CN202814580U - Digital thermometer - Google Patents

Abstract

A digital thermometer belongs to the field of computers. The utility model aims to solve the problem that the existing scale reading thermometer has single function and inconvenient reading. The digital thermometer of the utility model includes a main controller, a temperature sensor, an LED display circuit, a single-chip microcomputer reset circuit and a clock oscillation circuit. The temperature signal output end of the temperature sensor is connected with the temperature signal input end of the main controller, and the display of the main controller The command output terminal is connected with the input terminal of the LED display circuit, the reset command output terminal of the microcontroller reset circuit is connected with the reset command input terminal of the main controller, the clock pulse signal output terminal of the clock oscillation circuit is connected with the clock pulse signal input terminal of the main controller connected. The digital thermometer of the utility model is a temperature measurement device used for digital display and upper and lower limit alarms.

Description

Digital Thermometer

technical field

The utility model relates to a digital thermometer and belongs to the field of computers.

Background technique

Thermometers are an important tool for measuring temperature. Most existing thermometers use scales to read temperature data by visual inspection. This method brings a lot of inconvenience to people, such as long reading time and inaccurate readings. Moreover, existing thermometers The function is single, and there are no other additional functions except reading.

Contents of the invention

The purpose of the utility model is to provide a digital thermometer to solve the problem of single function and inconvenient reading of the existing scale reading thermometer.

The digital thermometer of the utility model includes a main controller, a temperature sensor, an LED display circuit, a single-chip microcomputer reset circuit and a clock oscillation circuit, the temperature signal output end of the temperature sensor is connected with the temperature signal input end of the main controller, and the main controller The display command output terminal of the LED display circuit is connected to the input terminal of the LED display circuit, the reset command output terminal of the single-chip microcomputer reset circuit is connected to the reset command input terminal of the main controller, and the clock pulse signal output terminal of the clock oscillation circuit is connected to the clock pulse signal of the main controller. connected to the input.

Advantages of the utility model: the digital thermometer of the utility model has the characteristics of convenient reading, wide range of temperature measurement, and accurate temperature measurement. The output temperature adopts digital display, and is mainly used in places that require relatively accurate temperature measurement, or scientific research laboratories. use. According to people's needs, the upper and lower limits of the temperature alarm value can be set to remind people of temperature changes in time, which brings a lot of convenience.

Description of drawings

Fig. 1 is a schematic structural view of the digital thermometer of the present invention.

Detailed ways

Specific embodiment one: below in conjunction with Fig. 1, illustrate this embodiment, the digital thermometer of this embodiment, it comprises main controller 1, temperature sensor 2, LED display circuit 3, single-chip microcomputer reset circuit 4 and clock oscillation circuit 5, temperature sensor The temperature signal output terminal of 2 is connected with the temperature signal input terminal of main controller 1, the display command output terminal of main controller 1 is connected with the input terminal of LED display circuit 3, and the reset command output terminal of single chip microcomputer reset circuit 4 is connected with the main controller 1 is connected to the reset instruction input end, and the clock pulse signal output end of the clock oscillation circuit 5 is connected to the clock pulse signal input end of the main controller 1 . the

Specific embodiment two: this embodiment is described further to embodiment one, and it also comprises upper and lower limit alarm adjustment circuit 6 and alarm device 7, the alarm parameter output end of upper and lower limit alarm adjustment circuit 6 and the alarm parameter input end of master controller 1 The alarm command output terminal of the main controller 1 is connected with the alarm command input terminal of the alarm device 7 .

The alarm 7 can send an alarm chirping sound when the measured temperature is not within the upper and lower limits, and the LED display circuit 3 will not display the measured temperature value simultaneously. At this time, the upper and lower limits of the alarm can be adjusted by the upper and lower limit alarm adjustment circuit 6, thereby measuring Get the measured temperature value.

Specific implementation mode three: this implementation mode further explains implementation mode two, and the alarm device 7 is realized by using a buzzer.

Embodiment 4: In this embodiment, Embodiment 1, 2 or 3 is further described. The main controller 1 is a single-chip microcomputer whose model is AT89S51.

Embodiment 5: In this embodiment, Embodiment 1, 2, 3 or 4 will be further described. The temperature sensor 2 is a temperature sensor with a model number of DS18B20.

DS18B20 temperature sensor is an improved intelligent temperature sensor newly launched by DALLAS Semiconductor Company in the United States. Compared with traditional temperature measuring elements such as thermistors, it can directly read the measured temperature, and the alarm search command recognizes and marks exceeding the program limit. Temperature Device for temperature alarm conditions.

Embodiment 6: In this embodiment, Embodiment 1, 2, 3, 4 or 5 will be further described. The LED display circuit 3 is realized by using 3-digit common anode LED digital tubes.

Use 3-digit LED digital tube to transmit data through serial port to realize temperature display.

Claims (6)

1. A digital thermometer, characterized in that it includes a main controller (1), a temperature sensor (2), an LED display circuit (3), a microcontroller reset circuit (4), a clock oscillation circuit (5), and a temperature sensor (2) The temperature signal output end of the main controller (1) is connected to the temperature signal input end of the main controller (1), the display instruction output end of the main controller (1) is connected to the input end of the LED display circuit (3), and the reset of the single chip microcomputer reset circuit (4) The instruction output end is connected with the reset instruction input end of the main controller (1), and the clock pulse signal output end of the clock oscillation circuit (5) is connected with the clock pulse signal input end of the main controller (1). 2. The digital thermometer according to claim 1, characterized in that it also includes an upper and lower limit alarm adjustment circuit (6) and an alarm (7), the alarm parameter output terminal of the upper and lower limit alarm adjustment circuit (6) and the main controller The alarm parameter input terminals of (1) are connected, and the alarm command output terminals of the main controller (1) are connected with the alarm command input terminals of the alarm device (7). 3. The digital thermometer according to claim 2, characterized in that the alarm (7) is realized by a buzzer. 4. The digital thermometer according to claim 1 or 2, characterized in that the main controller (1) selects a single-chip microcomputer model AT89S51. 5. The digital thermometer according to claim 1, characterized in that, the temperature sensor (2) is a temperature sensor of model DS18B20. 6. The digital thermometer according to claim 1, characterized in that, the LED display circuit (3) is realized by using a 3-digit common anode LED digital tube.

Images