When the car is driving at night, continuous use of the high beam is not allowed for more than 2 seconds, and the high beam is not allowed when the car is in use. When the other vehicle's lamp shines on the photocell battery G of the vehicle, an electromotive force is generated on the photocell photocell, amplified by a measuring amplifier composed of N1, N2, and N3, and R1 is a magnification adjusting resistor, the amplified signal and a given voltage. Compare on N4, if it is greater than the given voltage, N4 outputs low level, NE555 is forced to reset, also outputs low level, 9013 is cut off, K is off, and the lamp works in low beam state. If the other car's headlights or ambient light is not strong, after amplification is less than the given voltage, N4 outputs a high level, NE555 pin 4 is high, then NE555 is in an oscillating state, D is a switch-switching diode diode, which makes the output For high and low levels, the time is basically the same, both are 0.693RC. This circuit is designed for about 1.9 seconds. In this case, the headlights work in a state of 1.9 seconds high beam and 1.9 seconds of close light. R2 is used to adjust the given voltage of N4. It should be sized to not dazzle the driver and prevent the spurs from interfering with the automatic operation of the automatic switch.
A humidifier is beneficial to increase the air humidity and stabilize the indoor air in a healthy and reasonable state. At the same time relieve dry skin, promote blood circulation and metabolism of facial cells, relieve nervous tension and eliminate fatigue. It is beneficial to protect the respiratory tract and avoid inducing various respiratory diseases. When the air humidity is suitable, it is difficult for germs to spread, which is beneficial to human health.
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