Abstract
In modern society, along with electronic technology's development and the time progress, now society's people more and more pay great attention in the life the hygiene condition. The energy conservation environmental protection automatic hand-dryer are one kind of upscale hygienic sanitary equipment, widely applies in the guesthouse hotel, the public toilet and so on public place washroom.
Operation principle of hand-dryer is using an induction infrared circuit switch. When the hand is offered, infrared switch will open the electric dryer automatically. When people leave, the dryer will close automatically. The basic circuit of hand dryer’s auto-induction make up of power supply circuit, 555 timer switch circuit, infrared transmitting and receiving circuit, signal processing circuits and fan circuit.
In the process of designing 555 timer circuit I have a detailed understanding of the classroom can not be learned learned. Through practice I also learned of their knowledge of all aspects of a summary, improved self-learning ability and the ability to obtain new knowledge. Through the
design, I found to improve the problem, problem-solving skills, and observation of the problem more acute than before, and to consider the issue more comprehensive.
Keywords:hand-dryer; 555 time cut-outs; infrared