Design of Simulating Fully Automatic Washing Machine Based on Single Chip Microcomputer SPMC75

Washing machines are an indispensable household appliance in family life. Fully automatic washing machines are popular because of their convenience. Fully automatic means that a series of processes such as water filling, washing, rinsing, and drying are completed automatically. The controller of a general washing machine usually has several washing programs for users to choose from for different clothes. Although washing machines with such controllers make the washing process simple and easy to control, they cannot combine washing and energy saving well [1].

This design is based on a simulated washing machine system based on fuzzy control, which makes the laundry system develop in the direction of automation, intelligence, and especially energy saving. It can automatically control the water volume, water temperature, detergent, mechanical force, etc. according to the texture and degree of dirtiness of the washed clothes, so that the washing process is more energy-efficient while the clothes are washed clean.

1. Sunplus microcontroller SPMC75F2413A

SPMC75F2413A is an industrial-grade 16-bit microcontroller chip designed and developed by Sunplus Technology. Its core uses the μ′nSTM (pronounced micro-n-SP) microprocessor with independent intellectual property rights of Sunplus. It integrates functional modules such as multi-function I/O ports, synchronous and asynchronous serial ports, ADC, timer counters, and special hardware modules such as multi-function capture comparison module, BLDC motor drive dedicated position detection interface, two-phase incremental encoder interface, and PWM generator that can generate various motor drive waveforms [2]. These hardware modules support SPMC75F2413A to complete complex applications such as variable frequency drives for household appliances, standard industrial variable frequency drives, variable frequency power supplies, and multi-loop servo drive systems.

2 Fuzzy Control Model of Fully Automatic Washing Machine

Fuzzy control is a new type of computer control method based on fuzzy set theory, fuzzy language variables and fuzzy logic reasoning. Obviously, the basis of fuzzy control is fuzzy mathematics, and the means of realizing fuzzy control is computer.

The basic working process of a fully automatic washing machine includes water intake, washing, rinsing, drainage, and spin drying. After fuzzy control technology is used in a fully automatic washing machine, it can automatically obtain the best washing method based on the detection of the laundry, thereby achieving intelligent and energy-saving effects. This design takes the weight and dirtiness of the laundry as the test objects, and designs a series of washing methods suitable for different clothes. The fuzzy control model of a fully automatic washing machine is shown in Figure 1.

3 Hardware Design

First, the hardware part of the washing machine is modularized, mainly divided into the following modules:

⑴ Detection module: The detection part is mainly realized by various sensors and A/D converters, which are divided into: cloth quantity detection, clothing contamination detection, etc. The detection results of each part are input into the single-chip CPU through the A/D converter for processing and analysis;

⑵Control module: The control part is the key part of the entire intelligent washing machine, and the single-chip microcomputer is responsible for processing. The sensor transmits the detected data information to the controller, where it is analyzed and processed. The CPU compares the obtained data with the standard data to obtain the control results, such as: water addition amount, washing time, motor speed, etc., and outputs the processed results to the actuator action;

⑶ Washing module: The washing part is mainly composed of a motor and various switches. Various washing actions are completed through the CPU-controlled motor forward and reverse rotation, speed and switch closing. Its hardware circuit is shown in Figure 2;

Taking five washing methods as an example, the fuzzy control rule table is shown in Table 2. Among them, 16 clothing detection states are represented by state1~state16; washing intensity {weak, medium, strong} is represented by variables {w, c, s} respectively; time {short, medium, long} is represented by variables {s, m, l} respectively.

(4) Voice module: The voice part is completed by the speaker, which reports the washing progress through the control of the CPU;

⑸ Display module: The display part consists of a group of LED digital displays and 9 groups of light-emitting diodes, which are used to display the washing time and washing process. Its hardware circuit is shown in Figure 3.