食物营养含量检测系统设计

Design of food nutrition content detection system

以单片机作为控制器,与称重传感检测电路、A/D转换采集电路、按键输入电路、LCD显示输出电路和串口通信构成检测系统。经过称重感应、检测放大、A/D采集转换后,数字信号经串口传送至上位机,拟合出检测系统的特性曲线。单片机再以此进行数据处理得到被测食物的重量与营养值,并在LCD上显示。结果表明:设计简单方便、称量准确,能够满足不同个体的营养需求。

The detection system is composed of single chip microcomputer（SCM） which is used as controller, weight sensing detecting circuit,analog to digital（A/D） conversion acquisition circuit,key input circuit,liquid crystal display（LCD） output circuit and serial communication. After weighing,sensing,detecting,amplifying,A/D collecting and converting,the datasets acquired from the detection system are transmitted to upper PC via serial port,and the characteristic curve of the detection system is fitted by PC computing the datasets. The nutrition value of the tested food is calculated and displayed on the LCD according to the characteristic parameters. The result shows that the design is simple and accurate,and can meet the nutrition demands of different individuals.