CN210181129U - Capacitance measuring device - Google Patents
Capacitance measuring device Download PDFInfo
- Publication number
- CN210181129U CN210181129U CN201920776392.9U CN201920776392U CN210181129U CN 210181129 U CN210181129 U CN 210181129U CN 201920776392 U CN201920776392 U CN 201920776392U CN 210181129 U CN210181129 U CN 210181129U
- Authority
- CN
- China
- Prior art keywords
- resistor
- pins
- singlechip
- minimum system
- chip
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The utility model discloses an electric capacity measuring device. The method comprises the following steps: the device comprises a power supply terminal (1), a first resistor (2), a second resistor (3), a capacitor to be tested (4), a ne555 chip (5), a singlechip minimum system (6) and a liquid crystal display (7). When the device is used, a capacitor (4) to be tested is inserted from the two-hole pin header, the capacitance value Cx of the capacitor (4) to be tested is ln2/((R1+2R2) × f), the resistance value R1 of the first resistor (2) and the resistance value R2 of the second resistor (3) can be stored in the singlechip minimum system (6) in advance, the singlechip minimum system (6) measures the frequency f value of an input signal, and the Cx value is calculated through Cx being 0.7/((R1+2R2) × f) and then is sent to the liquid crystal display (7) for display.
Description
Technical Field
The utility model belongs to the physical measurement field relates to an electric capacity measuring device.
Background
A single-chip microcomputer, which is a typical embedded microcontroller (MicrocontrollerUnit) for short, is usually indicated by an english alphabet, namely MCU, and is used in the industrial control field for the first time. At present, the single chip microcomputer permeates into various fields of our life, and the trace of the single chip microcomputer in which field is not available is hardly found. The single chip microcomputer is operated by a program and can be modified. The technical personnel in the field can realize different functions through different programs without creative labor, and through the programs, the single chip microcomputer can conveniently control the lighting of the LED lamp and the nixie tube and the rotating speed of the motor, and various random numbers can be conveniently generated and operated. The high intelligence, the high efficiency and the high reliability of the product can be realized through the program. At present, the program of the liquid crystal display LCD1602 controlled by the single chip microcomputer is mature and is generally applied in various fields.
Disclosure of Invention
An object of the utility model is to design a simple structure, convenient to use, dependable performance, low in cost's capacitance measuring device, can be used to the measurement of electric capacity.
In order to achieve the above object, the utility model discloses a power supply terminal (1), first resistance (2), second resistance (3), electric capacity (4) that await measuring, ne555 chip (5), singlechip minimum system (6), LCD (7), characterized by: the power supply terminal (1), the first resistor (2), the second resistor (3), the ne555 chip (5), the singlechip minimum system (6) and the liquid crystal display (7) are all welded on a circuit board, a two-hole pin header is welded on the circuit board, a capacitor (4) to be tested can be plugged in and pulled out of the pin header, and the power supply terminal (1) provides electric energy;
the singlechip minimum system (6) comprises a singlechip, a P0 port pull-up resistor, a clock circuit and a reset circuit, wherein the singlechip of the singlechip minimum system (6) is provided with 40 pins;
the power supply terminal (1) outputs a 5-volt direct-current power supply, the anode of the power supply terminal is connected with 40 pins of a singlechip in the minimum system (6) of the singlechip, and the cathode of the power supply terminal is connected with 20 pins of the singlechip in the minimum system (6) of the singlechip;
the ne555 chip (5) is provided with 8 pins, 4 pins and 8 pins of the ne555 chip (5) are connected together and then connected with the anode of the power terminal (1), the 1 pin is connected with the cathode of the power terminal (1), the 5 pin is connected with the cathode of the power terminal (1) after being connected with a capacitor in series, the upper end of the first resistor (2) is connected with the anode of the power terminal (1), the lower end of the first resistor (2) is connected with the upper end of the second resistor (3), the lower end of the second resistor (3) is connected with one hole row pin seat of the two hole row pin seats, the other hole row pin seat of the two hole row pin seats is connected with the cathode of the power terminal (1), 7 pins of the ne555 chip (5) are connected with the lower end of the first resistor (2), 2 pins and 6 pins of the ne555 chip (5) are connected together and connected with the lower end of the second resistor (3), and 3 pin output signals of the ne555 chip (5) are sent to 14 pins of a single chip microcomputer in the minimum system;
the model of the liquid crystal display (7) is LCD1602, the LCD1602 of the liquid crystal display (7) has 16 pins, and the pins from 4 to 14 are respectively connected with the pins 6, 7, 8, 39, 38, 37, 36, 35, 34, 33 and 32 of a singlechip in the minimum system (6) of the singlechip.
The utility model discloses LCD1602 of singlechip minimum system (6), LCD (7) is the market purchase product.
When the multi-hole pin header is used, a capacitor (4) to be tested is inserted from the two-hole pin header, the capacitance value of the capacitor is set to be Cx, the resistance value of the first resistor (2) is set to be R1, the resistance value of the second resistor (3) is set to be R2, the frequency of an output signal of a multivibrator formed by the ne555 chip (5) is set to be f-ln 2/((R1+2R2) × Cx), therefore, the capacitance value Cx of the capacitor (4) to be tested is set to be ln2/((R1+2R2) × f), the resistance value R1 of the first resistor (2) and the resistance value R2 of the second resistor (3) can be stored in the singlechip minimum system (6) in advance, the singlechip minimum system (6) measures the frequency f value of an input signal, and the Cx value is calculated through Cx ═ 0.7/((R1+2R2) × f) and then sent to a liquid crystal display (.
The utility model discloses an useful part is: the capacitance value can be conveniently measured.
Drawings
FIG. 1 is a circuit diagram of a capacitance measuring device signal output circuit;
FIG. 2 is a circuit diagram of a single chip microcomputer of the capacitance measuring device;
FIG. 3 is a circuit diagram of a capacitance measuring device display;
Detailed Description
The following describes the embodiments of the present invention with reference to the drawings.
Referring to fig. 1, the signal output circuit diagram of the capacitance measuring device includes a power supply terminal (1), a first resistor (2), a second resistor (3), a capacitor to be measured (4), a ne555 chip (5), a minimum system of a single chip (6), and a liquid crystal display (7), and is characterized in that: the power supply terminal (1), the first resistor (2), the second resistor (3), the ne555 chip (5), the singlechip minimum system (6) and the liquid crystal display (7) are all welded on a circuit board, a two-hole pin header is welded on the circuit board, a capacitor (4) to be tested can be plugged in and pulled out of the pin header, and the power supply terminal (1) provides electric energy;
the power supply terminal (1) outputs a 5-volt direct-current power supply, the anode of the power supply terminal is connected with 40 pins of a singlechip in the minimum system (6) of the singlechip, and the cathode of the power supply terminal is connected with 20 pins of the singlechip in the minimum system (6) of the singlechip;
the ne555 chip (5) is provided with 8 pins, 4 pins and 8 pins of the ne555 chip (5) are connected together and then connected with the anode of the power terminal (1), the 1 pin is connected with the cathode of the power terminal (1), the 5 pin is connected with the cathode of the power terminal (1) after being connected with a capacitor in series, the upper end of the first resistor (2) is connected with the anode of the power terminal (1), the lower end of the first resistor (2) is connected with the upper end of the second resistor (3), the lower end of the second resistor (3) is connected with one hole pin row of the two hole pin row seats, the other hole pin row of the two hole pin row seats is connected with the cathode of the power terminal (1), the 7 pin of the ne555 chip (5) is connected with the lower end of the first resistor (2), the 2 pin and 6 pin of the ne555 chip (5) are connected together and then connected with the lower end of the second resistor (3), and the 3 pin output signal of the ne555 chip (5) is sent to 14 pins of the single chip microcomputer in the minimum;
referring to a circuit diagram of a single chip microcomputer of the capacitance measuring device in fig. 2, the single chip microcomputer minimum system (6) comprises the single chip microcomputer, a P0 port pull-up resistor, a clock circuit and a reset circuit, and the single chip microcomputer of the single chip microcomputer minimum system (6) is provided with 40 pins;
referring to the circuit diagram of the display of the capacitance measuring device in fig. 3, the LCD (7) is in the type of LCD1602, the LCD1602 of the LCD (7) has 16 pins, and the pins 4 to 14 of the LCD are respectively connected with the pins 6, 7, 8, 39, 38, 37, 36, 35, 34, 33 and 32 of the single chip in the minimum system (6) of the single chip.
The utility model discloses LCD1602 of singlechip minimum system (6), LCD (7) is the market purchase product.
When the multi-hole pin header is used, a capacitor (4) to be tested is inserted from the two-hole pin header, the capacitance value of the capacitor is set to be Cx, the resistance value of the first resistor (2) is set to be R1, the resistance value of the second resistor (3) is set to be R2, the frequency of an output signal of a multivibrator formed by the ne555 chip (5) is set to be f ═ lr2/((R1+2R2) × Cx), therefore, the capacitance value Cx ═ ln2/((R1+2R2) × f) of the capacitor (4) to be tested can be stored in the singlechip minimum system (6) in advance, the frequency f value of an input signal is measured by the singlechip minimum system (6), and the Cx value is calculated by Cx ═ 0.7/((R1+2R2) /) and then is sent to a liquid crystal display (7) to be displayed.
The utility model discloses measurement capacitance value that can be convenient.
Claims (1)
1. Capacitance measuring device, its characterized in that: the capacitance measuring device consists of a power supply terminal (1), a first resistor (2), a second resistor (3), a capacitor (4) to be measured, a ne555 chip (5), a singlechip minimum system (6) and a liquid crystal display (7), wherein the power supply terminal (1), the first resistor (2), the second resistor (3), the ne555 chip (5), the singlechip minimum system (6) and the liquid crystal display (7) are all welded on a circuit board, a two-hole pin header is welded on the circuit board, the capacitor (4) to be measured can be inserted and pulled out from the pin header, and the power supply terminal (1) provides electric energy;
the singlechip minimum system (6) comprises a singlechip, a P0 port pull-up resistor, a clock circuit and a reset circuit, wherein the singlechip of the singlechip minimum system (6) is provided with 40 pins;
the power supply terminal (1) outputs a 5-volt direct-current power supply, the anode of the power supply terminal is connected with 40 pins of a singlechip in the minimum system (6) of the singlechip, and the cathode of the power supply terminal is connected with 20 pins of the singlechip in the minimum system (6) of the singlechip;
the ne555 chip (5) is provided with 8 pins, 4 pins and 8 pins of the ne555 chip (5) are connected together and then connected with the anode of the power terminal (1), the 1 pin is connected with the cathode of the power terminal (1), the 5 pin is connected with the cathode of the power terminal (1) after being connected with a capacitor in series, the upper end of the first resistor (2) is connected with the anode of the power terminal (1), the lower end of the first resistor (2) is connected with the upper end of the second resistor (3), the lower end of the second resistor (3) is connected with one hole row pin seat of the two hole row pin seats, the other hole row pin seat of the two hole row pin seats is connected with the cathode of the power terminal (1), 7 pins of the ne555 chip (5) are connected with the lower end of the first resistor (2), 2 pins and 6 pins of the ne555 chip (5) are connected together and connected with the lower end of the second resistor (3), and 3 pin output signals of the ne555 chip (5) are sent to 14 pins of a single chip microcomputer in the minimum system;
the model of the liquid crystal display (7) is LCD1602, the LCD1602 of the liquid crystal display (7) has 16 pins, and the pins from 4 to 14 are respectively connected with the pins 6, 7, 8, 39, 38, 37, 36, 35, 34, 33 and 32 of a singlechip in the minimum system (6) of the singlechip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920776392.9U CN210181129U (en) | 2019-05-22 | 2019-05-22 | Capacitance measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920776392.9U CN210181129U (en) | 2019-05-22 | 2019-05-22 | Capacitance measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210181129U true CN210181129U (en) | 2020-03-24 |
Family
ID=69834915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920776392.9U Expired - Fee Related CN210181129U (en) | 2019-05-22 | 2019-05-22 | Capacitance measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210181129U (en) |
-
2019
- 2019-05-22 CN CN201920776392.9U patent/CN210181129U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201210243Y (en) | Socket | |
| CN103426271B (en) | Electrical fire monitor unit with pulse metering and implementation method thereof | |
| CN109002375A (en) | A kind of electrifying timing sequence signal monitoring system and method applied to server | |
| CN210181129U (en) | Capacitance measuring device | |
| CN201210177Y (en) | Special module for electric energy metering | |
| CN203615993U (en) | Automatic detection device for intelligent water meter | |
| CN211180080U (en) | NPN type transistor current amplification factor measuring device | |
| CN210090567U (en) | Capacitance measuring device | |
| CN207281197U (en) | A kind of winding displacement tester | |
| CN203465806U (en) | Electrical fire disaster monitor having function of pulse metering | |
| CN201464588U (en) | Polarity measurement circuit of electrolytic capacitor | |
| CN203376469U (en) | Collecting and counting device for metering pulses of electric energy meter | |
| CN109144827A (en) | A kind of method and system monitoring motherboard power supply and signal condition | |
| CN206773140U (en) | A kind of manual testing's control device for semiconductor test system | |
| CN207283817U (en) | A kind of speaker digital indicator | |
| CN201266209Y (en) | Electric energy meter | |
| CN207232950U (en) | Time-sharing multiplex is connected in series circuit | |
| CN203644896U (en) | Lithium battery awakening instrument | |
| CN205210139U (en) | Row is inserted in multi -functional single -phase measurement | |
| CN213714492U (en) | Intelligent water meter duty ratio multichannel test tool | |
| CN203259808U (en) | Circuit breaker characteristic detection test bed automatic-carry timer | |
| CN214503867U (en) | Polarity tester with high stability | |
| CN103675700A (en) | Electric quantity prompting device for power supply of instrument | |
| CN201212902Y (en) | Wire inspection instrument | |
| CN202568215U (en) | Medical electronic thermometer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200324 Termination date: 20210522 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |