CN211824754U - Thermometer with LED for indicating body temperature - Google Patents

Abstract

The utility model discloses a thermometer for indicating body temperature by LED, which comprises a thermometer body. There are LED light groups of different colors on the area, and the end of the thermometer body is provided with an infrared temperature measurement sensor. The LED light group, the infrared temperature measurement sensor, and the MCU in the thermometer body are electrically connected; imitating the shape of a mercury thermometer, using LED lights Indicate the temperature, obtain the human body temperature signal through the infrared temperature measurement sensor, the human body temperature signal is converted into the LED light driving signal through the MCU, and the corresponding color light is driven to light up, each LED light represents 0.1 degrees, and different colors are used to indicate the temperature. To judge whether the color is normal or not, you don't need to consider the backlight problem, and it is powered by a AA battery that is easy to buy. The pen-shaped design is easy to carry.

Description

A thermometer with LED indicating body temperature

technical field

The utility model relates to the technical field of thermometers, in particular to a thermometer with LED indicating body temperature.

Background technique

At present, the indications used in electronic body temperature measurement are LED indication screens or LCD indication screens, which are large in size and cannot be carried. LED strip indications are used to avoid customization of LCD and LED digital tubes. The delivery time is long, the cost is high, and the temperature measurement accuracy is low.

Utility model content

The purpose of this utility model is to provide a thermometer and its LED body temperature indication circuit to solve the problems raised in the above background technology.

In order to achieve the above purpose, the present invention provides the following technical solutions: a thermometer with LED indicating body temperature, comprising a thermometer body, the thermometer body is provided with a temperature scale line along its length direction, and a plurality of temperature scale lines are arranged on one side of the temperature scale line. Each indicator area is provided with LED light groups of different colors. The end of the thermometer body is provided with an infrared temperature sensor for obtaining human body temperature signals through infrared technology. The LED light group, infrared temperature sensor, and The MCU in the thermometer body is electrically connected.

Preferably, the MCU has a built-in LED body temperature indication circuit, a signal amplification circuit, a battery power supply circuit and an LED array drive circuit, the LED body temperature indication circuit is built in the MCU, and the infrared temperature measurement sensor uses analog electrical signals and signals The input interface of the amplifying circuit is electrically connected, the output end of the signal amplifying circuit is electrically connected with the input and output interfaces of the MCU, the MCU is electrically connected with the LED array drive circuit through a four-wire control signal, and the LED array drive circuit is electrically connected through the Twenty-seven driving signals are electrically connected to the LED light group, and the battery power supply circuit supplies power to the infrared temperature measuring sensor, the signal amplification circuit, the MCU and the LED array driving circuit respectively.

Preferably, the MCU is electrically connected to the temperature measurement switch button, and the input end of the temperature measurement switch button is electrically connected to the output end of the infrared temperature measurement sensor.

Preferably, the LED light group is composed of LED temperature indicator lights, and the LED temperature indicator lights include red indicator light beads, green indicator light beads, and yellow indicator light beads. There are 10 LED temperature indicators respectively.

Preferably, the infrared temperature measurement sensor is connected to a thermal resistance to maintain a stable temperature.

Compared with the prior art, the beneficial effects of the present utility model are:

The utility model directly judges whether the body temperature is normal by responding to the change of the color indicated by the LED temperature indicator light, without considering the backlight problem, and adopts a conventional pen-shaped design, which is convenient to carry, easy to produce and low in cost.

Description of drawings

Fig. 1 is the circuit principle block diagram of the utility model;

Fig. 2 is the structural representation of the utility model;

Fig. 3 is the wiring diagram of the LED temperature indicator light of the utility model;

Fig. 4 is the enlarged view of A part of Fig. 3;

Fig. 5 is the enlarged view of B part of Fig. 3;

Fig. 6 is the C part enlarged view of Fig. 3;

Fig. 7 is the enlarged view of D part of Fig. 3;

FIG. 8 is an enlarged view of the E part of FIG. 3;

FIG. 9 is an enlarged view of the F part of FIG. 3;

Fig. 10 is the circuit diagram of the utility model MCU;

11 is a circuit diagram of an LED array drive circuit of the present invention;

Fig. 12 is the circuit diagram of the booster circuit of the utility model;

Fig. 13 is the circuit diagram of the 3.3V voltage regulator circuit of the utility model;

Fig. 14 is the circuit diagram of the 1.2V voltage regulator circuit of the utility model;

Fig. 15 is the circuit diagram of the temperature measuring sensor of the utility model;

Fig. 16 is the circuit diagram of the buzzer of the utility model;

17 is a circuit diagram of the utility model program burn entry;

18 is a circuit diagram of a power supply voltage detection circuit of the present invention;

Fig. 19 is the circuit diagram of the utility model temperature measurement switch button;

FIG. 20 is a circuit diagram of the utility model setting a switch button.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

The same or similar components are identified by the same reference numerals in different drawings; please also understand that text such as "first", "second", "third", "upper", "lower", "front", "rear" , "inner", "outer", "end", "portion", "section", "width", "thickness", "area", etc. and similar terms are provided for convenience only by the reader with reference to the It is only to help describe the present invention, and is not intended to limit the present invention.

Please refer to FIGS. 1-20, the present utility model provides a technical solution: a thermometer for LED body temperature indication, including an LED body temperature indication circuit and a thermometer body, the LED body temperature indication circuit is arranged inside the thermometer body, and the thermometer body There is a temperature scale line corresponding to the LED temperature indicator, including a temperature measurement sensor and a battery power supply circuit. The temperature measurement sensor is electrically connected to the input interface of the signal amplification circuit through an analog electrical signal, and the output of the signal amplification circuit is electrically connected. The terminal is electrically connected to the input and output interfaces of the MCU, the MCU is electrically connected to the LED array drive circuit through a four-wire control signal, and the LED array drive circuit is electrically connected to the LED temperature indicator through twenty-seven drive signals. The battery power supply circuit supplies power to the temperature measurement sensor, the signal amplification circuit, the MCU and the LED array drive circuit respectively. The temperature measurement sensor is an infrared temperature measurement sensor, which contains an ambient temperature compensation circuit, and the temperature measurement sensor is provided with a thermal resistance. Reduce the number of infrared rays entering), while maintaining a stable temperature;

The LED temperature indicator is provided with red, green and yellow, and each color of the LED temperature indicator is provided with 24

The top and bottom of the middle section of the main body of the thermometer are respectively provided with a temperature measurement switch button and a setting switch button, which can measure and set the temperature;

Among them, the model of MCU is NSS51FB9A, and the model of LED array drive circuit is TM1621;

The MCU is electrically connected to the temperature measurement switch button, the input end of the temperature measurement switch button is electrically connected to the output end of the temperature measurement sensor, the MCU is electrically connected with a program burn inlet, and the MCU is electrically connected to A power supply voltage detection circuit is connected to detect the power of the power supply. The inside of the thermometer body is provided with a buzzer. When it is detected that the power supply is low, the buzzer will issue an alarm;

The battery power supply circuit is electrically connected to the power supply interface of the LED array drive circuit, the MCU and the signal amplifier through a boost circuit and a 3.3V voltage regulator circuit.

The battery power supply circuit is electrically connected to the power supply interface of the temperature measurement sensor through a 1.2V voltage regulator circuit.

Use LED temperature indicators to indicate the temperature, each LED temperature indicator represents 0.1 degrees, the outside of the product is marked with a scale, and use different colors to indicate whether the temperature is normal, and use a readily available AAA battery for power supply, with a pen-shaped design, Easy to carry.

Operation steps of the present utility model:

1. Press the temperature measurement switch button to wake up and enter the test mode;

2. Obtain the thermoelectric signal voltage of the temperature sensor;

3. Obtain the ambient temperature of the temperature sensor;

4. Calculate the temperature of infrared measurement;

5; Compare the temperature results;

6. Push the corresponding LED temperature indicator to prompt;

7. Data storage and readout;

8. Automatic sleep after 10 seconds delay.

The utility model imitates the shape of a mercury thermometer, uses LED lights to indicate the temperature, and displays it in the form of different numbers and different colors of LED lights, which can be used for temperature detection under the armpit or the mouth of the ear, and obtains the body temperature signal through an infrared temperature sensor. The human body temperature signal is converted into the LED light driving signal through the MCU, and the corresponding color light is driven to light up, and each LED light represents 0.1 degrees. When the temperature is 37.4℃～38℃, the lemon-yellow LED light in the low-grade body temperature area lights up, when the human body temperature is 38.1℃～39℃; the orange-yellow LED light in the moderate fever body temperature area lights up, when the human body temperature is 39.1℃～41℃, The red LED light in the area with high fever and body temperature lights up, and uses different colors to indicate the temperature. The LED indication is intuitive, and the color is normal to judge whether the color is normal or not. It does not need to consider the backlight problem.

Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes and modifications can be made to these embodiments without departing from the principles and spirit of the present invention , alternatives and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (5)

1. a thermometer for LED indication body temperature, comprising a thermometer body, and the thermometer body is provided with a temperature scale line along its length direction, it is characterized in that: a number of indicator light areas are provided on one side of the temperature scale line, different indications. The lamp area is provided with LED light groups of different colors, the end of the thermometer body is provided with an infrared temperature measurement sensor, and the LED light group, the infrared temperature measurement sensor, and the MCU in the thermometer body are electrically connected. 2 . The thermometer with LED indicating body temperature according to claim 1 , wherein the MCU has built-in LED body temperature indicating circuit, signal amplifying circuit, battery power supply circuit and LED array driving circuit, and the LED body temperature indicates 2 . The circuit is built in the MCU, the infrared temperature sensor is electrically connected with the input interface of the signal amplification circuit through an analog electrical signal, the output end of the signal amplification circuit is electrically connected with the input and output interfaces of the MCU, and the MCU is electrically connected through a four-wire The control signal is electrically connected to the LED array drive circuit, the LED array drive circuit is electrically connected to the LED light group through twenty-seven drive signals, and the battery power circuit supplies the infrared temperature sensor, the signal amplifier circuit, the MCU and the LED array respectively. Power supply for the drive circuit. 3. A thermometer with LED indicating body temperature according to claim 1, characterized in that: the MCU is electrically connected to the temperature measurement switch button, and the input end of the temperature measurement switch button is connected to the infrared temperature measurement sensor. The output terminal is electrically connected. 4 . The thermometer with LED indicating body temperature according to claim 1 , wherein the LED light group is composed of LED temperature indicator lights, and the LED temperature indicator lights include red indicator lamp beads and green indicator lights. 5 . There are three types of lamp beads and yellow indicator light beads, and 10 LED temperature indicators of each color are provided. 5 . The thermometer with LED indicating body temperature according to claim 1 , wherein the infrared temperature measuring sensor is connected to a thermal resistance to maintain a stable temperature. 6 .

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