second voltage reduction and voltage stabilization circuit U2, and an output power supply of the output end of a second voltage reduction and voltage stabilization circuit U2 is provided for the system control circuit, the.
5. The digital PH electrode of claim 3, wherein: the PH signal acquisition circuit comprises a PH sensor signal input interface P3, a first operational amplifier U3, a third resistor R3, a fifth resistor R5, a first capacitor C1 and a PH sensor signal PH _ ADC accepted by a main control chip U100, wherein the PH sensor signal input interface P3 comprises a first interface and a second interface, the first interface is grounded, the second interface is connected to the input positive end of the first operational amplifier U3 after passing through the fifth resistor R5, and then the PH sensor signal PH _ ADC is formed after being filtered by a filter circuit consisting of the third resistor R3 and the first capacitor C1 after being output by a first operational amplifier U3 circuit, and the PH sensor signal PH _ ADC is connected with a third pin AD _ IN6 of the system control circuit.
6. The digital PH electrode of claim 4, 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 a 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 sixth resistor R6 IN series and then is connected with a temperature signal acquisition circuit power supply VCC3V3, voltage generated by voltage division and related to a measured temperature resistor is connected to an input positive terminal 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 system control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021121159.6U CN212229455U (en) | 2020-06-17 | 2020-06-17 | Digital PH electrode |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021121159.6U CN212229455U (en) | 2020-06-17 | 2020-06-17 | Digital PH electrode |
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| CN212229455U true CN212229455U (en) | 2020-12-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114460152A (en) * | 2020-12-28 | 2022-05-10 | 海南聚能科技创新研究院有限公司 | ORP/pH signal acquisition transmitter and digital sensor |
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- 2020-06-17 CN CN202021121159.6U patent/CN212229455U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114460152A (en) * | 2020-12-28 | 2022-05-10 | 海南聚能科技创新研究院有限公司 | ORP/pH signal acquisition transmitter and digital sensor |
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