CN202511938U

CN202511938U - Led digital barometer

Info

Publication number: CN202511938U
Application number: CN2012200940244U
Authority: CN
Inventors: 李超
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-03-14
Filing date: 2012-03-14
Publication date: 2012-10-31
Anticipated expiration: 2022-03-14

Abstract

The utility model provides an LED digital barometer, comprising an air pressure sensing module, a V/F conversion module, a main control module and an LED display module. The LED digital barometer is characterized in that the air pressure sensing module, the V/F conversion module, the main control module and the LED display module are connected in orderly, the air pressure sensing module is used to convert a tested air pressure into a voltage signal, and the V/F conversion module is used to convert the voltage signal outputted by the air pressure sensing module into a pulse signal having a certain frequency to thereby be convenient for the main control module to receive the pulse signal; and then the main control module computes the corresponding air pressure value according to the pulse number obtained within a unit time and the linear relationship of the voltage and the frequency, and finally, the LED display module displays the air pressure value under the control of the main control module.

Description

The LED digital altimeter

Technical field

The utility model relates to a kind of barometer, especially the LED digital altimeter.

Background technology

Barometer is widely used in national defence field, industrial circle, medical field and the daily life.Barometrical quality depends primarily on sensor, and the error that causes of environmental change is very considerable to external world for many sensors.

Summary of the invention

In order to improve above problem, it is main control module that the utility model adopts single-chip microcomputer, and selecting the MAX4100A baroceptor for use is main peripheral cell, has measuring accuracy height, simple in structure, reliability advantages of higher.

The utility model provides a kind of LED digital altimeter, comprises air pressure sensing module, V/F modular converter, main control module, LED display module, it is characterized in that: air pressure sensing module, V/F modular converter, main control module, display module connect successively.The air pressure sensing module is used for converting tested air pressure into voltage signal; Then can convert the voltage signal of air pressure sensing module output to pulse signal with the V/F modular converter with certain frequency; So that the main control module receives this pulse signal; And, calculate pairing atmospheric pressure value according to the linear relation of voltage and frequency according to the umber of pulse that obtains in the unit interval, under the main control module controls, show at last by the LED display module.

The beneficial effect of the utility model is, measuring accuracy height, intuitive display, accurately, and advantage such as easy to use and reliable has higher utility.

Description of drawings

Fig. 1 is the theory diagram of the utility model.

Embodiment

In Fig. 1; The utility model provides a kind of LED digital altimeter; Comprise air pressure sensing module 1, V/F modular converter 2, main control module 3, LED display module 4, it is characterized in that: air pressure sensing module 1, V/F modular converter 2, main control module 3, display module 4 connect successively.Air pressure sensing module 1 is used for converting tested air pressure into voltage signal; Can convert the voltage signal of air pressure sensing module 1 output to pulse signal with 2 of V/F modular converters with certain frequency; So that main control module 3 receives this pulse signal; And, calculate pairing atmospheric pressure value according to the linear relation of voltage and frequency according to the umber of pulse that obtains in the unit interval, under 3 controls of main control module, show at last by LED display module 4.

Air pressure sensing module 1 adopts is that the MAX4100A baroceptor of Motorola is measured the absolute pressure value.The temperature compensation range of this sensor is-40～+ 125 ℃; Pressure limit is 20kPa～1050kPa; (Vs=5.0V) scope is 0. 3～4. 65V to output voltage signal; Measuring accuracy is 0. 1 %VFSS, when 20kPa～1050kPa, has simultaneously favorable linearity.V/F modular converter 2 has been selected LM331 voltage/frequency conversion chip for use.This device has used temperature compensation ability gap reference circuit, thereby has splendid temperature stability, and maximum temperature is floated and is 50ppm/ ℃, and the output of the pulse of this device simultaneously can be compatible with any logical form; LM331 can supply power by single, double power supply, and voltage range is 5～40V; Full range 1Hz～100kHz; Maximum nonlinearity erron is 0. 01 %.Main control module 3 has been selected the AT89C2051 single-chip microcomputer of ATMEL for use; This device and 89C51 are compatible, but have the overprogram flash memory of 2kB, the 2. operating voltage range of 7V～6V; The internal RAM of 128Byte and two I/ O (P1; P3), counter/timer and 6 interrupt sources of 2 16, and directly driving LED output has programmable serial communication interface simultaneously.In addition, this single-chip microcomputer also has characteristics such as volume is little, and price is low.LED display module 4 has adopted that 4 LED disjunctors, inner it has 12 pins, contains 7 sections and 4 common ports with its corresponding common anode LED that connects, and is the brightness that improves charactron, can add a transistor drive circuit in the route selection on the throne.

Claims

1. LED digital altimeter; Comprise air pressure sensing module (1), V/F modular converter (2), main control module (3), LED display module (4), it is characterized in that: air pressure sensing module (1), V/F modular converter (2), main control module (3), display module (4) connect successively.