CN207703299U - A kind of non-contact capacitance induction multistage liquid level sensor - Google Patents
A kind of non-contact capacitance induction multistage liquid level sensor Download PDFInfo
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- CN207703299U CN207703299U CN201721294867.8U CN201721294867U CN207703299U CN 207703299 U CN207703299 U CN 207703299U CN 201721294867 U CN201721294867 U CN 201721294867U CN 207703299 U CN207703299 U CN 207703299U
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Abstract
A kind of non-contact capacitance induction multistage liquid level sensor, including tablet, PCB circuit board, capture button and water level indicator light；The tablet is integrated in the back side of the PCB circuit board；The capture button and water level indicator light are respectively arranged at the front of the PCB circuit board；Detection circuit in the PCB circuit board includes MCU detection circuits, liquid level sensor circuit, signal storage circuit and output control circuit；The MCU detection circuits are electrically connected with the tablet and capture button respectively.The utility model overcomes the shortcomings of that oneself has liquid level sensor acid-base value content is higher, service life is not grown in the stronger liquid of corrosivity, also easily water in unlike material, wall thickness container or other liquid or other particles can be detected simultaneously, even if the utility model in the presence of a harsh environment also can long-term effective use, and the accuracy, stability and reliability of detection circuit working condition are substantially increased, and install simple and convenient.
Description
Technical field
The utility model is related to sensor field more particularly to a kind of non-contact capacitance induction multistage liquid level sensors.
Background technology
Traditional capacitance level transducer has that electrode is exposed in water, and water changes interelectrode capacitance as medium, from
And the variation of sensed water level；Traditional water resistance type liquid level sensor, there is multiple electrodes, but when water did not had electrode, electrode it
Between there is faint electric current to flow through, thus sensed water level change；If above two sensor be applied to temperature is higher, water quality compared with
In the water of difference, it is easier to which fouling covers electrode and detection is caused to be failed.The liquid level sensor of magnetic float and tongue tube type also can
It is stuck because tying full water dirt on float, lead to level sensing failure.
The detection of capacitive sensing mode usually has two kinds of modes：
First way is to measure capacitance on induction metallic plate using electrically charged transfer inductance capacitance formula input terminal MCU
Variable quantity, judge whether to sense with the presence of liquid by MCU.
The second way is to form the high-frequency pulse signal that oscillator generates tens to hundreds of kHz by electronic circuit,
By the capacitance variations between tablet and liquid, water has been detected whether with the potential change of reference edge by comparator input terminal
Or other liquid.And export corresponding signal.But the oscillator due to being made of comparator and capacitance with extraneous factor change compared with
Greatly, the frequency of oscillation of circuit can also change therewith, larger to the baseline impact regulated, easily cause to drift about and change, make
Accuracy of detection, which reduces very to cause to generate, judges failure.
Utility model content
The purpose of this utility model is that proposing a kind of non-contact capacitance induction multistage liquid level sensor, oneself is overcome to have liquid
Level sensor, while can also be easily in the deficiency that acid-base value content is higher, service life is not grown in the stronger liquid of corrosivity
Water in unlike material, wall thickness container or other liquid or other particles are detected, even if the utility model is in adverse circumstances
Under also can long-term effective use, and substantially increase the accuracy, stability and reliability of detection circuit working condition, and install
It is simple and convenient.
For this purpose, the utility model uses following technical scheme：
A kind of non-contact capacitance induction multistage liquid level sensor, including tablet, PCB circuit board, capture button and water
Position indicator light；
The tablet is integrated in the back side of the PCB circuit board；
The capture button and water level indicator light are respectively arranged at the front of the PCB circuit board；
Detection circuit in the PCB circuit board include MCU detection circuits, liquid level sensor circuit, signal storage circuit and
Output control circuit；
The MCU detection circuits are electrically connected with the tablet and capture button respectively.
Further, the MCU detection circuits include microcontroller U1, model SN8P25233SOP14；
The signal storage circuit includes storage chip U2 and capacitance C3, the model AT24C02 of the storage chip U2；
The output control circuit 24 include resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, LED1,
LED2, LED3, LED4, LED5, LED6 and LED7；
Further include capacitance C1, capacitance C2, resistance R1 and button K1；
The both ends of the capacitance C1 are electrically connected in power end and ground terminal；
The both ends of the capacitance C2 are electrically connected in power end and ground terminal；
One end of the resistance R1 is electrically connected with power end, and the other end is electrically connected with the 5th pin of the microcontroller U1；
One end of the button K1 is connect with ground terminal, and the other end is electrically connected with the 5th pin of the microcontroller U1；
The liquid level sensor circuit is electrically connected with the 3rd pin of the microcontroller U1.
Further, the 1st pin, the 2nd pin, the 3rd pin and the 4th pin of the storage chip U2 is electrically connected with ground terminal
It connects；
One end of the capacitance C3 is electrically connected with ground terminal, and the other end is electrically connected with power end；
The 5th pin of the storage chip U2 is electrically connected with the ends SDA；
The 6th pin of the storage chip U2 is electrically connected with the ends SCL；
The 7th pin of the storage chip U2 is connect with ground terminal；
The 8th pin of the storage chip U2 is electrically connected with power end；
One end of the resistance R2 is electrically connected with the 1st pin of the microcontroller U1, the other end and the one of the LED1
End electrical connection；
One end of the resistance R3 is electrically connected with the 14th pin of the microcontroller U1, the other end and the one of the LED2
End electrical connection；
One end of the resistance R4 is electrically connected with the 6th pin of the microcontroller U1, the other end and the one of the LED3
End electrical connection；
One end of the resistance R5 is electrically connected with the 7th pin of the microcontroller U1, the other end and the one of the LED4
End electrical connection；
One end of the resistance R6 is electrically connected with the 8th pin of the microcontroller U1, the other end and the one of the LED5
End electrical connection；
One end of the resistance R7 is electrically connected with the 9th pin of the microcontroller U1, the other end and the one of the LED6
End electrical connection；
The other end of described LED1, LED2, LED3, LED4, LED5 and LED6 are electrically connected with ground terminal.
Further, the tablet is rectangle copper foil.
Further, the signal storage circuit is erasable memory.
Further, further include zero datum reference value setting button, be set to the PCB circuit board.
The utility model proposes a kind of non-contact capacitance induction multistage liquid level sensor according to the above, oneself is overcome to have
Liquid level sensor can also facilitate in the deficiency that acid-base value content is higher, service life is not grown in the stronger liquid of corrosivity
Ground is detected water in unlike material, wall thickness container or other liquid or other particles, even if the utility model is in severe ring
Under border also can long-term effective use, and substantially increase the accuracy, stability and reliability of detection circuit working condition, and pacify
It fills simple and convenient.
Description of the drawings
Fig. 1 is the structural schematic diagram of the one of embodiment of the utility model；
Fig. 2 is that the non-contact capacitance induction multistage liquid level sensor of the one of embodiment of the utility model uses signal
Figure；
Fig. 3 is the light on and off compares figure of LED3, LED4, LED5 and LED6 of the utility model；
Fig. 4 is the circuit diagram of the one of embodiment of the utility model.
Wherein：Tablet 1, PCB circuit board 2, capture button 3, water level indicator light 4, MCU detection circuits 21, liquid level induction
Circuit 22, signal storage circuit 23, output control circuit 24, container 5, liquid level 6.
Specific implementation mode
Further illustrate the technical solution of the utility model below with reference to the accompanying drawings and specific embodiments.
As shown in Figures 1 to 4, a kind of non-contact capacitance induction multistage liquid level sensor, including tablet 1, PCB circuits
Plate 2, capture button 3 and water level indicator light 4；
The tablet 1 is integrated in the back side of the PCB circuit board 2；
The capture button 3 and water level indicator light 4 are respectively arranged at the front of the PCB circuit board 2；
Detection circuit in the PCB circuit board 2 includes MCU detection circuits 21, liquid level sensor circuit 22, signal storage electricity
Road 23 and output control circuit 24；
The MCU detection circuits 21 are electrically connected with the tablet 1 and capture button 3 respectively.
In use, a kind of non-contact capacitance induction multistage liquid level sensor is mounted on the outer wall of container 5, it is powered
Afterwards, form capacitance between the liquid level 6 in the liquid level sensor circuit 22 and the container 5, by this value be sent into microcontroller U1 into
Row calculates, and the value that microcontroller U1 is read in the eeprom memory in signal storage circuit 23 is compared, to determine multistage liquid
A certain section in position, the corresponding section of liquid level is indicated by the water level indicator light 4.The utility model uses microcontroller U1
Simultaneously control output end, the circuit anti-interference ability are very strong for judgement signal magnitude after acquiring signal.
Further, the MCU detection circuits 21 include microcontroller U1, model SN8P25233SOP14；
The signal storage circuit 23 includes storage chip U2 and capacitance C3, the model of the storage chip U2
AT24C02；
The output control circuit 24 include resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, LED1,
LED2, LED3, LED4, LED5, LED6 and LED7；
Further include capacitance C1, capacitance C2, resistance R1 and button K1；
The both ends of the capacitance C1 are electrically connected in power end and ground terminal；
The both ends of the capacitance C2 are electrically connected in power end and ground terminal；
One end of the resistance R1 is electrically connected with power end, and the other end is electrically connected with the 5th pin of the microcontroller U1；
One end of the button K1 is connect with ground terminal, and the other end is electrically connected with the 5th pin of the microcontroller U1；
The liquid level sensor circuit 22 is electrically connected with the 3rd pin of the microcontroller U1.
Further, the 1st pin, the 2nd pin, the 3rd pin and the 4th pin of the storage chip U2 is electrically connected with ground terminal
It connects；
One end of the capacitance C3 is electrically connected with ground terminal, and the other end is electrically connected with power end；
The 5th pin of the storage chip U2 is electrically connected with the ends SDA；
The 6th pin of the storage chip U2 is electrically connected with the ends SCL；
The 7th pin of the storage chip U2 is connect with ground terminal；
The 8th pin of the storage chip U2 is electrically connected with power end；
One end of the resistance R2 is electrically connected with the 1st pin of the microcontroller U1, the other end and the one of the LED1
End electrical connection；
One end of the resistance R3 is electrically connected with the 14th pin of the microcontroller U1, the other end and the one of the LED2
End electrical connection；
One end of the resistance R4 is electrically connected with the 6th pin of the microcontroller U1, the other end and the one of the LED3
End electrical connection；
One end of the resistance R5 is electrically connected with the 7th pin of the microcontroller U1, the other end and the one of the LED4
End electrical connection；
One end of the resistance R6 is electrically connected with the 8th pin of the microcontroller U1, the other end and the one of the LED5
End electrical connection；
One end of the resistance R7 is electrically connected with the 9th pin of the microcontroller U1, the other end and the one of the LED6
End electrical connection；
The other end of described LED1, LED2, LED3, LED4, LED5 and LED6 are electrically connected with ground terminal.
When road interface is electrified, power end VCC supplies the monolithic after the capacitance C1 and the C2 are filtered
Machine U1 is in standby as power supply and reference voltage, at this time the microcontroller U1；
When there is liquid close to liquid level sensor circuit 22, i.e., when there is liquid in the range of the tablet 1, press
5th foot of K1 buttons, the microcontroller U1 detects level change, the faint electricity sensed at once to the 3rd foot of microcontroller U1
Ordinary mail number is acquired analysis, and stores the result into storage chip U2, and this completes the zero of current liquid height
The setting of point reference value；When each liquid rises to again or is more than the reference position, the tablet 1 will sense
Signal be transmitted to the microcontroller U1, the microcontroller U1 judges the size of the value, then passes through the resistance R2, the electricity
Resistance R3, the resistance R4, the resistance R5, the resistance R6 and the resistance R7 output low and high level controls LED1,
The light on and off of LED2, LED3, LED4, LED5 and LED6 determine the height of liquid level with this.
The control circuit 24 detects that, less than zero datum reference value, LED1 lamps are bright；When higher than zero datum reference value,
LED2 lamps are bright.After LED2 is bright, the corresponding water level of LED3, LED4, LED5, LED6 light on and off is as shown in Figure 3.
Further, the tablet 1 is rectangle copper foil, is used to detect multistage liquid level, convenient and efficient.
Further, the signal storage circuit 23 is erasable memory, for storing collected induction zero electricity
Hold signal value, there is power failure memory function.The memory is communicated by IC with microcontroller U1 after the power is turned on every time, and by a reference value
It is uploaded to microcontroller U1, the value that microcontroller U1 is detected according to a reference value and induction relatively determines the section residing for current level
Position.
Further, further include zero datum reference value setting button, be set to the PCB circuit board 2.
The microcontroller U1 uses Integrated circuit IC, and wherein integrated functionality includes：Cathode input channel, vibrational control list
Member, cycle of oscillation counter, programmable internal reference voltage.
The cathode input channel incudes the pin of copper foil for MCU connections, for inputting detection signal；
Oscillation control unit executes relaxation oscillations action, for the water level of different sections, that is, is different capacitance, corresponding
Different frequencies；
Programmable internal reference voltage, the bound of charging is arranged by comparing the positive input terminal of device, rations the power supply from down
Pressure is charged to upper limit voltage, and then electric discharge comes back to lower voltage limit, forms the period of oscillator.Measuring principle is measured by setting
Time used in fixed number of cycles.
The technical principle of the utility model is described above in association with specific embodiment.These descriptions are intended merely to explain this reality
With novel principle, and it cannot be construed to the limitation to scope of protection of the utility model in any way.Based on the explanation herein,
Those skilled in the art would not require any inventive effort the other specific implementation modes that can associate the utility model,
These modes are fallen within the scope of protection of the utility model.
Claims (6)
1. a kind of non-contact capacitance induction multistage liquid level sensor, it is characterised in that：Including tablet, PCB circuit board, acquisition
Button and water level indicator light；
The tablet is integrated in the back side of the PCB circuit board；
The capture button and water level indicator light are respectively arranged at the front of the PCB circuit board；
Detection circuit in the PCB circuit board includes MCU detection circuits, liquid level sensor circuit, signal storage circuit and output
Control circuit；
The MCU detection circuits are electrically connected with the tablet and capture button respectively.
2. a kind of non-contact capacitance induction multistage liquid level sensor according to claim 1, it is characterised in that：
The MCU detection circuits include microcontroller U1, model SN8P25233SOP14；
The signal storage circuit includes storage chip U2 and capacitance C3, the model AT24C02 of the storage chip U2；
The output control circuit 24 include resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, LED1,
LED2, LED3, LED4, LED5, LED6 and LED7；
Further include capacitance C1, capacitance C2, resistance R1 and button K1；
The both ends of the capacitance C1 are electrically connected in power end and ground terminal；
The both ends of the capacitance C2 are electrically connected in power end and ground terminal；
One end of the resistance R1 is electrically connected with power end, and the other end is electrically connected with the 5th pin of the microcontroller U1；
One end of the button K1 is connect with ground terminal, and the other end is electrically connected with the 5th pin of the microcontroller U1；
The liquid level sensor circuit is electrically connected with the 3rd pin of the microcontroller U1.
3. a kind of non-contact capacitance induction multistage liquid level sensor according to claim 2, it is characterised in that：
The 1st pin, the 2nd pin, the 3rd pin and the 4th pin of the storage chip U2 is electrically connected with ground terminal；
One end of the capacitance C3 is electrically connected with ground terminal, and the other end is electrically connected with power end；
The 5th pin of the storage chip U2 is electrically connected with the ends SDA；
The 6th pin of the storage chip U2 is electrically connected with the ends SCL；
The 7th pin of the storage chip U2 is connect with ground terminal；
The 8th pin of the storage chip U2 is electrically connected with power end；
One end of the resistance R2 is electrically connected with the 1st pin of the microcontroller U1, one end electricity of the other end and the LED1
Connection；
One end of the resistance R3 is electrically connected with the 14th pin of the microcontroller U1, one end electricity of the other end and the LED2
Connection；
One end of the resistance R4 is electrically connected with the 6th pin of the microcontroller U1, one end electricity of the other end and the LED3
Connection；
One end of the resistance R5 is electrically connected with the 7th pin of the microcontroller U1, one end electricity of the other end and the LED4
Connection；
One end of the resistance R6 is electrically connected with the 8th pin of the microcontroller U1, one end electricity of the other end and the LED5
Connection；
One end of the resistance R7 is electrically connected with the 9th pin of the microcontroller U1, one end electricity of the other end and the LED6
Connection；
The other end of described LED1, LED2, LED3, LED4, LED5 and LED6 are electrically connected with ground terminal.
4. a kind of non-contact capacitance induction multistage liquid level sensor according to claim 1, it is characterised in that：The sense
It is rectangle copper foil to answer plate.
5. a kind of non-contact capacitance induction multistage liquid level sensor according to claim 1, it is characterised in that：The letter
Number storage circuit is erasable memory.
6. a kind of non-contact capacitance induction multistage liquid level sensor according to claim 1, it is characterised in that：Further include
Zero datum reference value sets button, is set to the PCB circuit board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721294867.8U CN207703299U (en) | 2017-10-10 | 2017-10-10 | A kind of non-contact capacitance induction multistage liquid level sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721294867.8U CN207703299U (en) | 2017-10-10 | 2017-10-10 | A kind of non-contact capacitance induction multistage liquid level sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207703299U true CN207703299U (en) | 2018-08-07 |
Family
ID=63021344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721294867.8U Active CN207703299U (en) | 2017-10-10 | 2017-10-10 | A kind of non-contact capacitance induction multistage liquid level sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207703299U (en) |
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2017
- 2017-10-10 CN CN201721294867.8U patent/CN207703299U/en active Active
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| GR01 | Patent grant | ||
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Effective date of registration: 20200624 Address after: 528500 Guangdong province Foshan Gaoming Cangjiang Industrial Park Road and Yang Town No. 372 Co-patentee after: Daren Intelligent Technology (Foshan) Co.,Ltd. Patentee after: CHUANDONG MAGNETIC ELECTRONIC Co.,Ltd. Address before: 528500 Guangdong province Foshan Gaoming Cangjiang Industrial Park Road and Yang Town No. 372 Patentee before: CHUANDONG MAGNETIC ELECTRONIC Co.,Ltd. |