CN102226778A

CN102226778A - Device for detecting grain moisture

Info

Publication number: CN102226778A
Application number: CN2011100882821A
Authority: CN
Inventors: 周文真; 张文昭; 刘正
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-04-10
Filing date: 2011-04-10
Publication date: 2011-10-26

Abstract

The invention relates to a device for detecting grain moisture. The device is characterized in that: the device comprises a plate capacitive sensor (1), an oscillating circuit (2), a single-chip microcomputer (3), a temperature sensor (4), an alarm circuit (5), and a display (6); the plate capacitive sensor (1) and the oscillating circuit (2) compose a frequency generation circuit; the plate capacitive sensor (1) transforms moisture content data into capacitance variation data; the oscillating circuit (2) transforms the capacitance variation data into frequency variation data; the single-chip microcomputer (3) measures the frequency variation data inputted; the display (6) displays the capacitance variation data after the frequency variation data is carried out an internal process by the single-chip microcomputer; the temperature sensor (4) is utilized for detecting a temperature of a grain; and the alarm circuit (5) can give an alarm automatically when a temperature or a moisture content of a grain exceeds a limit value.

Description

A kind of grain moisture pick-up unit

Technical field: this invention relates to fields such as electronic technology, sensing technology and computer technology.

Background technology: grain moisture content is the important assurance of grain transportation, storage and processing, and it directly influences the quality of cereals, and grain moisture content detects cereal is stored and be processed with important meaning.

Summary of the invention: a kind of grain moisture pick-up unit, this device is made up of capacity plate antenna sensor (1), oscillatory circuit (2), single-chip microcomputer (3), temperature sensor (4), warning circuit (5), display (6); Capacity plate antenna sensor (1) and oscillatory circuit (2) component frequency produce circuit, grain moisture content converts electric capacitance change to by capacity plate antenna sensor (1), electric capacitance change is converted to frequency change by oscillatory circuit (2), the frequency of output is detected by single-chip microcomputer (3), after the single-chip microcomputer inter-process, send display (6) to show the water cut of cereal, temperature sensor (4) is used to detect the temperature of cereal, when the temperature of cereal or water cut surpass limit value, alarm (5) will be reported to the police automatically.

The beneficial effect of this device is to store and a kind of simple in structure, cost low water content detection system of processing design for cereal.

Description of drawings

Fig. 1 block scheme; Fig. 2 capacitor arrangement figure; Fig. 3 schematic diagram

At Fig. 1, among Fig. 2 and Fig. 3, comprise capacity plate antenna sensor (1), oscillatory circuit (2), single-chip microcomputer (3), temperature sensor (4), warning circuit (5), display (6) and storage tank (7).

Capacity plate antenna sensor (1) and oscillatory circuit (2) component frequency produce circuit, grain moisture content converts electric capacitance change to by capacity plate antenna sensor (1), electric capacitance change is converted to frequency change by oscillatory circuit (2), the frequency of oscillatory circuit (2) output is detected by single-chip microcomputer (3), after the single-chip microcomputer inter-process, send display (6) to show the water cut of cereal, temperature sensor (4) is used to detect the temperature of cereal and gives single-chip microcomputer (3) with temperature signal, convert temperature value to by single-chip microcomputer (3), the water cut of cereal and temperature send display (6) to show again, when the water cut of cereal or temperature surpassed limit value, single-chip microcomputer (3) control alarm (5) was reported to the police.

Specific embodiments

In the present embodiment, with two parallel placements of pole plate of capacity plate antenna sensor (1), and form a cuboid storage tank, capacity plate antenna sensor (1) just in time is two right opposites of storage tank (7), and cereal to be measured is put into storage tank and measured.

In the present embodiment, capacity plate antenna sensor (1) and oscillatory circuit (2) are formed 555 oscillatory circuits, are used to produce the digit pulse frequency signal, and when the grain moisture content in the storage tank (7) changed, oscillation frequency went out to change.

In the present embodiment, adopt the signal of single-chip microcomputer (3) receiving frequency signals and temperature sensor, and processing obtains grain moisture content and temperature value, send display (6) to show, when temperature and water cut surpass setting, single-chip microcomputer (3) control alarm (5) is reported to the police, and it is STC12C5406AD that single-chip microcomputer adopts model.

In the present embodiment, temperature sensor (4) adopts digital temperature sensor DS18B20.

In the present embodiment, display (6) adopts the LCD1602 LCD.

In the present embodiment, oscillatory circuit (2), single-chip microcomputer (3), temperature sensor (4), warning circuit (5), display (6) all adopt the power supply of 5V power supply.

Claims

1. grain moisture pick-up unit is characterized in that this device is made up of capacity plate antenna sensor (1), oscillatory circuit (2), single-chip microcomputer (3), temperature sensor (4), warning circuit (5), display (6); Capacity plate antenna sensor (1) and oscillatory circuit (2) component frequency produce circuit, grain moisture content converts electric capacitance change to by capacity plate antenna sensor (1), electric capacitance change is converted to frequency change by oscillatory circuit (2), the frequency of output is detected by single-chip microcomputer (3), after the single-chip microcomputer inter-process, send display (6) to show the water cut of cereal, temperature sensor (4) is used to detect the temperature of cereal, when the temperature of cereal or water cut surpass limit value, alarm (5) will be reported to the police automatically.

2. the described a kind of grain moisture pick-up unit of claim 1 is characterized in that with two parallel placements of pole plate of capacity plate antenna sensor (1) and forms a storage tank that cereal to be measured is put into storage tank and measured.

3. the described a kind of grain moisture pick-up unit of claim 1 is characterized in that capacity plate antenna sensor (1) and oscillatory circuit (2) component frequency produce circuit, are used to produce pulse duration frequency signal.

4. the described a kind of grain moisture pick-up unit of claim 1, it is characterized in that adopting the signal of single-chip microcomputer (3) receiving frequency signals and temperature sensor, and processing obtains grain moisture content and temperature value, send display (6) to show, when water cut and temperature surpassed setting, single-chip microcomputer (3) control alarm (5) was reported to the police.