CN203422472U - Portable intelligent distance meter provided with voice function - Google Patents

Abstract

The utility model relates to a portable intelligent distance measuring instrument with a voice function, which effectively solves the problem of accurately measuring the distance of a radiation source, and can be widely used in various distance measuring occasions such as home, outdoor and even in the field. A display window, a power switch, a distance measuring switch and a temperature recognizer socket, the temperature recognizer socket is equipped with a temperature recognizer connected to the controller, the distance measuring circuit includes a power supply, a controller, the power supply is connected to the controller, and the controller They are respectively connected with ultrasonic transceiver, trigger, decoder and distance measuring switch, the power supply is connected with power switch, voice chip, loudspeaker, decoder and digital display respectively, the trigger is connected with voice chip, and the voice chip is respectively connected with microphone, The loudspeaker is connected, the decoder is connected with the digital display, and the voice chip cooperates with the microphone and the speaker. The utility model has the advantages of simple structure, good use effect, accurate distance measurement, and the measurement result is displayed in both numbers and voice.

Description

A Portable Intelligent Rangefinder with Voice Function

technical field

The utility model relates to an instrument, in particular to a portable intelligent distance measuring instrument with voice function.

Background technique

With the improvement of people's life and the advancement of science and technology, household appliances or medical equipment have entered thousands of households, or public places and related specific workplaces, etc., in order to be efficiently used in daily life and specific work. In order to prevent the radiation or harmful substances produced by electrical appliances from affecting their health, it is necessary to keep people at a certain distance from electrical appliances or harmful substances. How to control an effective safe distance often requires a range finder. Although there are many different types of range finders Model, but due to structural problems, there are problems of one kind or another in use. On the other hand, short-distance building distance measurement, indoor length, width and area measurement, as well as field survey distance measurement and well and mine detection, etc. also require a compact and portable rangefinder with multiple output and display functions. To meet the requirements of different occasions (home, outdoor, etc.).

Ultrasound has strong penetrability, good directivity, small attenuation during transmission, long distance in the medium, and strong reflection ability. It has a wide range of uses and can be used for automatic control, flaw detection, distance measurement, source measurement, etc. The ultrasonic transmitter does not transmit a single pulse, but a series of several pulses, and provides a short pulse to the measurement logic circuit, and the ultrasonic receiver receives the pulse train transmitted by the ultrasonic transmitter, and also provides a short pulse to the measurement logic circuit . Then use the bistable circuit to convert the above two short pulses into a square pulse, and this square pulse is equal to the time interval between the above two short pulses. Measuring the width of this square pulse can determine the distance between the transmitter and the detection object. Using ultrasound to detect is often faster, more convenient, simple to calculate, and easy to implement control. And in terms of measurement accuracy, it can well meet the requirements of industrial control.

Ultrasound is a sound wave with a frequency greater than 20KHZ, and it has the best efficiency when it propagates in the air at a frequency of 40KHZ. Ultrasonic waves at this frequency basically propagate in a straight line, and when encountering obstacles, they can travel along Backtrack. The ultrasonic ranging system is based on the above-mentioned characteristics of ultrasonic waves, using a single-chip microcomputer (ATMEL89C2051 chip) to control the emission and reception of ultrasonic waves, according to the physical formula S=V*t/2 (V is the ultrasonic propagation speed in the air, t is the measured ultrasonic wave Propagation time), so as to measure the target distance, and finally output the result information through the I/O device. Ultrasonic distance measurement is accurate, and no household portable rangefinder developed by ultrasonic has been found so far.

Contents of the invention

In view of the above situation, in order to overcome the defects of the prior art, the purpose of this utility model is to provide a portable intelligent rangefinder with voice function, which can effectively solve the problem of accurately measuring the distance of the radiation source and ensure people's health problems. It can be widely used in various ranging occasions such as home, outdoor and even in the wild.

其中,r为气体的比热值,R为气体常数,T为空气中热力学温度,μ为气体的分子量；声速与热力学温度的平方根成正比,温度越高声速越大，为了计算方便，根据实际经验，超声波在空气中的传播速度可直接换算为：

T用温度传感器采集并送给单片机控制器进行计算，而331.4和273.6均是由前一公式及四个参数换算后得来的，这时超声波速度V就只跟温度T有关了，这就有利于程序设计的实现及计算的简便。温度传感器硬件及本算法的结合，实现了测距中的“温度补偿和校正”机制，大大提高了本测距仪的精确度。The technical scheme solved by the utility model is to include the casing and the ranging circuit in the casing, the front of the casing has a display window, a power switch (S2), a ranging switch (S1) and a temperature identifier socket, and a temperature identifier socket A temperature identifier connected to the controller is installed on the body, the distance measuring circuit includes a power supply and a controller, the power supply is connected to the controller, the controller is connected to the ultrasonic transceiver, trigger, decoder and distance measuring switch, and the power supply Connect with the power switch, voice chip, loudspeaker, decoder, and digital display respectively; the trigger is connected with the voice chip; the voice chip is connected with the microphone and the speaker respectively; the decoder is connected with the digital display; , according to the user's needs, input the pronunciation of "measured distance is", "point", "meter", "0"-"9" in advance, when the system measures the target distance, it will be displayed on the digital display and output Prompt voice; the ultrasonic transceiver is an ultrasonic transmitter and receiver installed together, also known as a sensor, the sensor sends out 40kHz ultrasonic waves, and the controller composed of a single-chip microcomputer starts timing; The wave is sent to the single-chip controller, and the single-chip controller stops timing. The time counted by the single-chip controller is the round-trip time of the ultrasonic wave from the sensor to the measured object. Multiply it by the speed of the ultrasonic wave in the air, and then divide it by 2 to get For the distance to be measured, after the single-chip controller starts timing, as long as the sensor receives the echo, the single-chip controller stops timing, that is, only the first returned ultrasonic wave will work, that is to say, the instrument always measures the distance closest to the sensor. The distance of the object, this is the so-called time difference ranging, and its ranging formula is: S=Vt/2, where V is the propagation speed of the ultrasonic wave in the air, and t is the time for the ultrasonic wave to travel back and forth in the air.

Among them, r is the specific heat value of the gas, R is the gas constant, T is the thermodynamic temperature in the air, μ is the molecular weight of the gas; the sound velocity is proportional to the square root of the thermodynamic temperature, the higher the temperature, the greater the sound velocity, for the convenience of calculation, according to the actual Experience, the propagation speed of ultrasonic waves in the air can be directly converted to:

T is collected by a temperature sensor and sent to the single-chip controller for calculation, and 331.4 and 273.6 are both obtained from the previous formula and the conversion of the four parameters. At this time, the ultrasonic velocity V is only related to the temperature T, which has It is beneficial to the realization of program design and the simplicity of calculation. The combination of temperature sensor hardware and this algorithm realizes the "temperature compensation and correction" mechanism in ranging, which greatly improves the accuracy of the rangefinder.

The utility model has the advantages of simple structure, novelty and uniqueness, good use effect, accurate distance measurement, and effectively solves the problem of harm to the human body and health caused by inaccurate radiation source distance measurement. surveys in special environments, etc.

In addition to using LED display for the measurement results of the utility model, the voice processing module is also successfully introduced into the design, so that the system has the function of displaying the measurement results in numbers and voice, and has a good humanized man-machine interface, which is suitable for very Standard environment (such as strong light exposure environment, dark environment) and suitable for special groups of people (such as visually impaired, hearing impaired).

Description of drawings

Fig. 1 is the perspective view of the external structure of the utility model.

Fig. 2 is a block diagram of the ranging circuit module of the present invention.

Fig. 3 is a circuit structure diagram of the utility model.

Fig. 4 is the main program flow chart of the utility model.

Fig. 5 is a flow chart of the ultrasonic emission processing of the utility model.

Fig. 6 is a flowchart of the recording module of the present invention.

Fig. 7 is a flowchart of the recording module of the present invention.

Fig. 8 is a flow chart of the utility model playback program.

Fig. 9 is a subroutine diagram of the utility model playing PLAY.

Fig. 10 is a flow chart of the display program of the present invention.

Detailed ways

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described in detail.

其中,r为气体的比热值,R为气体常数,T为空气中热力学温度,μ为气体的分子量；声速与热力学温度的平方根成正比,温度越高声速越大，为了计算方便，根据实际经验，超声波在空气中的传播速度可直接写为：T用温度传感器采集并送给单片机控制器进行计算。As shown in Figures 1 and 2, the utility model includes a housing and a ranging circuit in the housing. The front of the housing 1 has a display window 2, a power switch (S2) 3, a ranging switch (S1) 4 and a temperature identifier. Socket 6, the temperature recognizer socket 6 is equipped with a temperature recognizer 5 connected to the controller, the distance measuring circuit includes a power supply, a controller, the power supply is connected to the controller, and the controller is connected to the ultrasonic transceiver, trigger, interpreter, respectively. The coder is connected with the ranging switch 4, the power supply is connected with the power switch 3, voice chip, loudspeaker, decoder and digital display respectively, the trigger is connected with the voice chip, the voice chip is connected with the microphone and the loudspeaker respectively, and the decoder is connected with the digital display The display is connected, and the voice chip cooperates with the microphone and the speaker. According to the user's needs, input the pronunciation of "measured distance is", "point", "meter", "0"-"9" in advance, when the system measures the target distance Finally, after displaying on the digital display, the prompt voice is output; the ultrasonic transceiver is installed together with the ultrasonic transmitter and receiver, and is also called a sensor. When the measured object is reflected back, the sensor receives the echo and sends it to the single-chip controller, and the single-chip controller stops timing. The time counted by the single-chip controller is the round-trip time of the ultrasonic wave from the sensor to the measured object. Divide the speed in the air by 2 to get the distance to be measured. After the microcontroller starts timing, as long as the sensor receives the echo, the microcontroller stops timing, that is, only the first returned ultrasonic wave will work, that is, It is said that the instrument always measures the distance of the object closest to the sensor, which is the so-called time difference ranging, and its ranging formula is: S=Vt/2, where V is the propagation speed of ultrasonic waves in the air, and t is the distance of ultrasonic waves in the air. the time it takes to travel back and forth through the air,

Among them, r is the specific heat value of the gas, R is the gas constant, T is the thermodynamic temperature in the air, μ is the molecular weight of the gas; the sound velocity is proportional to the square root of the thermodynamic temperature, the higher the temperature, the greater the sound velocity, for the convenience of calculation, according to the actual Empirically, the propagation speed of ultrasonic waves in air can be directly written as: T is collected by a temperature sensor and sent to the microcontroller controller for calculation.

In order to ensure the use effect, the specific structure of the control circuit is provided by Fig. 3. In the circuit, the controller IC1 adopts a single-chip integrated control module, and the model is: AT89C2051 single-chip controller; the trigger IC2 is 74LS377 trigger integrated chip, voice chip IC4 is ISD1420 voice integrated chip, decoder IC3 is 74LS47 decoding integrated block, digital display is LED digital tube integrated display block, temperature recognizer 5 is DS18B20 temperature sensing integrated module;

The housing is square, and the display window 2, the power switch 3, the distance measuring switch 4, and the temperature identifier socket 6 are sequentially installed on the front panel of the housing from left to right;

In the above structure, in order to use conveniently and reduce the size, the controller, trigger, voice chip, decoder, and digital display all adopt an integrated modular structure and are installed on the circuit board placed in the housing, wherein: the controller Pin 1 of IC1 is connected to the second key switch S2 through the resistor R1, and the second key switch S2 is connected to the power supply VCC (+5V), capacitor C3, and resistor R3. The resistor R3 is grounded through the series connected diode LED1, and the capacitor C3 is grounded through the series connected resistor R2. ; Pin 2 of controller IC1 is connected to resistor R27 and speaker YS3, pin 4 and pin 5 of IC1 are respectively connected to both ends of the ceramic oscillator JZ, and grounded through capacitor C1 and capacitor C2, pin 6 of controller IC1 is connected to the first button Switch S1, resistance grounding, pin 7 of controller IC1 is connected to resistors R20, R21, capacitor C9, collector of diode NPN4, pin 8 and pin 9 of controller IC1 are connected to trigger IC2, pin 10 of controller IC1 is grounded, control Pin 20 of controller IC1 is connected to power supply VCC, pins 12-19 of controller IC1 are connected to trigger IC2 through a cable, trigger IC2 is connected to voice chip IC4, pin 2 of voice chip IC4 is grounded, pin 14 of voice chip IC4 is connected to 15 The pin is connected to the first speaker YS1, the 16th pin of the voice chip IC4 is connected to the power supply VCC, and grounded through the resistor R8 and the capacitor C5, the 17th pin of the voice chip IC4 is connected to the resistor R9, the microphone MIC through the capacitor C7, the microphone is grounded, the resistor R9 and the resistor R8 and capacitor C5 are connected. Pin 18 of voice chip IC4 is grounded through capacitor C6, pin 19 is grounded through parallel capacitor C8 and resistor R10, capacitor C is installed between pin 20 and pin 21 of voice chip IC4, pin 24 of voice chip IC4 Pin is connected to resistor R7, pin 25 is connected to resistor R6 through diode LED2, resistors R6 and R7 are connected in parallel with resistors R4, R5, capacitor C4 and power supply VCC, capacitor C4, resistor R4, resistor R5 are connected to trigger IC2 and voice chip IC4, translation Pins 3, 4, and 5 of the encoder IC3 are connected to the power supply VCC, and pins 6, 2, 1, and 7 of the decoder IC3 are connected to pins 15, 14, 13, and 12 of the controller IC1. The 14-pin, 15-pin, 9-pin, 10-pin, 11-pin, 12-pin, 13-pin of encoder IC3 are respectively connected to the display LED through the resistor R11-17, and the display LED is connected to the collector of the triode NPN1 and NPN2, and the collector of the triode NPN1 and NPN2 The emitter is connected to the power supply VCC, resistor R27 and the third speaker YS3, the bases of the transistors NPN1 and NPN2 are connected to pins 17 and 16 of the controller IC1 through resistors R18 and R19, and resistors R22, R23, R24, R25, R26 and R28 are connected in parallel Connect resistor R21, resistor R27, third speaker YS3 and power supply VCC, resistor R28 connect second speaker YS2 and base of transistor NPN1, emitter of transistor NPN1 is grounded, collector of transistor NPN1 connects resistor R28, capacitor C12, and Capacitor C12 is connected to resistor R28, transistor N The base of PN2, the emitter of transistor NPN2 are grounded, the collector is connected to resistor R24, capacitor C11, and connected to resistor R23 through capacitor C11, the base of transistor NPN3, the emitter of transistor NPN3 is grounded, and the collector of transistor NPN3 is connected to resistor R22 , capacitor C10, and connected to the base of the transistor NPN4 through the capacitor C10, and the emitter of the transistor NPN4 is grounded.

1. The controller is integrated control module IC1, which adopts AT89C2051 chip minimum single-chip microcomputer system. AT89C2051 has 2k bytes of EPROM, 128 bytes of RAM, 15 I/O lines, two 16-bit timers/counters, and contains precision analog comparison device and on-chip oscillator with 12MHz/24MHz operating frequency. At the same time, there are two 16-bit timer/counter registers Timer0 and Timer1, which are used in the system to control the emission of ultrasonic waves and calculate the propagation time respectively. The circuit structure is shown in part A of Figure 3;

2. The ultrasonic receiving/transmitting module adopts the UCM40 piezoelectric ceramic sensor matching the transmitting head and the receiving head. It generates a 40kHz pulse signal during operation, and recovers the ultrasonic wave after filtering and two-stage amplification circuit. The circuit structure is shown in part B in Figure 3. shown;

3. The temperature identification module is mainly used for temperature compensation and correction. Under different temperature conditions, the speed of sound wave transmission is different. To consider the accuracy of the distance measuring instrument, it is necessary to collect real-time temperature data and feed it back to the microcontroller for each measurement. In this way, the ultrasonic speed used in the system operation can be adjusted in time to improve the accuracy of the rangefinder. In this design, the temperature sensor DS18B20 is used to collect the ambient temperature T and send it to the microcontroller for comprehensive calculation;

4. The digital display function module adopts LED digital tube display. For the convenience of encoding, we use a decoder IC3 that matches the common anode seven-segment digital tube as the 4LS47 decoding integrated module to convert the four-bit input signal into a seven-bit encoded signal. Since the system is designed for civilian life, its accuracy is only set to 0.01m-0.1m. In the design, three LED digital tubes are used to display, controlled by the AT89C2051 chip, and the measurement results can be displayed after the measurement results The value is shown in part C in Fig. 3;

5. The voice recording and playback module is composed of a single-chip voice recording and playback circuit IC4 (ISD1420), a microphone (MIC) and a speaker (SPEAKER). The circuit shares the P1 port of AT89C2051, so a 74LS377 flip-flop should be added to latch the control code. The speaker SPEAKER is connected with the AT89C2051 chip through the ISD1420 voice chip. After the system measures the distance to the target, it can broadcast the measurement result by voice while the LED lights up to display the distance, so as to ensure that it is difficult to accurately identify the LED due to poor eyesight or strong light. The normal use of the system under special conditions such as data. Moreover, the ISD1420 voice chip in the system also has a voice input function, and the user can input (multiple times) the language style, form and content of the voice report by himself through a micro MIC in the system. The workflow is shown in Figure 6 , Figure 7, Figure 8, Figure 9 shown.

The utility model can be effectively used for home distance measurement, short-distance building distance measurement, indoor length, width and area measurement, as well as field investigation distance measurement and mine detection, etc., and is especially suitable for similar places where there are pollution sources and radiation sources. If it is properly improved, it can also be used in parking lots and anti-collision warning systems. Due to consideration of the inevitable radiation and interference between the various components of the system and the outside world, the design accuracy of the system is set within 10 meters and the error is 0.05 meters, that is, the error range is ±0.5%. Within a certain distance, its accuracy can fully meet the requirements of working in the above environment.

The applicant should point out that all components of the present application are commercially available products, and the contribution of the utility model is that they are assembled into a new portable household rangefinder through scientific combination, which is not only easy to use, but also accurate in distance measurement, The effect is good. Therefore, any technical solution that is essentially the same as the technical solution of the utility model made by equivalent replacement or equivalent means belongs to the protection scope of the utility model.

The working situation of the present utility model is that the ultrasonic transceiver transmits ultrasonic waves to the direction of the measured target, starts timing at the same time as the transmitting time, the ultrasonic waves propagate in the air, and return immediately when encountering an obstacle (target) on the way, and the ultrasonic receiver collects When the reflected wave is reached, stop timing immediately. According to the time t recorded by the timer, the propagation speed of ultrasonic waves in the air is:

$V=331.4\sqrt{\frac{T}{273.16}+1},$ The distance (S) between the launch point and the obstacle can be calculated, namely: $S=331.4\·t\sqrt{\frac{T}{273.16}+1}/2.$

In practice, the ultrasonic transmitter and receiver are assembled together, collectively called the sensor. The sensor emits a 40kHZ ultrasonic wave, and the microcontroller starts timing at the same time; the ultrasonic wave hits the object to be measured and reflects back, the sensor receives the echo and sends it to the microcontroller, and the microcontroller stops timing. The time counted by the single-chip microcomputer is the round-trip time of the ultrasonic wave from the sensor to the measured object. Multiply it by the speed of the ultrasonic wave in the air, and divide it by 2 to get the distance to be measured. After the single-chip microcomputer starts timing, as long as the sensor receives the echo, the single-chip microcomputer stops timing, that is, only the first returned ultrasonic wave will work, that is to say, the instrument always measures the distance of the object closest to the sensor. This is the so-called time difference ranging method, and the flow chart of the ultrasonic emission processing program is shown in Figure 9.

Single-chip microcomputer (AT89C2051): Responsible for issuing instructions of the entire system, data transmission, processing and storage, and reasonably arranging the working order of other functional modules through interrupt commands.

In the power-on state, the single-chip microcomputer AT89C2051 controls the ultrasonic transmission through an external interrupt command. What the receiver receives is not the diffracted wave, but the reflected wave of the obstacle target), and then the internal timing starts, and the target distance to be measured can be calculated through the physical relationship between time and distance.

LED digital tubes are used to display the values of meters, decimeters and centimeters respectively, with a decimal point in the middle. Set the LED digital tubes to alternate dynamic display. Although only one digital tube is on at a time, but because the scanning frequency is very high, it looks as if all the digital tubes are on at the same time. Generally, it is enough to scan once in 20ms, that is, the frequency of flickering change is 50HZ, which can fully meet the requirements of human vision persistence.

After the single-chip microcomputer is equipped with a voice interface, it can realize the voice alarm prompt of multi-channel information, so as to improve the overall level of the system and enhance the alarm effect. In this design, a voice chip is used, and it is equipped with a micro MIC and a loudspeaker. After the system is formed, users can input a certain style of prompt voice in advance according to their own preferences. For example, the pronunciation of the ten numbers "measured distance is", "point", "meter", "0"-"9" can be input in advance. After the system measures the distance to the target, and then displays it through the LED, it will output the prompt voice, such as "the measured distance is a certain point and a certain meter". Among them, the Chinese characters are in fixed format, while the numbers are the actual measured values.

In the measurement environment, the ultrasonic propagation speed can be expressed as:

Among them, r is the specific heat value of the gas, R is the gas constant, T is the thermodynamic temperature, μ is the molecular weight of the gas. It can be seen from the publicity (1) that the sound velocity is proportional to the square root of the thermodynamic temperature, and the higher the temperature, the greater the sound velocity. Experiments show that the practical empirical formula for temperature value is: $V=331.4\sqrt{\frac{T}{273.16}+1}---\left(2\right)$

For the T value, it can be collected by a temperature sensor and sent to the single chip microcomputer for calculation.

In the main program flow shown in Figure 8, the button S2 in the circuit diagram is a reset switch, which is connected to the RST reset signal pin of the AT89C2051 microcontroller. The reset of the single-chip microcomputer is realized by the external circuit (power supply). After the clock circuit works, as long as the high level of 24 clock oscillation pulses (2 machine cycles) appears on the RST pin of the single-chip microcomputer, the single-chip microcomputer can be realized. The initialization state is reset. In order to ensure the reliable reset of the application system, when designing the reset circuit, the RST pin is usually kept at a high level for more than 10ms. As long as RST remains high, the microcontroller will reset in a loop; when RST changes from high to low, the microcontroller will start executing the program from address 0000H. During the effective period of microcontroller reset, ALE and PSEN are reversed, and the pin outputs high level. After reset, the state of each register of the microcontroller is basically in the cleared state, that is, the registers PC, Acc, B, PSW, DPTR, etc. are all in the 00H state, and the SP is in the 07H state. Button S2 is the system power switch

Detect the state of button S1: After S2 starts, after a small delay, after the system reaches stability, set the timer, and at the same time, emit ultrasonic waves and time. Button S1 is the ranging button

Immediately after the echo is received, an interrupt is generated and data processing begins. Send the processing results to the LED display, and then report the measurement results driven by ISD1420.

Before the measurement, the submitted voice can be entered by the MIC according to the needs, such as: "measurement distance is", "0-9" 10 numbers, "point", "meter" and so on. After the result is measured, the language report function will report another report: "The measured distance is a certain point and a certain meter".

The recording function is generally used at the beginning, and users can set the form of voice prompts according to their own needs or hobbies. In this way, once the product is formed, the same system will not have stereotyped voice prompt information. In the design, we input "measurement distance is", "0-9", 10 numbers, "point", "meter" in Mandarin and other characters. Among them, in the program design, the "measurement distance is" is entered separately in 2 seconds, while the other 12 characters are controlled by loop statements, each taking 0.5 seconds.

Compared with the prior art, the utility model has the following prominent features:

1. The utility model has high precision and accurate test. The temperature recognizer is combined with the controller to adjust the ultrasonic speed of the system chip operation according to the real-time temperature compensation. The error is controlled within 5 cm within the range of 10 meters, and the measurement accuracy can even reach industrial requirements.

2. Easy to use, including the power supply (5V), the size of the entire instrument can be controlled within the volume range of 10cm*6cm*5cm, and it can be easily operated with one hand, just press the power switch and the distance measurement button successively It can complete all the work, and the measurement accuracy can meet various daily use occasions, suitable for home decoration, indoor planning, and for intelligent voice robots, reversing radar, construction sites and some industrial sites, such as: liquid level, well depth, pipelines, etc. occasion. In particular, the rangefinder is suitable for distance measurement of similar places in the presence of pollution sources and radiation sources.

3. The chip used in the system circuit is relatively cheap, the production cost is low, and it is easy to maintain.

4. In addition to using the LED module to display the results, the utility model also successfully introduces the recording and playback function of the ISP1420 into the design of the instrument, so that the system has the function of displaying the measurement results in numbers and voices, and can also be used according to customer needs. Or the user can change the content and form of the prompt voice according to their actual needs. It has a good human-machine interface and is suitable for unconventional environments (such as strong light exposure environments, dark environments) and special groups (such as visually impaired people, hearing aids, etc.) handicapped) use, is an innovation on household and portable ranging equipment, and has significant economic and social benefits.

Claims (8)

1. A portable intelligent rangefinder with voice function, including a housing and a distance measuring circuit in the housing, characterized in that the front of the housing (1) has a display window (2), a power switch (3), a measuring The distance switch (4) and the temperature recognizer socket (6), the temperature recognizer socket (6) is equipped with a temperature recognizer (5) connected to the controller, the distance measuring circuit includes a power supply, a controller, a power supply and a control The controller is connected with the ultrasonic transceiver, trigger, decoder and distance measuring switch (4), the power supply is connected with the power switch (3), voice chip, loudspeaker, decoder and digital display, and the trigger It is connected with the voice chip, the voice chip is connected with the microphone and the loudspeaker respectively, and the decoder is connected with the digital display. 2. The portable intelligent distance measuring instrument with voice function according to claim 1, characterized in that, its structure of the distance measuring circuit is that 1 pin of the controller IC1 is connected to the second key switch S2 through the resistance R1, and the second key switch S2 is Two key switch S2 is connected to power supply VCC, capacitor C3, resistor R3, resistor R3 is grounded through series diode LED1, capacitor C3 is grounded through series resistor R2; pin 2 of controller IC1 is connected to resistor R27 and speaker YS3, pin 4 of IC1, The 5 pins are respectively connected to the two ends of the ceramic oscillator JZ, and are grounded through the capacitor C1 and the capacitor C2. The 6 pins of the controller IC1 are grounded through the first key switch S1 and the resistor, and the 7 pins of the controller IC1 are connected to the resistors R20, R21, and capacitors. C9, collector of diode NPN4, pin 8 and pin 9 of controller IC1 are connected to trigger IC2, pin 10 of controller IC1 is grounded, pin 20 of controller IC1 is connected to power supply VCC, pins 12-19 of controller IC1 are connected to the cable Wire trigger IC2, the trigger IC2 is connected to the voice chip IC4, the 2 pins of the voice chip IC4 are grounded, the 14 pins and 15 pins of the voice chip IC4 are connected to the first sounder YS1, the 16 pins of the voice chip IC4 are connected to the power supply VCC, and Ground via resistor R8 and capacitor C5, pin 17 of the voice chip IC4 is connected to resistor R9, microphone MIC via capacitor C7, microphone is grounded, resistor R9 is connected to resistor R8 and capacitor C5, pin 18 of voice chip IC4 is grounded via capacitor C6, pin 19 The capacitor C8 and the resistor R10 connected in parallel are grounded, the capacitor C is installed between pin 20 and pin 21 of the voice chip IC4, the pin 24 of the voice chip IC4 is connected to the resistor R7, the pin 25 is connected to the resistor R6 through the diode LED2, and the resistors R6 and R7 are connected in parallel Connect resistors R4, R5, capacitor C4 and power supply VCC, capacitor C4, resistor R4 and resistor R5 are connected to trigger IC2 and voice chip IC4, pins 3, 4 and 5 of decoder IC3 are connected to power supply VCC, decoder Pins 6, 2, 1, and 7 of IC3 are connected to pins 15, 14, 13, and 12 of controller IC1, and pins 14, 15, 9, 10, and 11 of decoder IC3. Pins 12 and 13 are respectively connected to the display LED through resistors R11-17, and the display LED is connected to the collectors of transistors NPN1 and NPN2, and the emitters of transistors NPN1 and NPN2 are connected to the power supply VCC, resistor R27 and the third speaker YS3, and the transistors NPN1 and NPN2. The base is connected to pin 17 and pin 16 of the controller IC1 via resistors R18 and R19, and resistors R22, R23, R24, R25, R26, and R28 are connected in parallel to resistor R21, resistor R27, the third speaker YS3 and power supply VCC, and resistor R28 is connected to the first Two speakers YS2 and the base of the triode NPN1, the emitter of the triode NPN1 are grounded, the collector of the triode NPN1 is connected to the resistor R28, the capacitor C12, and the capacitor C12 is connected to the resistor R28, the base of the triode NPN2, the emitter of the triode NPN2 is grounded, collector connection resistance R24, capacitor C11, connected to resistor R23, the base of transistor NPN3 through capacitor C11, the emitter of transistor NPN3 is grounded, the collector of transistor NPN3 is connected to resistor R22, capacitor C10, and connected to the base of transistor NPN4 through capacitor C10, the transistor The emitter of NPN4 is grounded. 3. the portable intelligent rangefinder with voice function according to claim 1, is characterized in that, described controller IC1 is AT89C2051 single-chip microcomputer, and trigger IC2 is a 74LS377 trigger chip, and voice chip IC4 is an ISD1420 voice chip, translated The encoder IC3 is a 74LS47 decoder, the digital display is an LED digital tube integrated display block, and the temperature recognizer is a DS18B20 temperature sensing integrated module. 4. The portable intelligent rangefinder with voice function according to claim 1, characterized in that, the housing is square, display window (2), power switch (3), distance measurement switch (4), The temperature identifier socket (6) is installed on the front panel of the housing in sequence from left to right. 5. The portable intelligent rangefinder with voice function according to claim 1, characterized in that, said controller has 2k bytes of EPROM, 128 bytes of RAM, 15 I/O lines, 2 16-bit Timer/counter, and contains precision analog comparator and on-chip oscillator, with 12MHz/24MHz operating frequency, at the same time, there are two 16-bit timer/counter registers Timer0 and Timer1. 6. The portable intelligent rangefinder with voice function according to claim 1, characterized in that, the ultrasonic transceiver adopts the piezoelectric ceramic sensor of the UCM40 matching the transmitting head and the receiving head. 7. The portable intelligent rangefinder with voice function according to claim 1, characterized in that, said digital display adopts LED digital tube display, and the 74LS47 decoder matched with common anode seven-segment digital tube realizes the The four-bit input signal is converted into a seven-bit coded signal, which is displayed by three LED digital tubes, controlled by the controller, and the measurement result value is displayed after the measurement result is obtained. 8. The portable intelligent rangefinder with voice function according to claim 1, wherein the voice chip includes a single-chip voice recording and playback circuit ISD1420 and a microphone and a loudspeaker, and the loudspeaker is controlled by the ISD1420 voice chip and AT89C2051 Connected with the device, while the LED lights up to display the distance, the voice broadcasts the measurement results.

Images