When it comes to the design of a breathing light, perhaps everyone thinks of Apple first. Indeed, starting from the powerbook g3 and ibook, Apple's laptops began to incorporate the design of a breathing light. As long as the user closes the notebook, the sleep indicator light on the front of the notebook will flash like a breath. When first appeared in front of everyone, people were more than admired Apple's infinite creativity. Many people also want to make a breathing light on their own, and play a decorative and work status indicator effect. Below, we introduce the circuit of several breathing lights.
1. Understand Respiratory Characteristics and Time Parameters Breathing is divided into two processes: Inspiration: The exponential curve rises, the process requires 1.5S exhalation: the exponential curve decreases, the process requires 1.5S. For adults, the average breath 16 ~18 times; for children, average 20 breaths per minute;
The above parameter is the number of times in a uniform breathing situation. Can be used to indicate when sleeping.
2. Breathing Light Demo There is a video presentation on Youku, address: http://player.youku.com/player.php/sid/XNDM4MjM3ODA=/v.swf"
3, breathing light circuit
Component name: 5mm LED highlight blue light 1 LM1458N (or HA17458) dual op amp 1 2N3904 (8050, 8550) NPN transistor (TO92 package) 1 22uF 100V / 47uF 35v / 47uF 50V capacitor 1 47K [1 /4w] 4 100K [1/4w] 2 100 ohm 1
Note: Changing the size of the capacitor or R3 can change the respiratory rate. After experiments, R3 changed to two 47K resistors in series to achieve better results, and the frequency of breathing was more appropriate.
In addition, the input voltage on the three 1N4007 drop pressure, so that the effect will be better, breathing light will have a short extinguishing time. (Only suitable for green and blue LED lights, red LED will not have extinguishing time because of relatively low light-emitting voltage, and can achieve a result by re-stringing some 1N4007.) In addition, LM1458 is a dual op amp with almost all of NE5532, CA1558, etc. As for the operating voltage, the input of 100 Euro is removed, directly on the 7.2 no problem ~
A Taiwanese netizen's breathing light circuit
Another breathing light circuit
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