37-Design of intelligent temperature control fan based on 51 single chip microcomputer

Specific implementation functions

The system consists of STC89C52 microcontroller + DS18B20 temperature sensor + digital tube + fan + button + power supply.

Specific functions:

1. Use DS18B20 temperature sensor to measure temperature and use digital tube to display in real time;

2. You can manually set the upper and lower limits of the temperature; there are 3 buttons in total: set button, plus button, minus button;

3. When the temperature is lower than the lower limit, the fan will not rotate. When the temperature is between the upper and lower limits, the fan will rotate at 50%. When the temperature is higher than the upper limit, the fan will rotate at full speed.

design background

In recent years, with the rapid development of the air-conditioning industry, the price of air-conditioning has "dived" significantly, and the electric fan industry has been generally considered a "sunset industry". In fact, this is not the case. Market insiders said that household electric fans have not faded out of the market with the popularization of air-conditioning. On the contrary, there has been a trend of market recovery in the past two years. The main reasons are: first, the cooling effect of fans and air-conditioning is different; (air-conditioning has a powerful cooling function and can quickly and effectively reduce the ambient temperature, but the wind of electric fans is gentler and more suitable for the elderly, children and people with weak constitutions.) Second, electric fans have price advantages. They are cheap and relatively energy-saving, and are very simple to install and use.

Traditional electric fans are mostly controlled mechanically, with few functions, high noise, and large wind speed changes. With the development of science and technology and the improvement of people's living standards, household electrical appliances tend to be automated, intelligent, environmentally friendly and humanized, making the emergence of intelligent electric fans controlled by microcomputers possible.

hardware design

This article introduces the design of an intelligent electric fan speed regulator based on STC89C52 single-chip microcomputer. This design cleverly uses infrared remote control technology, single-chip microcomputer control technology, stepless speed regulation technology and temperature sensor technology, and applies intelligent control technology to the control of household appliances. The motor speed of the electric fan is used as the controlled quantity, and the digital temperature signal collected by the single-chip microcomputer is analyzed, and the fan motor is adjusted through the thyristor. Thus, the wind speed can be automatically adjusted without human control.

Schematic

The schematic diagram of this system was designed using Altium Designer19, as shown in the figure.

program

This design uses KEIL5 software to implement program design, as shown in the figure.

Simulation Implementation

This design uses protues8.7 software to implement simulation design, as shown in the figure.