CN207557152U - A kind of novel pH value intelligent measure circuit - Google Patents
A kind of novel pH value intelligent measure circuit Download PDFInfo
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- CN207557152U CN207557152U CN201720745545.4U CN201720745545U CN207557152U CN 207557152 U CN207557152 U CN 207557152U CN 201720745545 U CN201720745545 U CN 201720745545U CN 207557152 U CN207557152 U CN 207557152U
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Abstract
The utility model devises a kind of novel Portable PH value intelligent measure circuit, includes minimum system, measuring electrode, display module and the wireless module of controller composition.Controller is using HC16L series monolithics；Part is measured using PH sensor, including temperature compensating electrode；That display and wireless transport module are respectively adopted is PCD8544 and ESP8266.The intelligent measuring instrument can detect and show the pH value of fluid to be measured, and data can be wirelessly transferred.This intelligent measuring instrument reliability is high, and strong antijamming capability is low in energy consumption.
Description
Technical field
The utility model design belongs to the measuring circuit that a kind of novel pH value applied to solution detects, mainly a kind of
In high precision, low-power consumption, efficient PH detection circuits.
Background technology
Each substance all has different pH values, and pH value having a great impact to substance in itself, therefore PH
Can research has our life and scientific research and has very important significance, and accurately the pH value of measurement of species just seem and more attach most importance to
It will.And with the continuous development of science and technology, traditional PH is measured cannot meet the needs of research in every field.Existing
In real application, we are even more that urgent need obtains pH value in real time.Such as in the clinical monitoring of hospital, the chemical process of factory
The fields such as control, the monitoring of human work and living environment and protection and those be difficult to the hazardous area sampled, chemical information
Acquisition be also it is very intractable.Therefore, apply and carry out new pH detecting instruments for having the research of pH detecting instruments
Exploitation, using being highly important.The pH value detection circuit of the design has selected under conditions of precision is enough price more
Cheap main control chip, display screen and IC devices so as to be effectively controlled cost, is also achieved to pH value more accurately, faster
Prompt and more detection in real time, has critically important realistic meaning.
Invention content
The purpose of this utility model is that improving the deficiency of the prior art and cost, design one kind can be suitble to actual production
Applied to the pH value detection circuit of portable apparatus, the flexibility of detection and the accuracy of detection are improved, is with high-performance, height
The pH value detection circuit of reliability.
The design system is broadly divided into two parts：First part is formed most for HC16LC16K6TALQFP64 MCU chips
Mini system completes the function of system control and data processing by the connection of I/O interfaces and peripheral circuit.Second part is
The analog circuit (pH value amplifying circuit and temperature-compensation circuit) of periphery, by the voltage values of IC chip processing of circuit PH electrodes simultaneously
Amplification is transferred to the measurement and display that main control chip completes data.
The control of the design and display system advantage
The selection of processor：There is no the MCU for selecting foreign brand name in the selection of processor, but selected price more just
Preferably, the HC16LC16K6TALQFP64MCU of the better homemade chip HC16L series of performance, FP64 chips employ the 16 of 80251
Bit CPU platform, 40 times faster than the 80C51 processing capacities of standard type, and with the up to cpu clock of 16MHZ, there are three types of tools
Low-power consumption mode, electric current is minimum, and up to 0.9 microampere, sleep pattern is 40 microamperes, and operating mode is 260 microamperes；And from low work(
Mode wakeup is consumed to operating mode, and the response time is no more than 3 microseconds, is the half of MSP430 series, has sound quickly
Answer speed；Its operating temperature is -40~85 DEG C, adapts to severe operative scenario, and single supply power supply (is suitble to for 1.8~3.8V
Portable device), it is comprehensive for be the MCU with high degree of integration, high noise immunity, high reliability and super low-power consumption.Reaching
The cost for making instrument in the case of it is required that is lower.
The raising of precision and safety：With 64 hardware DES encryption-decryption coprocessors and 16 hardware CRC check circuit moulds
Block, unique 8 byte ID number have very high reliability, safety.
Faster wakeup time：Each MCU that can be used for portable instrument, all with power consumption management system,
HC16LC16K6TALQFP64MCU tools are there are three types of low-power consumption mode, a kind of sleep pattern and a kind of operating mode, from low-power consumption
For mode wakeup to operating mode, the response time is no more than 3us, makes switch speed faster, and energy consumption is lower.
The selection of display chip：Display screen LCD screen is instead of LED screen, lower, also more power saving in price, the design
It has selected once with the PCD8544LCD screens on 5110 mobile phone of Nokia, can show four row words, fully meet instrument requirements, and
And module volume very little, using low voltage power supply, and with power-down mode, more power saving.
The selection of the LCD screen of display：The LCD display model PCD8544 of selection is a once used in Nokia 5110
A LCD screen on mobile phone.Select the reason is as follows that：
It is cost-effective.PCD8544 can show 15 Chinese characters, 30 characters, and price is than 12864 and 1602 grade other LCD
Screen at least wants cheap half, even more.
Interface is simple.Only four I/O lines can drive.
Speed is fast.It is 20 times of LCD12864,40 times of LCD1602.
PCD8544 operating voltages are 3.3V, and 200 microamperes of operating current is very suitable for battery confession hereinafter, with power-down mode
The portable mobile apparatus of electricity.
The improvement of the PH detection circuits of the design and advantage
Original pre-amplification circuit has been selected double operational operational amplifier LM4562, biggest advantage by PH detection circuits
It is exactly big at low cost, precision, low noise and low input bias current.LM4562 is the IC of high-fidelity double operational, and distortion is super
Small, only 0.00003% total harmonic distortion and noise (THD+N), in other words, the distortion of LM4562 operational amplifiers is several
It can be ignored.And LM4562 chips also have extremely low distortion rate, low noise, high conversion rate, very wide work electricity
The advantages that pressing range and larger output current, the height of performance is unprecedented.Therefore, it is suitble to answering for portable detection device
With.
The design employs 18b20 as solution temperature sensor, and 18b20 is a common temperature sensor, is had
It is small, it is cheap, the features such as strong antijamming capability, precision is high.And the data that 18b20 is measured can be transmitted directly to
FP64 MCU, hardware circuit design is simple, and error is small.The I/O mouths of FP64 MCU are transmitted directly to after the measurement data of 18b20
The transmission of data can be realized.
Description of the drawings
Fig. 1 forms schematic diagram for system
Fig. 2 links schematic diagram for minimum system with display screen and wireless module
Fig. 3 is pH value detection and temperature-compensation circuit schematic diagram
Specific embodiment
As shown in Figure 1, the whole system of the utility model PH detection circuits includes：PH sensor module is (for measuring spirulina
The PH electrodes value and its temperature value of culturing liquid)；PH sensor interface module (amplification for completing PH electrode values)；Temperature passes
Sensor interface module (is used for the measurement and reading of temperature value, to carry out temperature-compensating)；HC16LC16K6TALQFP64 master
The minimum systematic module (realizing the reading process of data and the function of output) that chip is formed is controlled, LCD display is (for showing
The temperature value of the pH value of measurement and current detected solution).
Minimum system and the connection of the circuit of display are as shown in Fig. 2, it is certainly that the DVSS pins of FP64 MCU, which meet VCC (3.3V),
Body is powered, and resistance R3 (4.7K) and C6 capacitances (0.1uF) connect the reset circuit that RSTB pins form minimum system, are used for
The reset operation of FP64 MCU, AVSS1 pins and AVSS2 pins are grounded, capacitance C4 (4.7uF) connections VDD_CORE
(LDO capacitive interfaces), C5 (0.1uF) and AVCC2 connect and compose analog power interface, DVCC digitally pin, AVSS1 and
AVSS2 simulations ground three pin ground connection of pin, capacitance C8 (12pF) and C9 (12pF) and X1 (32.768KHZ crystal oscillators) are formed
The external crystal-controlled oscillation of FP64 MCU, uses as external clock.
The circuit connection of FP64 MCU and PCD8544：The VDD pins of PCD8544 connect DVCC (the number electricity of FP64 MCU
Source) pin, it is powered for LCD, the SPICLK that the SCLK pins (serial clock input terminal) of PCD8544 meet FP64 MCU draws
Foot (SPI clocks from input, main output) is LCD input clock signals, and SDIN pins (serial data input pin) then connect
The SPIMOSI pins (output of SPI master datas is inputted from data) of FP64 MCU are LCD input datas,Pin (data/
Order) connect FP64 MCU SPIMISO pins (SPI master datas input, from data export) for LCD carry out model selection, selection
Command/address or input data,Pin andPin then accesses the common I/O (input and output pin) of LP64 MCU,
The GND pin of PCD8544 is directly grounded, and VOUT pins are then grounded after capacitance is connect.
The circuit connection of FP64 MCU and ESP8266：The VCC pin of ESP8266 connects VCC power supplys (3V3), CH_PD pins
It is effective that high level is connect for enabled pin, equally meets VCC.GND pins are grounded.The RST pins of ESP8266 are reset pin, as
External hardware, which resets, to be used, and is connect the common I/O interfaces of FP64 MCU, the reset of ESP8266 is controlled to operate with FP64 MCU.
The UTXD pins (serial ports transmission) of ESP8266 connect the RXD1 pins (serial ports reception) of FP64 MCU, the URXD (serial ports of ESP8266
Receiving) pin connects the TXD1 pins (serial ports transmission) of FP64 MCU, sending and receiving as data.
The connection of PH detection circuits：As shown in figure 3, the V+ pins of U1 meet VCC, V- pins ground connection is powered for it.R3
With latter section in parallel positive input port being connected with the cathode on ground and Zener diode D1 with the other end and resistance R2 and U1 of C1
It is connected, one end of R1 and the VCC other end that is connected are connected with the anode of Zener diode D1 and one end of R2, and bearing for U1 is defeated
The output port that inbound port is connected to LM4562 is connected with the negative electrode of PH electrodes.The same with U1, the V+ pins of U2 meet VCC, V-
Pin is grounded, and is powered for it.R4 one end is grounded, the negative input port of another termination U2；R5 mono- terminates the negative input end of U2
Mouthful, the output port of another termination U2；The anode of PH electrodes connects the positive input port of U2；The output port of U2 meets the P3.0 of MCU
Interface.18b20 temperature signals are directly connected on the P3.1 pins of MCU.
Claims (6)
1. a kind of novel pH value intelligent measure circuit, it is characterised in that：Including MCU circuits, peripheral analog circuit, temperature sensing
Device circuit, display circuit, ESP8266 wireless modules,
The MCU circuits are the functions of connecting to complete circuit control and data processing by I/O mouthfuls and peripheral circuit；
The periphery analog circuit is used to handle the voltage value of PH electrodes；
The temperature sensor is used to detect the temperature of testee；
The display circuit is used to show the pH value and temperature of object being measured；
The ESP8266 wireless modules are connected with MCU circuits.
2. a kind of novel pH value intelligent measure circuit according to claim 1, it is characterised in that：The MCU circuits packet
Include main control chip HC16LC16K6TALQFP64, capacitance C2, capacitance C3, capacitance C4, capacitance C5, capacitance C6, capacitance C7, capacitance
C8, resistance R7 and crystal oscillator X1.
3. a kind of novel pH value intelligent measure circuit according to claim 1, it is characterised in that：The PH sensor electricity
Road includes resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, capacitance C1, Zener diode D1, operational amplifier U1 and fortune
Amplifier U2 is calculated, the operational amplifier U1 positive input terminals are connected with resistance R2, resistance R3 with one end of capacitance C1, the fortune
The negative input end for calculating amplifier U1 is connected with output terminal, the other end of the resistance R3 and capacitance C1 and the one of Zener diode D1
End is connected and is grounded, and the resistance R2 is connected with the other end of Zener diode D1 with one end of resistance R1, the resistance R1's
Another termination VCC, the negative input end of the operational amplifier U2 are connected with one end of resistance R4, resistance R5, the resistance R5's
The other end is connected with output terminal, the other end ground connection of the resistance R4.
4. a kind of novel pH value intelligent measure circuit according to claim 1, it is characterised in that：The temperature sensor
Circuit includes 18B20 chips and resistance R6, the VCC pin of the 18B20 chips and termination a VCC, the 18B20 of resistance R6
The DQ pins of chip are connected with the other end of resistance R6, the GND pin ground connection of the 18B20 chips.
5. a kind of novel pH value intelligent measure circuit according to claim 1, it is characterised in that：The display circuit packet
PCD8544 chips and capacitance C7 are included, GND with the VOUT pins of the PCD8544 chips are connected with one end of capacitance C7, the electricity
Hold the other end ground connection of C7.
6. a kind of novel pH value intelligent measure circuit according to claim 1, it is characterised in that：The ESP8266 without
Wire module includes ESP8266 chips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720745545.4U CN207557152U (en) | 2017-06-21 | 2017-06-21 | A kind of novel pH value intelligent measure circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720745545.4U CN207557152U (en) | 2017-06-21 | 2017-06-21 | A kind of novel pH value intelligent measure circuit |
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| CN207557152U true CN207557152U (en) | 2018-06-29 |
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| CN201720745545.4U Expired - Fee Related CN207557152U (en) | 2017-06-21 | 2017-06-21 | A kind of novel pH value intelligent measure circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111965219A (en) * | 2020-08-10 | 2020-11-20 | 福建智恒优水科技有限公司 | Water sample pH value detector and method |
| CN112043449A (en) * | 2020-10-10 | 2020-12-08 | 桂林市啄木鸟医疗器械有限公司 | Dental therapeutic apparatus for detecting pH value |
| CN112631344A (en) * | 2020-12-28 | 2021-04-09 | 福建顺昌虹润精密仪器有限公司 | PH controller with strong adaptability |
-
2017
- 2017-06-21 CN CN201720745545.4U patent/CN207557152U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111965219A (en) * | 2020-08-10 | 2020-11-20 | 福建智恒优水科技有限公司 | Water sample pH value detector and method |
| CN112043449A (en) * | 2020-10-10 | 2020-12-08 | 桂林市啄木鸟医疗器械有限公司 | Dental therapeutic apparatus for detecting pH value |
| CN112631344A (en) * | 2020-12-28 | 2021-04-09 | 福建顺昌虹润精密仪器有限公司 | PH controller with strong adaptability |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180629 Termination date: 20190621 |