This paper presents the design and development of a strategy of low-cost automation by the use of a minicomputer Raspberry Pi, to implement web technology in hydraulic processes for edge computing, close to where data is produced. A web page was built to be an user interface, besides, the Ethernet standard has been used to establish the internet connection with the Raspberry board to manipulate the general purpose input/output pins. A program was coded in Python language to both receive signals from the limit switch sensors and control the servo valves through a relay module, because they are actuated by solenoids which require 24 V DC to be excited. The user may start, stop, and home-return the hydraulic process from any device with internet connectivity, thus it can be understood like an implementation of Industry 4.0. The logic sequence for the automation was proved in a simulation software to set a reference performance, then the experimentation, with Raspberry Pi plus the relay module in the manufacturing laboratory, shows successful results of the proposed strategy.

本文介绍了通过使用小型计算机Raspberry Pi来设计和开发低成本自动化策略的方法，该策略是在靠近数据生成位置的液压过程中将Web技术应用于边缘计算。建立了一个网页作为用户界面，此外，以太网标准已用于与Raspberry板建立Internet连接，以操纵通用输入/输出引脚。用Python语言编写的程序既可以接收来自限位开关传感器的信号，又可以通过继电器模块控制伺服阀，因为它们是由需要24 V DC励磁的螺线管驱动的。用户可以从具有互联网连接的任何设备上启动，停止液压过程并向其返回原位，因此可以像工业4.0的实现那样理解。