基于近场通讯和物联网的饭堂自动计价系统

发布时间：2019-02-24 11:55

【摘要】：在物联网平台下,设计饭堂自动快速计价系统,提高饭堂的工作效率。提出一种基于近场通讯的DSP数字信号处理的物联网下的饭堂自动计价系统设计方法。进行了系统的总体设计和模块化硬件设计,饭堂自动计价系统主要分为价格信息的发射模块、信息接收模块、信息处理模块和输出模块等,输入信号经过变阻器分压送到TDA8920BTH的输入引脚,TDA8920BTH完成对输入信号的PWM调制、调制波的功率放大输出。采用近场通讯原理设计接收电路,接收电路主要任务是将接收通道、参考通道两路信号经过放大、滤波、阻抗变换等预处理后送入A/D进行采样,低通滤波选用AD公司AD712465,组成二阶低通滤波器,采用BLR(基线恢复器)进行输入信号的倍频均衡处理,完成系统的集成设计。仿真结果表明,采用该系统进行饭堂自动计价控制,具有较好的稳定性和准确性,工作效率较高。
[Abstract]:In the Internet of things platform, design canteen automatic rapid pricing system to improve the efficiency of canteen work. This paper presents a design method of canteen automatic pricing system based on DSP digital signal processing in the Internet of things. The system is designed as a whole and modular hardware. The automatic pricing system is divided into three modules: price information transmitting module, information receiving module, information processing module and output module, etc. The input signal is sent to the input pin of the TDA8920BTH by a variable-rheostat. The TDA8920BTH modulates the input signal by PWM and amplifies the power output of the modulated wave. The receiving circuit is designed by using the principle of near field communication. The main task of the receiving circuit is to send the two signals of the receiving channel and reference channel into A / D after preprocessing, such as amplifying, filtering and impedance transformation. The low pass filter is selected by AD712465, of AD Company. The second order low pass filter is composed and the input signal is equalized by BLR (baseline Restorer) to complete the integrated design of the system. The simulation results show that the system has good stability, accuracy and working efficiency.
【作者单位】：广东工业大学华立学院;
【基金】：2012广东省质量工程人才培养实验区项目(粤教高函[2012]204号) 2015年度广东省大学生创新创业训练计划项目(201513656018)
【分类号】：TH69;TP391.44;TN929.5

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