Automação da medição e controle dos níveis de pH e cloro da água usando sistema embarcado

Abstract

This work initially provides an explanation of the processes in an ETA (Water Treatment Station), dealing with their importance individually, emphasizing the processes that involve the control of chlorine and pH values. It then deals with elements that are present in a water treatment plant to carry out its processes, they are the TW-54 analyzer and the CONCEPT Plus magnetic dosing pump. Bearing in mind these equipments and their uses, a system was developed that allows for the automation of injection control quantities of substances that change the chlorine concentration and pH of the water, using the NodeMCU Lua ESP-12E board to perform the intelligent part of the process. Also, devices were proposed to be able to perform interaction between the members of the system, these being the MAX485ESA, which allows communication between the TW-54 analyzer and the NodeMCU Lua ESP-12E board, the OMRON G3MB-202P solid state relay, which allows the command signal sent by the board to be able to control the CONCEPT Plus magnetic metering pump, and to protect it against overcurrents, the 1.6 A 250 V ceramic fuse of the Simon 31 series. need for communication between NodeMCU and analyzer, it was discussed about the modbus communication protocol, used in this communication, and about the physical standards of this communication. Finally, the simulation was performed using the Modbus Slave Simulator, which allows simulating the registers of the TW-54 analyzer, simulating it, and a circuit that allowed observing the commands that would be sent to metering pumps by changing the value in the registers of the simulator.