The resistance value of NTC thermistor will decrease with the increase of temperature. Many manufacturers will take advantage of this feature and use NTC thermistor in household appliances for temperature monitoring, temperature protection and temperature control. With the development of science and technology, air conditioning has become one of the essential household appliances in most families, but ceiling fan is still very common in villages, schools, hospitals and other public places. At present, the speed of ceiling fans on the market are usually controlled by switching. If the person leaves and the ceiling fan is not closed, it will also cause the ceiling fan to rotate all the time, resulting in a waste of resources. In order to realize automatic start and stop of ceiling fan and automatic speed regulation according to room temperature, EXSENSE Electronics introduces an automatic ceiling fan, which uses NTC thermistor to monitor temperature, so as to realize automatic start and close and adjust the speed of ceiling fan, saving resources and being more user-friendly.

The control part of automatic ceiling fan is composed of infrared sensor, single-chip microcomputer, NTC thermistor, stepping motor, ceiling fan gear switch. Among them, the infrared sensor is connected with the input end of the NTC thermistor and the single-chip microcomputer, the stepping motor is connected with the output end of the single-chip microcomputer, and the stepping motor is connected with the gear switch of the ceiling fan. When the automatic ceiling fan works, the infrared sensor will sense whether there is someone in the room and send different signals to the single-chip microcomputer, then it will control the opening and closing of the ceiling fan according to different signals. When there are people in the room, the single-chip microcomputer will determine which gear the ceiling fan should use according to the signal input by the NTC thermistor, and control the stepping motor to drive the ceiling fan gear switch to switch the corresponding gear. When there is no one in the room, the single-chip microcomputer will control the stepping motor to drive the switch of the ceiling fan to "stop" according to the input signal of the infrared sensor, so as to complete the functions of automatic speed regulation and automatic opening and closing of the ceiling fan.

Automatic ceiling fans use infrared sensors to sense whether someone in the room to control the start and stop of the ceiling fan. After the ceiling fan is started, the single-chip microcomputer judges the indoor temperature according to the input signal of the NTC thermistor and controls the stepper motor to drive the switch to adjust the speed of the ceiling fan, so that the automatic ceiling fan can automatically open, close and adjust the speed automatically according to the external environment. Automatic ceiling fans not only save electric energy to avoid the waste of resources, but also can automatically adjust the speed according to the indoor temperature. It is convenient for daily operation without manual speed regulation, making automatic ceiling fans more user-friendly.

The high-sensitive epoxy resin coating NTC thermistor produced by EXSENSE Electronics Technology Co., Ltd. plays the role of temperature monitoring, temperature protection and temperature control in household appliances such as ceiling fan, air conditioner, smart toilet, refrigerator, water dispenser,etc., effectively ensuring the normal operation of household appliances.