CN209559802U - A kind of portable salinometer based on STM8L052 single-chip microcontroller - Google Patents
A kind of portable salinometer based on STM8L052 single-chip microcontroller Download PDFInfo
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- CN209559802U CN209559802U CN201822230412.0U CN201822230412U CN209559802U CN 209559802 U CN209559802 U CN 209559802U CN 201822230412 U CN201822230412 U CN 201822230412U CN 209559802 U CN209559802 U CN 209559802U
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Abstract
The utility model discloses a kind of portable salinometer based on STM8L052 single-chip microcontroller, which includes one-chip computer module, power supply and on-off circuit module, temperature collecting module, conductivity detection module, Wi-Fi data transmission module, buzzer module and segment liquid crystal display module；The one-chip computer module uses STM8L052 single-chip microcontroller；The real-time voltage value of single-chip microcontroller combination ADC control conductivity detection module and the analog signal of temperature collecting module output is converted to salting liquid conductivity and temperature value, salt angle value is calculated according to salinity calculation formula, and is shown salt angle value and temperature value by segmentation LCD MODULE；Salt angle value and temperature Value Data are transferred to mobile phone or terminal by Wi-Fi data transmission module, carry out the reception, arrangement and preservation work of data.The utility model external form is small and exquisite easy to carry, easy to operate, and has the advantages that the readable high and data of data can be wirelessly transferred.
Description
Technical field
The utility model belongs to electronic measuring technology field more particularly to a kind of based on the portable of STM8L052 single-chip microcontroller
Salinometer.
Background technique
There are chemical method, optical method, hydrometer method, microwave remote sensing method, conductance method for seawater salinity method for measuring both at home and abroad,
Hydrometer method, optical method are all single-point type measurements, and microwave remote sensing technique precision is not high, are difficult to meet under food product environment and want in high precision
The work asked.In recent years, many companies both domestic and external have developed into series for the measurement situation of edible salt in daily life
Salinity measurement instrument, also referred to as food salinometer.The salt content of food is detected, the salt content ratio of food is controlled,
Everybody is encouraged to control the intake of salt, rational diet.Food salinometer can be popularized for huge numbers of families, as residential households kitchen
With the necessity in kitchen after catering industry.Therefore, simple, portable, practical food salinometer will become the daily life of the following people
Necessity in work.
Utility model content
Purpose of utility model: in view of the above problems, the utility model proposes a kind of based on the portable of STM8L052 single-chip microcontroller
Formula salinometer, the salt content for food detect.The utility model selects conductance method to carry out salinity measurement, realizes salinity meter systems
Accurately measure, more quickly, accurate and be suitable for in-site measurement；By segmentation liquid crystal display salt angle value and by wirelessly passing
The data of measurement are passed to mobile phone or terminal by defeated mode, realize the hommization and visualization of salinity meter systems.
Technical solution: to realize the purpose of this utility model, the technical scheme adopted by the utility model is one kind is based on
The portable salinometer of STM8L052 single-chip microcontroller, including one-chip computer module, power supply and on-off circuit module, temperature collecting module,
Conductivity detection module, Wi-Fi data transmission module, buzzer module and segment liquid crystal (LCD) display module.
One-chip computer module chip uses STM8L052, enable port power_en, the power supply of power supply and on-off circuit module
Supply port batt_ad, switch key port key_monitor are separately connected single-chip microcontroller PD5, PB4, PC0 pin and supply to system
Electricity, supply voltage 3.3V.PB0~PB2 pin of single-chip microcontroller is inputted by the low level that conducting wire connects conductivity measurement module
Port cont_low, supply voltage input port conductivity_ad and high level input port cont_hight, PB0 and
PB2 pin forms two electrodes and provides alternating voltage, the power supply of the conductivity measurement module for the conductivity measurement module
Voltage accesses PB1 pin after filtering by capacitor C3；The supply voltage input port of PB3 pin connection temperature collecting module
Temp_ad controls voltage acquisition and calculates temperature；PA4~PA6, PD1, PA7, PE0~PE5, PD0, PD2~PD3 pin pass through
Data unit display port lcd_com0~lcd_com2 of conducting wire and segment liquid crystal display module, lcd_com3, number are shown
Port lcd_seg0, lcd_seg1~lcd_seg6, lcd_seg7, lcd_seg8~lcd_seg9 connection；PC2~PC7 pin
By the data receiver RX of conducting wire and Wi-Fi data transmission module, data sending terminal TX, serial communication I/O port GPIO2 and
GPIO0, high level input port CH_PD are connected with reseting port RST, the transmission of PC3 and PC2 respectively as wirelessly transmitting data
End and receiving end；PC6 is Wi-Fi data transmission module power supply, and high level is effective；Buzzer module uses piezoelectric type buzzing
Device, the voltage input port BEEP of buzzer module are connected with the PA0 foot of single-chip microcontroller, and high level is effective.
The one-chip computer module uses 8-bit MCU, the STM8L052 single-chip microcontroller of STM8L super low-power consumption series, port
Quantity and LCD driving capability are sufficient for the utility model use demand, and inside possesses 12 ADC in 25 channels, acquire number
According to precision can be guaranteed, while STM8L052 single-chip microcontroller also meets the utility model and data processing speed is wanted
It asks, in addition, the price of STM8L052 single-chip microcontroller is more appropriate, hardware cost can be greatly reduced.
The power supply and on-off circuit module include power supply, DC/DC voltage up converting circuit and switching circuit.To realize
Portable function, using No. 5 batteries as system power supply power supply, the voltage of every batteries is 1.5V, what two batteries were provided in series
Voltage is 3V, drive system can be worked normally well, since the utility model is low-power dissipation system, battery capacity
Longer time is used enough.In addition, being wanted for a SCM system with more peripheral hardware to the stability of working power
It asks higher, single-chip microcontroller cannot be caused to reset because of low-voltage due to fluctuations in the power supply, due to the supplied character of battery, as battery holds
The voltage of the reduction of amount, battery can reduce, so needing voltage-stabilizing device to be protected and be gone to interfere to circuit, realize system
It operates normally.DC/DC voltage up converting circuit selects HX3001 chip, and such DC/DC boost converter chips have PWM control same
Function is walked, chip performance is well matched with the power supply of the utility model battery, can meet the primary demand of boosting and pressure stabilizing simultaneously,
And output power is also able to satisfy driving all peripheral hardwares of the utility model.Switching circuit include a positive-negative-positive metal-oxide-semiconductor AP2305N,
Two NPN type triodes 9013, the interrupt routine of switching circuit combination single-chip microcontroller, may be implemented operating function abundant.Switch
Circuit and DC/DC voltage up converting circuit collective effect realize that the power supply and switching on and shutting down to whole system control.
The temperature collecting module selects thermistor as temperature acquisition device, realizes water-proof function and required space is tied
Structure is smaller.Using 10K resistance as reference standard, thermistor both end voltage is acquired by the ADC of single-chip microcontroller, passes through collection voltages
Calculate the resistance value of thermistor, finally according to resistance value table temperature value, the range of value is 0~99 degree Celsius.
Two beckets being placed in parallel constitute required conductivity probe in the conductivity detection module, also cry
Test nipple, two beckets are equivalent to the metal plate in conductivity test philosophy, and two metal ring parts are not connected to one and lead
Line connects PB0 the and PB2 pin port of single-chip microcontroller STM8L052, provides voltage to becket by the two ports, forms electricity
Pole.Measurement can obtain the distance of becket area and electrode, when popping one's head in into the water, be equivalent between two beckets and concatenated one
A resistance measures the voltage value of becket one end using the principle of resistance series connection partial pressure, and calculates the resistance formed by conductance
Value.
The Wi-Fi data transmission module uses implementation of the ESP8266 chip as communication, the chip
It may be designed to a UART-Wi-Fi (serial ports-is wireless) module, which can be with other serial equipment communicatings, built-in TCP/
The conversion between serial ports and Wi-Fi may be implemented in IP agreement.
The buzzer module uses piezo buzzer, is triggered by high level, and the triode of buzzer module is as drive
Dynamic amplification driving current, so as to allow buzzer to make a sound.When the port single-chip microcontroller BEEP exports high level, triode is led
Logical, collector current is made a sound by buzzer, buzzer；When the port single-chip microcontroller BEEP exports low level, triode is cut
Only, no electric current flows through buzzer, and buzzer does not make a sound.
Segment liquid crystal (LCD) display module show that each " 8 " word is made of 7 pixels using " 8 " field, can be with
Display this ten numbers from 0 to 9.Meanwhile in order to enrich display function, " mg/L ", " % " and " DEG C " three have been added in segment liquid crystal
A icon, to realize that the conversion of salt angle value and the necessary temperature value of not commensurate are shown.
Utility model works process is as follows: when power supply and on-off circuit module are opened, system boot, and buzzer prompt tone
It rings twice, single-chip microcontroller combination analog-digital converter ADC, controls the simulation of conductivity detection module and temperature collecting module output
The real-time voltage value of signal, is converted to salting liquid conductivity and temperature value, by conductivity according to salinity calculation formula C=0.5699
× K-881.1031 can calculate salt angle value C, and wherein K indicates conductivity, and pass through segment liquid crystal (LCD) display module for salt
Angle value and temperature value are shown；Meanwhile Wi-Fi data transmission module salt angle value and temperature Value Data can be transferred to mobile phone or
Terminal carries out the reception, arrangement and preservation work of data.
The utility model has the advantages that compared with prior art, the technical solution of the utility model has technical effect beneficial below:
A kind of portable salinometer based on STM8L052 single-chip microcontroller of the utility model is easy to carry, easy to operate, and
Have the advantages that the readable high and data of data can be wirelessly transferred；Portable salinity meter systems external form is small and exquisite easy to carry, core
The measuring system of the heart is conductivity detection module and temperature collecting module, with one piece of segment liquid crystal real-time display salinity and temperature number
According to measurement data mode can be transmitted to mobile phone or terminal by wireless communication, and user is facilitated to measure Salinity Data simultaneously
It is recorded and is arranged.The utility model can be used for the salimity measurements such as scientific research, food and beverage, have stronger practical value.
Detailed description of the invention
Fig. 1 is system structure diagram；
Fig. 2-1 is power supply and switching circuit schematic diagram；
Fig. 2-2 is system hardware schematic diagram；
Fig. 3 is main program flow chart；
Fig. 4 is conductivity measurement program flow diagram；
Fig. 5 is display program flow diagram；
Fig. 6 is that ESP8266 module sends data program flow chart.
Specific embodiment
The technical solution of the utility model is further described with reference to the accompanying drawings and examples.
A kind of portable salinometer based on STM8L052 single-chip microcontroller described in the utility model, as shown in Figure 1, including single
Piece machine module, power supply and on-off circuit module, temperature collecting module, conductivity detection module, Wi-Fi data transmission module, bee
Device module of ringing and segment liquid crystal (LCD) display module.
For hardware elementary diagram as shown in Fig. 2-1 and Fig. 2-2, one-chip computer module chip uses STM8L052, power supply and switch electricity
Enable port power_en, power supply power supply port batt_ad, the switch key port key_monitor of road module are separately connected
Single-chip microcontroller PD5, PB4, PC0 pin are to system power supply, supply voltage 3.3V.PB0~PB2 pin of single-chip microcontroller passes through conducting wire point
Not Lian Jie conductivity measurement module low-level input mouth cont_low, supply voltage input port conductivity_ad
Two electrodes, which are formed, with high level input port cont_hight, PB0 and PB2 pin provides friendship for the conductivity measurement module
Galvanic electricity pressure, the supply voltage of the conductivity measurement module access PB1 pin after filtering by capacitor C3；PB3 pin connection temperature
The supply voltage input port temp_ad of acquisition module is spent, voltage acquisition is controlled and calculates temperature；PA4~PA6, PD1, PA7,
PE0~PE5, PD0, PD2~PD3 pin pass through the data unit display port lcd_com0 of conducting wire and segment liquid crystal display module
~lcd_com2, lcd_com3, digital display port lcd_seg0, lcd_seg1~lcd_seg6, lcd_seg7, lcd_seg8
~lcd_seg9 connection；PC2~PC7 pin is sent by the data receiver RX of conducting wire and Wi-Fi data transmission module, data
TX, serial communication I/O port GPIO2 connects with GPIO0, high level input port CH_PD with reseting port RST at end, PC3 with
Transmitting terminal and receiving end of the PC2 respectively as wirelessly transmitting data；PC6 is Wi-Fi data transmission module power supply, high level
Effectively；Buzzer module uses piezo buzzer, the PA0 foot phase of the voltage input port BEEP and single-chip microcontroller of buzzer module
Even, high level is effective.
The one-chip computer module uses 8-bit MCU, the STM8L052 single-chip microcontroller of STM8L super low-power consumption series, port
Quantity and LCD driving capability are sufficient for the utility model use demand, and inside possesses 12 ADC in 25 channels, acquire number
According to precision can be guaranteed, while STM8L052 single-chip microcontroller also meets the utility model and data processing speed is wanted
It asks, in addition, the price of STM8L052 single-chip microcontroller is more appropriate, hardware cost can be greatly reduced.
The power supply and on-off circuit module include power supply, DC/DC voltage up converting circuit and switching circuit.To realize
The utility model portable function, using No. 5 batteries as system power supply power supply, the voltage of every batteries is 1.5V, two batteries
The voltage being provided in series is 3V, drive system can be worked normally well, since the utility model is low-power dissipation system,
Battery capacity also uses longer time enough.In addition, for a SCM system with more peripheral hardware, to working power
Stability requirement it is higher, single-chip microcontroller cannot be caused to reset because of low-voltage due to fluctuations in the power supply, due to the supplied character of battery,
With the reduction of battery capacity, the voltage of battery can be reduced, so need voltage-stabilizing device to be protected and be gone to interfere to circuit,
The normal operation of realization system.DC/DC voltage up converting circuit selects HX3001 chip, such DC/DC boost converter chips tool
There is PWM to control synchronizing function, chip performance is well matched with the power supply of the utility model battery, can meet boosting and pressure stabilizing simultaneously
Primary demand, and output power be also able to satisfy driving all peripheral hardwares of the utility model.Switching circuit includes a positive-negative-positive
Metal-oxide-semiconductor AP2305N, two NPN type triodes 9013, the interrupt routine of switching circuit combination single-chip microcontroller may be implemented abundant
Operating function.Switching circuit and DC/DC voltage up converting circuit collective effect realize power supply and switching on and shutting down control to whole system
System.
The temperature collecting module selects thermistor as temperature acquisition device, realizes water-proof function and required space is tied
Structure is smaller.Using 10K resistance as reference standard, thermistor both end voltage is acquired by the ADC of single-chip microcontroller, passes through collection voltages
Calculate the resistance value of thermistor, finally according to resistance value table temperature value, the range of value is 0~99 degree Celsius.
Two beckets being placed in parallel constitute required conductivity probe in the conductivity detection module, also cry
Test nipple, two beckets are equivalent to the metal plate in conductivity test philosophy, and two metal ring parts are not connected to one and lead
Line connects PB0 the and PB2 pin port of single-chip microcontroller STM8L052, provides voltage to becket by the two ports, forms electricity
Pole.Measurement can obtain the distance of becket area and electrode, when popping one's head in into the water, be equivalent between two beckets and concatenated one
A resistance measures the voltage value of becket one end using the principle of resistance series connection partial pressure, and calculates the resistance formed by conductance
Value.
Wherein, salinity and conductivity relation are as follows: according to the data of a large amount of actual measurements, total salinity C (mg/L) and electricity
There are following relationships between conductance K (μ S/cm) and water temperature t (DEG C):
It finds during the test, within the scope of 0040 DEG C of this room temperature, influence of the temperature to salt angle value exists temperature range
Within the scope of ± 1000mg/L, when with " % " being that unit is shown, the influence of the salt angle value shown to system is little, can ignore temperature
It is worth the influence to this system measurement result.For temperature range at 0010 DEG C, saliferous total amount variation with temperature is very big, temperature range
At 10040 DEG C, saliferous total amount variation with temperature approach is gentle.When conductivity is larger, salinity altercation is larger.It is practical
15 of salinity and conductivity are measured respectively in the case where 25 DEG C of room temperature by deploying the salting liquid of various concentration when measurement
Surveyed sample point is fitted to once linear function using Matlab by sample.Conductivity and salinity are measured by conductivity sensor
Value is approximate linear, is fitted 15 points by Matlab to obtain total salinity C (mg/L) and conductivity K (μ S/
Cm once linear function formula) is C=0.5699 × K-881.1031 (2)
The Wi-Fi data transmission module uses implementation of the ESP8266 chip as communication, the chip
It may be designed to a UART-Wi-Fi (serial ports-is wireless) module, which can be with other serial equipment communicatings, built-in TCP/
The conversion between serial ports and Wi-Fi may be implemented in IP agreement.
The buzzer module uses piezo buzzer, is triggered by high level, and the triode of buzzer module is as drive
Dynamic amplification driving current, so as to allow buzzer to make a sound.When the port single-chip microcontroller BEEP exports high level, triode is led
Logical, collector current is made a sound by buzzer, buzzer；When the port single-chip microcontroller BEEP exports low level, triode is cut
Only, no electric current flows through buzzer, and buzzer does not make a sound.
Segment liquid crystal (LCD) display module show that each " 8 " word is made of 7 pixels using " 8 " field, can be with
Display this ten numbers from 0 to 9.Meanwhile in order to enrich display function, " mg/L ", " % " and " DEG C " three have been added in segment liquid crystal
A icon, to realize that the conversion of salt angle value and the necessary temperature value of not commensurate are shown.
The utility model, as main control chip, cooperates ADC and power supply and switching circuit, control using STM8L052 single-chip microcontroller
Conductivity detection module, temperature collecting module, Wi-Fi data transmission module, buzzer module.Tthe utility model system software is set
Meter uses modularization programming, including conductivity values reading program, temperature value reading program, LCD to show program and Wi-Fi transmission
Program.Wherein, main program first initializes clock, and long-pressing key 1.5 seconds, system boot, buzzer Tip Sound was twice；
Probe, which is put into salting liquid to be measured, every time automatically begins to measure, and after measurement, normally shows measurement data；Key flicking one
It is secondary, primary display icon is adjusted, is sequentially " % ", " mg/L " and " DEG C "；Again after long-pressing key 1.5 seconds, system closedown, hair
Prompt tone is primary out.System also has electricity-saving function, when system 60 seconds without operation after, system is by automatic shutdown.Main flow
Journey figure is as shown in Figure 3.
The conductivity probe of the conductivity detection module is equivalent to electrode, and electrode is connected in salting liquid, equivalent resistance R
It can be carried out calculating by the voltage after dividing and acquired, the resistance value that equivalent resistance R is measured after tending towards stability is accurate.According to resistance R, electricity
Resistance rate ρ and conductivity K relational expression:L is the distance of electrode, A electrode area, conductivity K can be acquired, by K
It brings into salinity and Conductivity formula (2) and acquires required salt angle value C.Single-chip microcontroller adds the rectangular signal of 50KHz on probe,
Guarantee to form stable ion stream in probe attachment, the measurement of conductivity relies on 12 ADC in single-chip microcontroller inside to electrode one end
Voltage measures.System is achieved the effect that stable by the way of adding 500 signals.Meanwhile ADC is taken survey 20 times and is made even
The mode of mean value acquires data.Conductivity measurement program flow diagram is as shown in Figure 4.
The segment liquid crystal display module can show every time new number with the numerical value of displays temperature and three kinds of numerical value units
According to, it is necessary to clear screen processing is carried out to LCD, prevents data corruption.Meanwhile in order to ensure the stability of system, what is be switched on every time is first
Initial value is disposed as zero, and the identity transformation after key flicking goes in a fixed order every time.In driving journey
When writing of sequence, the display function needs of every one unit of increase are by the pin driving of each " 8 " field code position and each
The coding of the display driving of number redefines one time.Show that program flow diagram is as shown in Figure 5.
The ESP8266 chip of the Wi-Fi data transmission module is to realize channel radio in such a way that serial ports turns Wi-Fi
Letter, single-chip microcontroller need the data of transmission being converted to character string, export character string by serial ports and transmit mould to Wi-Fi data
Block, AT instruction control will be carried out to the module by sending data every time, which be also the form of character string, and the character
String is necessary for " r n " ending, and after data are transmitted, single-chip microcontroller sends one " SEND OK " instruction and gives the transmission of Wi-Fi data
Module.After Wi-Fi data transmission module issues data, mobile phone or terminal are as receiving end, after receiving data
Data are restored by host computer to be displayed on the screen or store in a device, and calling is facilitated to analyze.ESP8266 module sends number
It is as shown in Figure 6 according to program circuit.
Claims (9)
1. a kind of portable salinometer based on STM8L052 single-chip microcontroller, it is characterised in that: the salinometer include one-chip computer module,
Power supply and on-off circuit module, temperature collecting module, conductivity detection module, Wi-Fi data transmission module, buzzer module and
Segment liquid crystal display module；The one-chip computer module uses STM8L052 single-chip microcontroller；The power supply and on-off circuit module make
Can port, power supply power supply port, switch key port be separately connected PD5, PB4, PC0 pin of single-chip microcontroller；The conductivity is surveyed
Low-level input mouth, the supply voltage input port of amount module draw with PB0~PB2 that high level input port connects single-chip microcontroller
Foot, PB0 and PB2 pin form two electrodes and provide alternating voltage for conductivity measurement module, the conductivity measurement module
Supply voltage accesses PB1 pin after filtering by capacitor C3；The supply voltage input port of the temperature collecting module connects single
The PB3 pin of piece machine；The data unit display port of the segment liquid crystal display module and digital display port and single-chip microcontroller
PA4~PA6, PD1, PA7, PE0~PE5, PD0, PD2~PD3 pin connection；The data of the Wi-Fi data transmission module connect
Receiving end mouth, data sending terminal mouth, the port serial communication I/O GPIO2 and GPIO0, high level input port and reseting port and list
PC2~PC7 pin of piece machine connects, the transmitting terminal and receiving end of PC3 and PC2 respectively as the Wi-Fi data transmission module；
PC6 is Wi-Fi data transmission module power supply, and high level is effective；The voltage input port BEEP of the buzzer module with
The PA0 foot of single-chip microcontroller is connected, and high level is effective.
2. a kind of portable salinometer based on STM8L052 single-chip microcontroller according to claim 1, it is characterised in that: described
Power supply and on-off circuit module include power supply, DC/DC voltage up converting circuit and switching circuit.
3. a kind of portable salinometer based on STM8L052 single-chip microcontroller according to claim 2, it is characterised in that: described
DC/DC voltage up converting circuit selects HX3001 chip.
4. a kind of portable salinometer based on STM8L052 single-chip microcontroller according to claim 2, it is characterised in that: described
Switching circuit includes a positive-negative-positive metal-oxide-semiconductor AP2305N, two NPN type triodes 9013, in switching circuit combination single-chip microcontroller
Disconnected program realizes operating function；Switching circuit and the DC/DC voltage up converting circuit collective effect realize the confession to whole system
Electricity and switching on and shutting down control.
5. a kind of portable salinometer based on STM8L052 single-chip microcontroller according to claim 1 to 4, feature exist
In: the temperature collecting module selects thermistor as temperature acquisition device.
6. a kind of portable salinometer based on STM8L052 single-chip microcontroller according to claim 1 to 4, feature exist
In: the conductivity detection module includes two beckets being placed in parallel, and two metal ring parts are not connected to a conducting wire
PB0 the and PB2 pin port for connecting single-chip microcontroller provides voltage to becket by the two ports, forms electrode.
7. a kind of portable salinometer based on STM8L052 single-chip microcontroller according to claim 1 to 4, feature exist
In: the Wi-Fi data transmission module uses ESP8266 chip, which is designed to UART-Wi-Fi module.
8. a kind of portable salinometer based on STM8L052 single-chip microcontroller according to claim 1 to 4, feature exist
In: the buzzer module uses piezo buzzer.
9. a kind of portable salinometer based on STM8L052 single-chip microcontroller according to claim 1 to 4, feature exist
In: the segment liquid crystal display module shows that data, each 8 field are made of 7 pixels using 8 fields.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021238543A1 (en) * | 2020-05-29 | 2021-12-02 | 科大智能科技股份有限公司 | Wireless temperature measurement system and temperature measurement method therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021238543A1 (en) * | 2020-05-29 | 2021-12-02 | 科大智能科技股份有限公司 | Wireless temperature measurement system and temperature measurement method therefor |
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| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Nanjing Huagao Ecological Environment Remote Sensing Technology Research Institute Co.,Ltd. Assignor: Nanjing University of Information Science and Technology Contract record no.: X2022980021474 Denomination of utility model: A Portable Salinometer Based on STM8L052 Single Chip Microcomputer Granted publication date: 20191029 License type: Common License Record date: 20221111 |
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| EE01 | Entry into force of recordation of patent licensing contract |