饮水机控制系统的设计

饮水机温控系统

摘要

论文采用高性价比的AT89C2051单片机作为核心控制芯片，外围部件由防水数字温度传感器DS18B20，键盘电路，水位探测器，LED显示电路，加热控制器组成。实现了：

(1)能检测饮水机加热体中的水量和水温并能LED数码管显示水温。水量低于设定值时禁止加热;

(2)防止干烧。设定两种加热模式;

(3)温水键可以把水加热到60度，开水键可以把水加热到100度并实时显示水温。管显示水温。水量低于设定值时禁止加热;

(4)系统自动比较水温和系统设定温度，当水温低于设定温度10度时，加热器开始加热，当水温达到设定温度时，加热器停止工作。

饮水机设置温水键、开水键对水温进行控制。接通电源后，系统检测饮水机加热体中的水量及水温，并将水温清晰地显示在LED数码显示器上。为防低于系统设置，系统处于待机状态，此时温水键和开水键无效，待用户加足水后按键功能有效。

本设计中的数字温度传感器采用DS18B20。键盘电路由温水键、开水键2个独立式按钮组成。显示电路由4位七段码LED显示器组成。水深探测器为一根金属棒。加热控制器为MOTOROLA公司生产的单片集成光电耦合可控硅驱动器件MOC3041。

关键字温度/控制/单片机/传感器

DESIGN OF TEMPERATURE CONTROL

SYSTEM OF DRINKING MACHINE

ABSTRACT

In this thesis, cost-effective AT89C2051 MCU as a core control chip, the external parts of the waterproof digital temperature sensor DS18B20, keyboard circuit, water level detector, LED show circuit, the heating controller. Achieved: 1. Can detect water fountains and water temperature and water temperature can be used LED digital display. 2. The prohibition of water below the set value of heating, to prevent dry. 3. To set two heating mode, warm water key to the water heated to 60 degrees, water key to the water heated to 100 degrees and display the water temperature. 4. Comparison of water temperature and the system automatically set the temperature, when the water temperature 10 degrees below the set temperature, the heater began to heat, when water temperature reaches the set temperature, the heater stopped working.

There are two buttons on drinking water temperature control. When powered on,temperature clearly displayed on the LED digital display. To prevent dry damagedheater, heating system uses water level detector to monitor the water level in the body,if the water is lower than the setting, the system is in standby mode, the cursor keysand warm water key is invalid, when the user to add a little water to key functioneffectively.

In this design's digit temperature sensor is DS18B20. Key keyboard circuitconsists of warm water, water stand-button key component 2. Display circuit consistsof four seven segment LED display composition. During the heating controller is themonolithic integrated electro-optic coupling silicon-controlled rectifier whichMOTOROLA Corporation produces actuates MOC3041.

KEY WORDS temperature,control,SCM,sensor

目录

中文摘要 .................................................................................................. . (Ⅰ)

英文摘要 ................................................................................................... (Ⅱ)

1 引言 (1)

1.1课题的目的及意义 (1)

1.2 国内外发展现状及研究概况 (1)

1.3设计的主要技术指标与参数 (2)

1.4设计的主要内容 (2)

2 设计要求的分析和方案的确定 (3)

2.1设计要求分析 (3)

2.2 方案的确定 (4)

3 总体电路的设计 (5)

3.1电路组成及工作原理 (5)

3.1.1电路的组成 (5)

3.1.2电路系统框图 (6)

3.2单元电路的设计与元件选择 (7)

3.2.1主控制单元的设计 (7)

3.2.2温度传感系统的设计 (10)

3.2.3加热控制系统的设计 (13)

3.2.4水位探测系统的设计 (15)

3.2.5显示电路及键盘电路的设计 (17)

3.3整体电路图 (23)