Design of Range Hood Control System Based on MSP430

Range hoods are an essential kitchen appliance in modern family life. In addition to the functions of a conventional range hood, the new generation of range hoods should also have windshield control, LED low-power lighting and safety alarms. For the manufacturer, the control of production cost is very strict. Therefore, in addition to the more extensive improvements in function, it should also pay attention to controlling the cost, in order to produce a more cost-effective product and gain market advantage. Here, according to the development requirements of a range hood manufacturer, a product control plan is proposed.

1 system overall design range hood consists of fan system, control system and so on. When the motor switch is turned on, the motor drives the spiral disk, and according to the upward movement of the spiral disk cutting air, a low air pressure state appears below the air, so the air is continuously drawn away. The control system is composed of a main control board and a keyboard display board. The main control board adopts MSP430F2121 as the main control chip, which includes the control unit, detection circuit unit and relay unit. The main control chip judges the user's command by detecting the keyboard button, and then controls the corresponding relay action. At the same time, the main control chip can acquire the state of the detection circuit and control the operation of the alarm circuit in real time.

In the working state, the user issues commands such as switch and speed setting through the keyboard, and the main control chip determines or closes the corresponding relay through the logic program judgment to achieve the purpose of switching the speed range of the fan motor, and displays the current speed. On the LED digital tube. The detection circuit is composed of a temperature sensing circuit and a combustible gas sensing circuit, and monitors the on-site temperature and the concentration of the combustible gas respectively. If it reaches the set value, it can issue an alarm and other action commands. The overall design of the system is as shown.

Figure

Hand Knob

Hand Knob


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