CN204155406U - A kind of anoxic alarm wrist strap - Google Patents
A kind of anoxic alarm wrist strap Download PDFInfo
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- CN204155406U CN204155406U CN201420594152.4U CN201420594152U CN204155406U CN 204155406 U CN204155406 U CN 204155406U CN 201420594152 U CN201420594152 U CN 201420594152U CN 204155406 U CN204155406 U CN 204155406U
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- alarm
- wrist strap
- chip microcomputer
- anoxic
- oxygen sensor
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Abstract
The utility model provides a kind of anoxic alarm wrist strap, it is characterized in that, comprise wrist strap body, described wrist strap body is fixed with circuit part, described circuit part comprises oxygen sensor part, Temperature Humidity Sensor, single-chip microcomputer, power pack and alarm part, and described single-chip microcomputer connects Temperature Humidity Sensor, power pack, alarm part and oxygen sensor part.The utility model can be the operator easily sent out in space in airtight or the anoxic such as not smooth of ventilating and provides labour protection.This wristband constructions is simple, use is easy, wear conveniently, by introducing humiture correction, can make it within the scope of larger ambient temperature and humidity, all provide comparatively accurately reliable alarm.Alarm mode is undertaken by the feel of body thoughts and feelings, under noisy environment, also have good warning effect.
Description
Technical field
The utility model relates to a kind of wrist strap that can carry out alarm under low-oxygen environment to wearer.
Background technology
Oxygen is that human body carries out the indispensable material of vital movement.But airtight or ventilate in smooth space at drive, warehouse, clamp and subterranean pipe line etc., oxygen concentration is often lower than needed by human body.Under operating personnel enters into anaerobic environment, there will be uncomfortable in chest, dizzy, weak symptom.If situation is serious, operating personnel's unconsciousness, stupor shock will be caused.China there occurs a lot of casualty accident caused due to anoxic in recent years.If anoxic warning information can be provided in real time for operating personnel, the incidence of similar accident can be reduced largely.
Traditional oxygen monitoring equipment volume is comparatively large, is not easy to operating personnel and carries.In recent years along with the progress of embedded technology and material technology, wearable system and oxygen sensor are obtained for and develop largely.Wearable system is a kind of wearable on health, is convenient to carry out with oneself movable small electronic equipment.It is widely applied in fields such as health monitoring, behavior pattern management, intelligent clothing and mobile terminals.Along with the improvement of manufacture of semiconductor technique, the characteristic of single-chip microcomputer low-power consumption of new generation is very outstanding.The power consumption of part low-power scm even can be reduced to the nanowatt order of magnitude.And the volume of oxygen sensor of new generation also has and reduces largely, its amplitude output signal stability is high and gather easily.Part manufacturer is also proposed specially for the product of portable set.Relative to the wearable device based on vest, glasses or necklace etc., wristband constructions is simple, wearing is convenient, little to the normal work influence of operator.Wearable device based on wrist strap also can utilize easily skin feel and operator mutual.In conjunction with above technology and method, be expected under the prerequisite meeting anoxic alarm precision and reliability, formed be convenient to wear, solution with low cost.
Summary of the invention
Technical problem to be solved in the utility model is for anoxic risk existing in the airtight or not smooth environment of ventilating, and provides anoxic alarm by Intelligent spire lamella for operator, reduce due to anoxic cause the probability of happening of casualty accident.This Intelligent spire lamella needs to have that structure is simple, with low cost, dependable performance, volume are little and the feature of longevity of service, and it also needs can provide accurate warning information in larger temperature humidity range.
In order to solve the problems of the technologies described above, the utility model provides a kind of anoxic alarm wrist strap, it is characterized in that, comprise wrist strap body, described wrist strap body is fixed with circuit part, described circuit part comprises oxygen sensor part, Temperature Humidity Sensor, single-chip microcomputer, power pack and alarm part, and described single-chip microcomputer connects Temperature Humidity Sensor, power pack, alarm part and oxygen sensor part.
Preferably, described wrist strap body is stockinette.
Preferably, described oxygen sensor part comprises oxygen sensor and amplifier, and amplifier connects oxygen sensor and single-chip microcomputer.
More preferably, described amplifier is LT6001, LT6003 or AD8602 type amplifier.
Preferably, described Temperature Humidity Sensor is SHT11 digital temperature-humidity sensor.
Preferably, described single-chip microcomputer is PIC16F690 single-chip microcomputer.
Preferably, described alarm part comprises 1027 type mobile phone vibrating motor and LED.
The single-chip microcomputer of anoxic alarm Intelligent spire lamella of the present utility model is the core processing part of system.Single-chip microcomputer is periodically sampled to the output of oxygen sensor part and the output of Temperature Humidity Sensor according to fixed time interval, and is revised according to ambient temperature and humidity data by the oxygen density value obtained, and obtains the actual value of oxygen concentration.Oxygen sensor part of the present utility model comprises oxygen sensor and amplifier.Because the oxygen sensor volume based on aeration cell structure (Faraday's law) is little, stable performance, can be used as Intelligent spire lamella join the first-selection of oxygen sensor.The output amplitude of aeration cell is less, connects amplifier to improve after sampling precision needs.The AD input pattern can supported according to single-chip microcomputer and wrist band size restriction, selection high-precision amplifying (as LT6001, LT6003, AD8602 etc.) builds single-ended or difference output.Temperature Humidity Sensor of the present utility model is used for providing calibration, the digital temperature-humidity sensor parts that integrated level is high, precision is high, volume is little such as recommendation SHT11 for the output of oxygen sensor.Power pack of the present utility model comprises battery, linear voltage regulator and input divider resistance.The battery of mobile phone that battery can select the 3.7V such as BL-5C to export.Linear voltage regulator need meet low pressure drop condition, and pressure drop need be selected to be less than the model of battery normal output voltage and single-chip microcomputer operating voltage pressure difference 80%.Cell output voltage sends into single-chip microcomputer by resistance ratio dividing potential drop.This voltage and the battery low pressure reference threshold preset compare by single-chip microcomputer, if the partial pressure value of voltage is less than this reference threshold, triggers battery altering and remind.The mode of Digital Logic or analog comparator can be selected relatively time to realize.Consider in operating environment there is larger neighbourhood noise, so anoxic alarm wrist strap adopts body sense alarm mode.After single-chip microcomputer finds that environmental oxygen levels is lower than alarm threshold, be then arranged in by triggering one that the flat vibration motor of wrist strap near skin side is logical carries out alarm.Coordinate a LED on this basis, as minor alarm condition discrimination.Above low-power scm, oxygen sensor part, Temperature Humidity Sensor, power pack are all arranged on one piece of PCB, and element adopts the surface mount packages of miniaturization as far as possible.This PCB is fixed on by the mode of making on the wrist strap body that is made up of stockinette.Flat vibration motor is arranged on the inner side of wrist strap body near skin.The utility model is that core builds Intelligent spire lamella by the oxygen sensor of low-power scm and miniaturization, provides Real-time Alarm effectively reliably when operator faces anaerobic environment.Wrist strap is also included microminiaturized Temperature Humidity Sensor in order to calibrate oxygen sensor data, improve alarm precision.Wish by this anoxic alarm Intelligent spire lamella for the operator worked under the multiple environment of anoxic provides safety precautions, reduce the security incident generation that anoxic causes.
Compared with prior art, the beneficial effects of the utility model are:
The utility model proposes a kind of Intelligent spire lamella that can be used for anoxic alarm, can be the operator easily sent out in space in airtight or the anoxic such as not smooth of ventilating and labour protection is provided.This wristband constructions is simple, use is easy, wear conveniently, by introducing humiture correction, can make it within the scope of larger ambient temperature and humidity, all provide comparatively accurately reliable alarm.Alarm mode is undertaken by the feel of body thoughts and feelings, under noisy environment, also have good warning effect.
Accompanying drawing explanation
Fig. 1 is anoxic alarm wristband system structural drawing;
Fig. 2 is PIC16F690 Fundamentals of Mono-Chip Computers figure;
Fig. 3 is PIC16F690 downloader interface section;
Fig. 4 is power pack schematic diagram;
Fig. 5 is oxygen sensor partial schematic diagram;
Fig. 6 is Temperature Humidity Sensor partial schematic diagram;
Fig. 7 is alarm partial schematic diagram;
Embodiment
For making the utility model become apparent, hereby with preferred embodiment, and accompanying drawing is coordinated to be described in detail below.
Embodiment
As shown in Figure 9, for anoxic alarm wristband constructions schematic diagram, described anoxic alarm wrist strap, comprise wrist strap body 1, described wrist strap body 1 is fixed with circuit part 2, as shown in Figure 2, described circuit part 2 comprises oxygen sensor part, Temperature Humidity Sensor, single-chip microcomputer, power pack and alarm part, and described single-chip microcomputer connects Temperature Humidity Sensor, power pack, alarm part and oxygen sensor part.Described oxygen sensor part comprises oxygen sensor and amplifier, and amplifier connects oxygen sensor and single-chip microcomputer.
The PIC16F690 single-chip microcomputer of Wei Xin company (MicroChip) selected by described single-chip microcomputer, and this single-chip microcomputer is 20 pin, 8 the CMOS flash memory single-chip microcomputers adopting nanowatt technology.It has with low cost, power consumption is lower, feature richness and the high feature of stability.Oxygen sensor selects the 4OXV oxygen sensor of city technology company (CITY Technology), and its output signal connects 100 ohm load, and is amplified by AD8602 amplifier.Temperature Humidity Sensor selects the SHT11 digital temperature-humidity sensor of Sensirion company.Low pressure difference linear voltage regulator uses HT7333 pressure reduction linear voltage regulator, and it exports as 3.3V.Alarm part selects 1027 type mobile phone vibrating motors.
The schematic diagram of PIC16F690 single-chip microcomputer as shown in Figure 2.What in embodiment, PIC16F690 single-chip microcomputer adopted is that the wide bar SOIC-20 of 7.50mm encapsulates, and its power supply input pin connects 0.1 μ F decoupling capacitor of one 0805 encapsulation.Because the present embodiment is very not strict to sequential, so adopt PIC16F690 internal oscillator as major clock in embodiment.PIC16F690 single-chip microcomputer internal oscillator frequency selects position IRCF<2:0> to be configured to 111, generates 8MHz internal clocking, by its synchronous inner sequential.PIC16F690 single-chip microcomputer is downloaded by PICKIT, and downloader interface section as shown in Figure 3.Because wrist strap requires strict to the physical dimension of PCB and the complexity of program is lower, so eliminate the reset key of downloader interface section in embodiment.Wrist strap resets and adopts power-off restarting reset mode.
Power pack selects BL-5C battery, uses to weld contact pin and be connected between its with wrist strap circuit board.Power pack adopts HT7333 low pressure difference linear voltage regulator (T0-92 encapsulation), and it exports pressure reduction only has 90mV.The output voltage of HT7333 low pressure difference linear voltage regulator is fixing 3.3V.Can to ensure that in the normal range of operation of BL-5C PIC16F690 can obtain stable 3.3V so preferably to power.The input and output of HT7333 low pressure difference linear voltage regulator all adopt AVX10 μ F tantalum electric capacity to carry out filtering, and it is encapsulated as 1206.The output voltage of BL-5C battery is input in the AN7 pin of PIC16F690 by 1: 1 electric resistance partial pressure.Schematic diagram corresponding to power pack as shown in Figure 4.
The schematic diagram of oxygen sensor part as shown in Figure 5.What 40XV exported is current signal, needs an external low resistance resistance to be converted into voltage signal.Select the load that 100 ohm of 1% precision resistance exports as 40XV herein.Because the voltage signal produced through said process is comparatively faint, also need to amplify it.The AD8602 amplifier (SOIC-8 encapsulation) using AD company to produce in the present embodiment amplifies it, and enlargement factor is set as 1: 101.As shown in Figure 5, the resistance adopted is all 1% precision resistance of 0805 encapsulation to resistance value.The energization input of AD8602 amplifier connects 0.1 μ F electric capacity of one 0805 encapsulation, and output terminal is connected with the AN5 port of PIC16F690 single-chip microcomputer.
Schematic diagram corresponding to Temperature Humidity Sensor as shown in Figure 6.The serial clock input port of SHT11 digital temperature-humidity sensor is connected with No. 11 pins of PIC16F690 single-chip microcomputer.No. 13 pins of PIC16F690 single-chip microcomputer are used as transmitting bi-directional serial data between SHT11 digital temperature-humidity sensor.SHT11 digital temperature-humidity sensor Measurement Resolution is default value (temperature 14bit, humidity 12bit).Bidirectional serial data lines between SHT11 digital temperature-humidity sensor and PIC16F690 single-chip microcomputer uses 0805 to encapsulate, 1% precision resistance pull-up of 10K resistance.Decoupling is carried out with the 0805 encapsulation electric capacity of 0.1 μ F at the feeder ear of SHT11 digital temperature-humidity sensor.
The alarm part of wrist strap is made up of 1027 type mobile phone vibrating motors and LED, and corresponding schematic diagram as shown in Figure 7.The RC5 port of PIC16F690 single-chip microcomputer connects a MMBT8050 triode (SOT-23 encapsulation), and mobile phone vibrating motor is connected on the collector of MMBT8050 triode.When RC5 port is high level, MMBT8050 triode ON, 1027 type mobile phone vibrating motor work; Otherwise then 1027 type mobile phone vibrating motors stop.At the two ends of 1027 type mobile phone vibrating motors, a fly-wheel diode (VCC) in parallel.Fly-wheel diode selects the UDZS TE-17 type (SOD-323 encapsulation) of rom semiconductor.Use 0805 of 0.1 μ F to encapsulate electric capacity at the link of VCC and 1027 type mobile phone vibrating motors and carry out decoupling.Because PIC16F690 single-chip microcomputer has stronger pin current driving ability, so directly hold the current-limiting resistance of connection one red LED and 330 ohm at the RC4 of PIC16F690 single-chip microcomputer, LED and 330 Ohmages are all 0805 encapsulation.
The length of PCB layout plate of the present utility model is 2180mil, and width is 1100mil (1000mil=2.54cm).PCB reverse side applies copper floor file.There is the through wires hole for making in the corner of PCB, it is fixed on wrist strap body by the mode of making.Wrist strap body is made up of stockinette, can with reference to the selection of wrist protector for sports and making in specific implementation.In the present embodiment, wrist strap body selects black spandex stretch fabric, and its tile size is 10cm × 15cm.The pcb board mode of making is fixed therein on heart position, then fabric minor face is sewed up.Make fixing mode to realize simply, and less to operator's wrist Activity Effects in wearing.For avoid PCB and on element be directly exposed in operating environment, need cover one deck stockinette more thereon, the size of fabric is chosen flexibly according to the physical dimension of PCB.
Workflow of the present utility model is as follows:
[1] after system electrification, first single-chip microcomputer monitors the cell voltage after dividing potential drop, if find that cell voltage is too low, is then reported to the police by LED and vibrating motor.
[2] after the powered battery detection that powers on is without exception, then normal mode of operation is entered.Single-chip microcomputer is periodically sampled to the output of oxygen sensor part every Fixed Time Interval (time interval A can be set to the several seconds to tens of second), and reads the environmental parameter obtained by Temperature Humidity Sensor measurement.All utilize the measured value of environmental parameter correction oxygen sensor after completing each reading, obtain environmental oxygen levels actual value.
[3] if find that ambient oxygen concentration is lower than threshold value, then enter anoxic alert mode.Single-chip microcomputer starts to monitor oxygen sensor part and ambient temperature and humidity with shorter interval (time interval B can be set to and be less than 1 second), sets a regular length, for storing the sampled data array of oxygen concentration actual value simultaneously.Be averaged after the data first time in array fills up, if mean value is still lower than threshold value, then triggering flat vibration motor and LED send alarm.
[4] after sending alarm, single-chip microcomputer continues to monitor oxygen sensor part and humiture according to sampling interval B, and the ambient oxygen concentration actual value calculated is continued write array.Wiring method is that data below move forward successively by a zeros data the oldest in array.Finally up-to-date oxygen concentration actual value is placed on and is shifted on the position vacated.After write operation, data in array are averaged each time, if array mean value is lower than alarm threshold, proceed to report to the police; If higher than threshold value, then stop alarm.
[5] when wrist strap works in normal mode of operation, after completing the measurement to oxygen concentration, then cell voltage is measured at every turn.If low charge condition does not appear in battery, then system enters dormant state, carries out the monitoring of a new round after elapsed time interval A again.
[6] if find that battery electric quantity is low, then battery low-electricity quantity alert mode is entered.Single-chip microcomputer triggers flat vibration motor and LED sends alarm.Single-chip microcomputer continues to sample to ambient oxygen and humiture with time interval A, if find anoxic conditions, then enters anoxic alert mode.
[7] flat vibration motor distinguishes corresponding anoxic alarm and battery low-electricity quantity alarm from the different vibration modes of LED.As normal in LED bright in conjunction with the corresponding battery low-electricity quantity alarm of flat motor intermittent control shaking; LED flicker is in conjunction with the corresponding anoxic alarm of vibrating motor sustained vibration.
4OXV oxygen sensor can regard a kind of current source as, and the size of its output current depends on oxygen reaction speed.This reaction velocity can be subject to the impact of ambient temperature and humidity, and it exports data in addition also needs to revise according to concrete oxygen concentration.System when initial configuration, all at 20 degrees Celsius of dry air alignments.In system works, sample PI C16F690 single-chip microcomputer all successively can collect oxygen concentration data and humiture data each time.Warm and humid angle value is utilized to calibrate oxygen concentration in embodiment.It is maximum that humidity changes the oxygen concentration deviation caused.In the present embodiment, descending slope K (t) that oxygen concentration under following formulae discovery different temperatures (t) changes with humidity is utilized:
K(t)＝9.25e-4×(t-20)
2+0.0355×(t-20)+1.12
In formula, e is math constant, e=2.72.
Obtain the oxygen concentration under different temperatures with change slope K (t) of humidity after, utilize formula below, by measured oxygen concentration value O
mobtain humidity (H represents with number percent) revised oxygen concentration O
hR:
O
HR＝K(t)×H+O
m
After completing humidity correction, can correct the error caused due to temperature on this basis.4OXV exports the constant amplitude increased, so can directly be multiplied by weighted value 0.98 as temperature corrected value in humidity modified value when temperature is greater than 20 degrees Celsius.If environment temperature is less than 20 degrees Celsius, the at this moment output of 4OXV can be thought to reduce linear reduction with temperature.Oxygen concentration temperature corrected value O
tRcan be obtained by following formula:
O
TR＝0.02375×(20-t)+O
HR
After this, revise to the nonlinearities change of oxygen concentration, obtain oxygen concentration actual value.Due to the design for be anoxic alarm application, so the mode of weighting can be used avoid more complicated logarithm operation.Oxygen concentration actual value O
tfollowing formulae discovery can be utilized:
O
T＝O
TR/0.9925
PIC16F690 single-chip microcomputer is after upper electro-detection is without exception in an embodiment, enters normal mode of operation.Sample every (time interval A) output to oxygen sensor in 5 seconds, and read the humiture data of SHT11 digital temperature-humidity sensor.If find that environmental oxygen levels is lower than 18% (anoxic decision threshold), then enter anoxic alert mode.PIC16F690 single-chip microcomputer is with 0.5 second (time interval B) for monitoring oxygen sensor and ambient temperature and humidity data at interval, and the oxygen concentration data obtained each time are stored in the one-dimension array of a n=16.After array is filled up, be then averaged.If RC5 pin is still just set high level lower than 18%, PIC16F690 single-chip microcomputer by average, open 1027 type mobile phone vibrating motors.And with 0.5 second for the cycle make on RC4 pin level height cyclical variation, cause LED to glimmer.
After the alarm of triggering anoxic, PIC16F690 single-chip microcomputer still monitors oxygen concentration and humiture data with 0.5 second (time interval B), and computing environment oxygen concentration actual value.When to storage of array data, first array the 1st element is reset, then by follow-up 15 element reaches.And oxygen concentration actual value write last position of array that will at every turn obtain.Be averaged afterwards, if oxygen concentration is still lower than 18%, then continue alarm; As set low level higher than 18%, RC5, RC4 sets low level, closes alarm.PIC16F690 single-chip microcomputer empties array, gets back to normal mode of operation.Recover to sample with (time interval A) output to oxygen sensor in 5 seconds, and read the humiture data of SHT11 digital temperature-humidity sensor.
In the normal mode of operation, after completing the measurement to oxygen concentration, then cell voltage is measured at every turn.If find that the input voltage of AN7 pin is less than 1.75V, then enter battery low-electricity quantity alert mode.RC5 pin for the cycle, periodically will be set to high level with 1 second, and 1027 type mobile phone vibrating motors are periodically vibrated.Now RC4 pin positions high level, makes LED Chang Liang.PIC16F690 single-chip microcomputer continues to sample to ambient oxygen and humiture with 5 second time interval (time interval A), if find anoxic conditions, then enters anoxic alert mode.
Claims (7)
1. an anoxic alarm wrist strap, it is characterized in that, comprise wrist strap body (1), described wrist strap body (1) is fixed with circuit part (2), described circuit part (2) comprises oxygen sensor part, Temperature Humidity Sensor, single-chip microcomputer, power pack and alarm part, and described single-chip microcomputer connects Temperature Humidity Sensor, power pack, alarm part and oxygen sensor part.
2. anoxic alarm wrist strap as claimed in claim 1, it is characterized in that, described wrist strap body (1) is stockinette.
3. anoxic alarm wrist strap as claimed in claim 1, it is characterized in that, described oxygen sensor part comprises oxygen sensor and amplifier, and amplifier connects oxygen sensor and single-chip microcomputer.
4. anoxic alarm wrist strap as claimed in claim 3, it is characterized in that, described amplifier is LT6001, LT6003 or AD8602 type amplifier.
5. anoxic alarm wrist strap as claimed in claim 1, it is characterized in that, described Temperature Humidity Sensor is SHT11 digital temperature-humidity sensor.
6. anoxic alarm wrist strap as claimed in claim 1, it is characterized in that, described single-chip microcomputer is PIC16F690 single-chip microcomputer.
7. anoxic alarm wrist strap as claimed in claim 1, it is characterized in that, described alarm part comprises 1027 type mobile phone vibrating motor and LED.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420594152.4U CN204155406U (en) | 2014-10-15 | 2014-10-15 | A kind of anoxic alarm wrist strap |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420594152.4U CN204155406U (en) | 2014-10-15 | 2014-10-15 | A kind of anoxic alarm wrist strap |
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| CN204155406U true CN204155406U (en) | 2015-02-11 |
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| CN201420594152.4U Expired - Fee Related CN204155406U (en) | 2014-10-15 | 2014-10-15 | A kind of anoxic alarm wrist strap |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104992528A (en) * | 2015-06-09 | 2015-10-21 | 惠州Tcl移动通信有限公司 | Wearable device alarm method and wearable device |
| CN107495553A (en) * | 2017-08-07 | 2017-12-22 | 寇海滨 | A kind of early warning bracelet device |
| CN109793292A (en) * | 2019-03-23 | 2019-05-24 | 薛爱果 | A kind of clothes with wireless charging waterproof positioning function |
| CN109949540A (en) * | 2019-04-03 | 2019-06-28 | 合肥科塑信息科技有限公司 | A kind of artificial intelligence early warning system |
-
2014
- 2014-10-15 CN CN201420594152.4U patent/CN204155406U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104992528A (en) * | 2015-06-09 | 2015-10-21 | 惠州Tcl移动通信有限公司 | Wearable device alarm method and wearable device |
| CN107495553A (en) * | 2017-08-07 | 2017-12-22 | 寇海滨 | A kind of early warning bracelet device |
| CN109793292A (en) * | 2019-03-23 | 2019-05-24 | 薛爱果 | A kind of clothes with wireless charging waterproof positioning function |
| CN109949540A (en) * | 2019-04-03 | 2019-06-28 | 合肥科塑信息科技有限公司 | A kind of artificial intelligence early warning system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150211 Termination date: 20151015 |
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| EXPY | Termination of patent right or utility model |