Sound prompt gradienter

Abstract

The utility model discloses a voice prompt gradienter in the technical field of gradienters, an infrared reflecting plate is arranged in an outer box, a glass tube is arranged on the infrared reflecting plate, alcohol is filled in the glass tube, a bubble is reserved in the glass tube, an infrared detection unit is arranged right above the glass tube, and a voice prompt unit is arranged on the infrared detection unit. The infrared detection unit is respectively connected with the power supply circuit and the state judgment circuit, the state judgment circuit is connected with the sound control prompt circuit, and the power supply circuit is connected with the state judgment circuit through the voltage division circuit. The positions of bubbles are detected through the infrared detection unit, a signal is sent to the state judgment circuit, and the state judgment circuit transmits a result to the sound control prompting circuit to make a sound for prompting. The circuit is simple in structure and low in cost, can be normally used under the condition of insufficient light, does not need to be observed by naked eyes, and judges whether a user is horizontal or not by making a sound prompt.

Description

Technical Field

[0001] This utility model relates to a sound-prompting level in the field of level technology. Background Technology

[0002] During renovation and construction, a level is often used to determine if the object is level by visually observing whether the bubble is centered. However, visually checking for levelness often requires good lighting conditions. Indoors, especially on cloudy or rainy days, the lighting is dim, and judging whether the object is level by visually observing the bubble is prone to errors and insufficient measurement accuracy, leading to rework. Utility Model Content

[0003] The purpose of this invention is to provide a sound-guided level indicator with a simple circuit structure, low cost, and the ability to function normally even in low light conditions. It determines whether the level is correct by emitting a sound prompt.

[0004] To achieve the above objectives, this utility model provides a sound-guided level indicator. An infrared reflector is installed inside the outer box, and a glass tube is installed on the infrared reflector. The glass tube is filled with alcohol and has an air bubble. An infrared detection unit is installed directly above the glass tube. The infrared detection unit is connected to a power supply circuit and a status judgment circuit. The status judgment circuit is connected to a sound-guided prompting circuit. The power supply circuit is connected to the status judgment circuit via a voltage divider circuit.

[0005] Compared with existing technologies, the advantages of this invention lie in that it detects the position of the bubble through an infrared detection unit and sends a signal to a status judgment circuit. The status judgment circuit then transmits the result to a sound-activated prompting circuit to provide an audible prompt. The circuit structure is simple, the cost is low, and it can be used normally even in low light conditions. It eliminates the need for visual inspection, relying instead on audible prompts to determine whether the bubble is level.

[0006] As a further improvement of this utility model, the infrared detection circuit includes a light-emitting diode (LED) VD1, which is positioned directly above the center of the glass tube. Phototransistors Q1 and Q2 are symmetrically arranged on both sides of the LED VD1. The collector of phototransistor Q1 is connected to a power supply circuit and one end of resistor R5. The other end of resistor R5 is connected to the positive terminal of LED VD1. The negative terminal of LED VD1 is connected to the emitter of phototransistor Q2. The emitter of phototransistor Q2 is connected to a state judgment circuit. The collector of phototransistor Q2 is connected to the emitter of phototransistor Q1. The emitter of phototransistor Q1 is connected to the state judgment circuit.

[0007] When the bubble is in the center, the infrared light received by the two phototransistors reflected from the metal plate is equal, and the output of the connection point of phototransistors Q1 and Q2 is high. If the bubble moves to one side, the crescent-shaped bubble acts as a concave lens, and the light beam emitted by the light-emitting diode is refracted at the interface, reducing the infrared light received by the phototransistor on that side. On the other side, since there is no bubble blocking the light, the infrared light received by the phototransistor on that side is not reduced, resulting in a low output at the connection point of phototransistors Q1 and Q2. In this way, different output levels are generated under different states, thereby detecting whether the bubble is in the center.

[0008] As a further improvement of this utility model, the status judgment circuit includes operational amplifiers U1A, U1B, and U1C. Pin 2 of operational amplifier U1A is connected to a voltage divider circuit. Pin 3 of operational amplifier U1A is connected to pin 12 of operational amplifier U1B and the emitter of phototransistor Q1. Pin 4 of operational amplifier U1A is connected to a power supply circuit. Pin 13 of operational amplifier U1B is connected to a voltage divider circuit. Pin 11 of operational amplifier U1B is connected to the emitter of phototransistor Q2. Pin 14 of operational amplifier U1B is connected to the base of transistor Q3 via resistor R8. The emitter of transistor Q3 is connected to pin 1 of operational amplifier U1A and a sound control prompt circuit. The collector of transistor Q3 is connected to the cathode of diode D4, and the anode of diode D4 is connected to the volume control circuit. Pin 9 of op-amp U1C is connected to one end of resistor R6 and the cathode of diode D2. The other end of resistor R6 is connected to the power supply circuit. The anode of diode D2 is connected to one end of resistor R7 and the emitter of phototransistor Q2. The other end of resistor R7 is connected to one end of resistor R9 and pin 10 of op-amp U1C. The other end of resistor R9 is connected to the power supply circuit. Resistor R13 is connected between pins 10 and 8 of op-amp U1C. Pin 8 of op-amp U1C is connected to the volume control circuit.

[0009] When the bubble deviates from the center and approaches Q1 or Q2, the voltage at the connection point between the two is close to zero, resulting in a low output level, which is lower than the threshold voltage at the inverting input terminals of the two op-amps. Both op-amps U1B and U1A output a low level. When the bubble is in the center, the connection point between the two outputs a high level, which is higher than or lower than the threshold voltage at the inverting input terminals of the two op-amps. Op-amp U1B outputs a low level.

[0010] As a further improvement of this utility model, the sound control prompt circuit includes oscillators U2A and U2B. Pins 2 and 6 of oscillator U2A are connected. Pin 6 of oscillator U2A is connected to the positive terminal of diode D4. Pins 4 and 14 of oscillator U2A are connected to the power supply circuit. A resistor R12 is connected between pins 5 and 2 of oscillator U2A. Pin 2 of oscillator U2A is connected to the positive terminal of capacitor C2. The negative terminal of capacitor C2 is connected to pin 7 of oscillator U2A. Pin 3 of oscillator U2A is connected to the emitter of transistor Q3 via resistor R10. Pins 8 and 12 of oscillator U2B are connected to transistor D3 and pin 8 of operational amplifier U1C. Pin 10 of oscillator U2B is connected to pin 5 of oscillator U2A. Pin 9 of oscillator U2B is connected to one end of buzzer BZ1 and one end of resistor R11. The other end of resistor R11 is connected to pin 12 of oscillator U2B and one end of capacitor C3. The other end of capacitor C3 is connected to the other end of buzzer BZ1 and pin 7 of oscillator U2A. The other end of buzzer BZ1 is also connected to the emitter of phototransistor Q2.

[0011] When the two operational amplifiers U1B and U1A output a low level, the oscillator controls the buzzer to emit intermittent pulse sounds; when the operational amplifier outputs a high level, the oscillator controls the buzzer to emit continuous pulse sounds. In this way, it is possible to clearly know whether the object being tested is in a horizontal state.

[0012] As a further improvement of this utility model, the power supply circuit includes a battery B1. The positive terminal of the battery B1 is connected to the positive terminal of the diode D5 via a switch S1. The negative terminal of the diode D5 is connected to the positive terminal of the capacitor C1, the other end of the resistor R9, the other end of the resistor R6, one end of the resistor R1, pin 4 of the operational amplifier U1A, and pin 4 of the oscillator U2A. The negative terminal of the battery B1 is connected to the negative terminal of the capacitor C2. The negative terminal of the capacitor C1 is connected to the positive terminal of the diode D1. The positive terminal of the diode D1 is connected to the emitter of the phototransistor Q2 and the voltage divider circuit. The negative terminal of the diode D1 is connected to the other end of the resistor R1 and the voltage divider circuit.

[0013] In this way, the circuit is supplied with voltage by battery B1, and in order to eliminate the change in photoresistance of the two phototransistors as the battery voltage drops, which would reduce the sensitivity of the level, a 2.5V Zener diode D1 is used to regulate the voltage before outputting it to the detection circuit.

[0014] As a further improvement of this utility model, the voltage divider circuit includes a resistor R2. One end of the resistor R2 is connected to pin 2 of the operational amplifier U1A. The other end of the resistor R2 is connected to the negative terminal of the diode D1 and one end of the resistor R3. The other end of the resistor R3 is connected to one end of the resistor R4 and pin 13 of the operational amplifier U1B. The other end of the resistor R4 is connected to the positive terminal of the diode D1 and pin 11 of the operational amplifier U1A.

[0015] Thus, resistors R2, R3, and R4 form a voltage divider circuit for the power supply. Its two tap voltages are sent to the inverting input terminals of U1B and U1A respectively to determine the three states of the bubble: at the center, offset towards Q1, and offset towards Q2. Attached Figure Description

[0016] Figure 1 This is the circuit diagram of this utility model.

[0017] Figure 2 This is a diagram showing the arrangement of the detection circuit and the glass tube of this utility model.

[0018] Among them, 1 is a phototransistor, 2 is a light-emitting diode, 3 is an infrared reflector, 4 is a bubble, and 5 is a glass tube. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings:

[0020] like Figure 1-2 The illustrated sound-guided level includes an outer box, inside which is an infrared reflector 3. A glass tube 5 is mounted on the infrared reflector 3, and the glass tube 5 is filled with alcohol with an air bubble 4. An infrared detection unit is positioned directly above the glass tube 5. The infrared detection unit is connected to a power supply circuit and a status judgment circuit. The status judgment circuit is connected to a sound-guided prompting circuit, and the power supply circuit is connected to the status judgment circuit via a voltage divider circuit.

[0021] The infrared detection circuit includes a light-emitting diode (LED) VD1, which is positioned directly above the center of the glass tube. Phototransistors Q1 and Q2 are symmetrically arranged on either side of LED VD1. The collector of phototransistor Q1 is connected to a power supply circuit and one end of resistor R5. The other end of resistor R5 is connected to the positive terminal of LED VD1. The negative terminal of LED VD1 is connected to the emitter of phototransistor Q2. The emitter of phototransistor Q2 is connected to a state determination circuit. The collector of phototransistor Q2 is connected to the emitter of phototransistor Q1, and the emitter of phototransistor Q1 is also connected to the state determination circuit.

[0022] The status judgment circuit includes operational amplifiers U1A, U1B, and U1C. Pin 2 of operational amplifier U1A is connected to a voltage divider circuit. Pin 3 of operational amplifier U1A is connected to pin 12 of operational amplifier U1B and the emitter of phototransistor Q1. Pin 4 of operational amplifier U1A is connected to the power supply circuit. Pin 13 of operational amplifier U1B is connected to a voltage divider circuit. Pin 11 of operational amplifier U1B is connected to the emitter of phototransistor Q2. Pin 14 of operational amplifier U1B is connected to the base of transistor Q3 via resistor R8. The emitter of transistor Q3 is connected to pin 1 of operational amplifier U1A and the audio prompt circuit. The collector of transistor Q3... Pin 9 of op-amp U1C is connected to one end of resistor R6 and the negative terminal of diode D4. The other end of resistor R6 is connected to the power supply circuit. The positive terminal of diode D2 is connected to one end of resistor R7 and the emitter of phototransistor Q2. The other end of resistor R7 is connected to one end of resistor R9 and pin 10 of op-amp U1C. The other end of resistor R9 is connected to the power supply circuit. Resistor R13 is connected between pin 10 and pin 8 of op-amp U1C. Pin 8 of op-amp U1C is connected to the sound control circuit.

[0023] The tone-controlled prompt circuit includes oscillators U2A and U2B. Pins 2 and 6 of oscillator U2A are connected. Pin 6 of oscillator U2A is connected to the anode of diode D4. Pins 4 and 14 of oscillator U2A are connected to the power supply circuit. Resistor R12 is connected between pins 2 and 5 of oscillator U2A. Pin 2 of oscillator U2A is connected to the anode of capacitor C2. The cathode of capacitor C2 is connected to pin 7 of oscillator U2A. Pin 3 of oscillator U2A is connected to the emitter of transistor Q3 via resistor R10. Pin 8 of oscillator U2B... Pins 1 and 12 are connected to transistor D3 and pin 8 of op-amp U1C. Pin 10 of oscillator U2B is connected to pin 5 of oscillator U2A. Pin 9 of oscillator U2B is connected to one end of buzzer BZ1 and one end of resistor R11. The other end of resistor R11 is connected to pin 12 of oscillator U2B and one end of capacitor C3. The other end of capacitor C3 is connected to the other end of buzzer BZ1 and pin 7 of oscillator U2A. The other end of buzzer BZ1 is also connected to the emitter of phototransistor Q2.

[0024] The power supply circuit includes battery B1. The positive terminal of battery B1 is connected to the positive terminal of diode D5 via switch S1. The negative terminal of diode D5 is connected to the positive terminal of capacitor C1, the other end of resistor R9, the other end of resistor R6, one end of resistor R1, pin 4 of operational amplifier U1A, and pin 4 of oscillator U2A. The negative terminal of battery B1 is connected to the negative terminal of capacitor C2. The negative terminal of capacitor C1 is connected to the positive terminal of diode D1. The positive terminal of diode D1 is connected to the emitter of phototransistor Q2 and the voltage divider circuit. The negative terminal of diode D1 is connected to the other end of resistor R1 and the voltage divider circuit.

[0025] The voltage divider circuit includes resistor R2. One end of resistor R2 is connected to pin 2 of op-amp U1A. The other end of resistor R2 is connected to the cathode of diode D1 and one end of resistor R3. The other end of resistor R3 is connected to one end of resistor R4 and pin 13 of op-amp U1B. The other end of resistor R4 is connected to the anode of diode D1 and pin 11 of op-amp U1A.

[0026] In this invention, a bubble 4 is placed inside the glass tube 5. An infrared light-emitting diode 2 is installed 5 mm above the center of the glass tube 5, and a phototransistor 1 is installed on each side of it. An infrared reflector 3 is placed at the bottom of the glass tube 5. The outer box is opaque and rectangular. The base of the outer box is for measuring levelness, so it should be flat and its length can be appropriately long to achieve higher accuracy in the levelness measurement.

[0027] When bubble 4 is in the center, the infrared light received by the two phototransistors 1 from the infrared reflector 3 is equal. If bubble 4 moves to one side, the light beam emitted by the light-emitting diode 3 is refracted at the interface because the crescent-shaped bubble 4 is equivalent to a concave lens, which reduces the infrared light received by the phototransistor 1 on that side. On the other side, since there is no bubble 4 to block the light, the infrared light received by the phototransistor 1 on that side is not reduced.

[0028] Bubbles exist in three states, as detailed below;

[0029] (1) When the bubble deviates from the center and approaches phototransistor Q1, phototransistor Q2 receives more infrared reflection. The resistance of phototransistor Q2 is very small, and the voltage at the connection point of phototransistor Q1 and phototransistor Q2 is close to zero, which is lower than the threshold voltage of the inverting input terminals of op-amps U1A and U1B. Therefore, both op-amps output a low level. The low level output from pin 1 of op-amp U1A is sent to pin 3 of the oscillator U2A via resistor R10. U2B is a continuous sound oscillator, and its pin 9 output is connected to buzzer BZ1, making it emit a continuous audible sound. Pin 5 of U2A is connected to pin 10 of the reset terminal of U2B. The frequency of U2A is controlled by the control voltage at pin 3. When U1A and U1B output a low level, transistor Q3 is cut off. At the same time, when pin 3 of U2A is low, the voltage control range of capacitor C2 becomes smaller, generating a fast-paced pulse, causing BZ1 to emit an intermittent pulse sound.

[0030] (2) When the bubble moves to the center position, the voltage at the connection point of phototransistor Q1 and phototransistor Q2 increases. When the voltage at pin 12 of U1B exceeds the voltage at pin 13, the output is high. If the output of U1A is still low, then transistor Q3 is turned on and draws all the charging current of U2A. Pin 5 of U2A remains at a high potential, causing BZ1 to emit a continuous sound.

[0031] (3) When the bubble deviates from the center and approaches the phototransistor Q2, the phototransistor Q1 receives more infrared reflected light, the voltage at the connection point of the phototransistor Q1 and the phototransistor Q2 rises to close to 2.5V, the output of U1A becomes high, the transistor Q3 is cut off, and at the same time the high potential of pin 3 of U2A expands the voltage range on capacitor C2, causing BZI to emit a slow-paced intermittent sound.

[0032] Operational amplifier U1C monitors the aging status of battery B1. When the voltage drops to around 6V, the voltage at the non-inverting input is lower than the voltage at the inverting input, and pin 8 outputs a low level, causing U2B to stop working, indicating that the battery needs to be replaced.

[0033] This invention features a simple circuit structure, low cost, and can be used normally even in low light conditions. It uses sound prompts to determine whether the circuit is level, resulting in higher reliability and accuracy in measurement.

[0034] This utility model is not limited to the above embodiments. Based on the technical solutions disclosed herein, those skilled in the art can make some substitutions and modifications to some of the technical features without creative labor, and these substitutions and modifications are all within the protection scope of this utility model.

Claims

1. A sound-guided level indicator, comprising an outer casing, characterized in that: An infrared reflector is installed inside the outer box, and a glass tube is installed on the infrared reflector. The glass tube is filled with alcohol and has one air bubble. An infrared detection unit is installed directly above the glass tube. The infrared detection unit is connected to the power supply circuit and the status judgment circuit. The status judgment circuit is connected to the sound control prompt circuit. The power supply circuit is connected to the status judgment circuit through a voltage divider circuit.

2. The audible level indicator according to claim 1, characterized in that: The infrared detection circuit includes a light-emitting diode (LED) VD1, which is positioned directly above the center of the glass tube. Phototransistors Q1 and Q2 are symmetrically arranged on either side of LED VD1. The collector of phototransistor Q1 is connected to a power supply circuit and one end of resistor R5. The other end of resistor R5 is connected to the positive terminal of LED VD1. The negative terminal of LED VD1 is connected to the emitter of phototransistor Q2. The emitter of phototransistor Q2 is connected to a state determination circuit. The collector of phototransistor Q2 is connected to the emitter of phototransistor Q1, and the emitter of phototransistor Q1 is also connected to the state determination circuit.

3. The audible level indicator according to claim 2, characterized in that: The status judgment circuit includes operational amplifiers U1A, U1B, and U1C. Pin 2 of operational amplifier U1A is connected to a voltage divider circuit. Pin 3 of operational amplifier U1A is connected to pin 12 of operational amplifier U1B and the emitter of phototransistor Q1. Pin 4 of operational amplifier U1A is connected to the power supply circuit. Pin 13 of operational amplifier U1B is connected to a voltage divider circuit. Pin 11 of operational amplifier U1B is connected to the emitter of phototransistor Q2. Pin 14 of operational amplifier U1B is connected to the base of transistor Q3 via resistor R8. The emitter of transistor Q3 is connected to pin 1 of operational amplifier U1A and the audio prompt circuit. The collector of transistor Q3... Pin 9 of op-amp U1C is connected to one end of resistor R6 and the negative terminal of diode D4. The other end of resistor R6 is connected to the power supply circuit. The positive terminal of diode D2 is connected to one end of resistor R7 and the emitter of phototransistor Q2. The other end of resistor R7 is connected to one end of resistor R9 and pin 10 of op-amp U1C. The other end of resistor R9 is connected to the power supply circuit. Resistor R13 is connected between pin 10 and pin 8 of op-amp U1C. Pin 8 of op-amp U1C is connected to the sound control circuit.

4. The audible level indicator according to claim 3, characterized in that: The tone-controlled prompt circuit includes oscillators U2A and U2B. Pins 2 and 6 of oscillator U2A are connected. Pin 6 of oscillator U2A is connected to the anode of diode D4. Pins 4 and 14 of oscillator U2A are connected to the power supply circuit. Resistor R12 is connected between pins 2 and 5 of oscillator U2A. Pin 2 of oscillator U2A is connected to the anode of capacitor C2. The cathode of capacitor C2 is connected to pin 7 of oscillator U2A. Pin 3 of oscillator U2A is connected to the emitter of transistor Q3 via resistor R10. Pin 8 of oscillator U2B... Pins 1 and 12 are connected to transistor D3 and pin 8 of op-amp U1C. Pin 10 of oscillator U2B is connected to pin 5 of oscillator U2A. Pin 9 of oscillator U2B is connected to one end of buzzer BZ1 and one end of resistor R11. The other end of resistor R11 is connected to pin 12 of oscillator U2B and one end of capacitor C3. The other end of capacitor C3 is connected to the other end of buzzer BZ1 and pin 7 of oscillator U2A. The other end of buzzer BZ1 is also connected to the emitter of phototransistor Q2.

5. A sound-guided level according to claim 4, characterized in that: The power supply circuit includes battery B1. The positive terminal of battery B1 is connected to the positive terminal of diode D5 via switch S1. The negative terminal of diode D5 is connected to the positive terminal of capacitor C1, the other end of resistor R9, the other end of resistor R6, one end of resistor R1, pin 4 of operational amplifier U1A, and pin 4 of oscillator U2A. The negative terminal of battery B1 is connected to the negative terminal of capacitor C2. The negative terminal of capacitor C1 is connected to the positive terminal of diode D1. The positive terminal of diode D1 is connected to the emitter of phototransistor Q2 and the voltage divider circuit. The negative terminal of diode D1 is connected to the other end of resistor R1 and the voltage divider circuit.

6. A sound-guided level indicator according to claim 5, characterized in that: The voltage divider circuit includes resistor R2. One end of resistor R2 is connected to pin 2 of op-amp U1A. The other end of resistor R2 is connected to the cathode of diode D1 and one end of resistor R3. The other end of resistor R3 is connected to one end of resistor R4 and pin 13 of op-amp U1B. The other end of resistor R4 is connected to the anode of diode D1 and pin 11 of op-amp U1A.

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