Diseño y construcción de un lavador automático para barriles de cerveza de tipo A de 20L, 30L y 50L utilizando un microcontrolador STM32NúcleoF446RE.

Abstract

This degree work shows the design and construction of a prototype of an automatic keg washer for craft beer kegs "Keg", using the STM32nucleoF446RE development board. The prototype design is divided into two parts, hardware design and software design. The hardware design includes the sizing of actuators such as valves, pump and water heater, sensors and power supplies, as well as the design of the physical structure of the prototype and the control board. The software design includes the design of the barrel washing program, the design of the HMI screen, which was done on a Nextion screen, and the communication between the STM32 board and the Nextion screen. The paper also shows performance tests of the prototype, ranging from individual tests to comprehensive washdown tests. The individual tests detail the behavior of the actuators and sensors, and also show tests of the temperature control by hysteresis with and without perturbations, using measurements from two temperature sensors. For the perturbations, a circulation of the liquid inside the barrel is carried out with the help of the installed pump. Washing tests are carried out in stages on 20-, 30- and 50-liter barrels and time measurements are taken and then compared with the programmed times. Finally, comprehensive washing tests are carried out using a semi-transparent barrel and evidence of the internal cleaning of the barrels is obtained, which are detailed by means of photographs.