A house automatically fill light circuit

The circuit consists of three parts: a light control section, a time control section, and a power supply section. The light control section utilizes a photoresistor (Rg) and a variable resistor (RP) to detect light levels. During the day, when light intensity is high, Rg has low resistance, which causes the voltage at point A to rise, resulting in a low output from pin 3 of the integrated circuit (IC). When the light level decreases, the resistance of the photoresistor increases, lowering the voltage at point A. If this voltage falls below half the supply voltage (less than 4V), the IC outputs a high signal, which is filtered by a capacitor to control the lighting. The circuit includes resistors and capacitors to prevent interference. The time control section, powered by the light control circuit, uses an integrated circuit that operates as a binary counter and oscillator. The frequency of the oscillator can be adjusted, affecting the delay between output pulses. This signal, after passing through a diode, stops the oscillator and activates a transistor to turn off the lights. The optical gate (4N25) and triac control the AC circuit, activating it when the light control circuit detects darkness. The AC contactor remains energized until a set time elapses, at which point the lights are turned off. The power supply section includes a transformer and a full-bridge rectifier to provide a steady 12V output.

The circuit design is structured into three distinct sections: the light control section, the time control section, and the power supply section, each serving a specific function to ensure the overall operation of the system.

The light control section employs a photoresistor (Rg) and an adjustable resistor (RP) to monitor ambient light levels. During daylight, the low resistance of Rg allows for a higher voltage at point A, leading to a low output signal from pin 3 of the integrated circuit (IC). Conversely, as light diminishes, the resistance of the photoresistor increases, causing a drop in voltage at point A. When this voltage falls below 4V, the IC outputs a high signal, which is then processed through a filtering capacitor to control the lighting system.

The time control section is powered by the light control circuit and features an integrated circuit configured as a binary counter and oscillator. The oscillator's frequency can be adjusted by changing the value of the variable resistor (RP2), which directly influences the timing of the output pulses. These pulses are essential for controlling the duration for which the lights remain on. The output signal from the IC is routed through a diode to halt the oscillator's operation while simultaneously activating a transistor (VT) that controls the lighting circuit.

In the power supply section, a transformer is used to step down the voltage, which is then converted to a steady DC output using a full-bridge rectifier and filtering capacitors. This ensures that the circuit receives a stable 12V power supply necessary for reliable operation.

The overall circuit is designed to provide automated lighting control based on ambient light levels, with a timed delay feature to ensure that the lights turn off after a predetermined duration, effectively managing power consumption and enhancing convenience. Circuit consists of three parts is light-control section 5: Two foot f light time control section; the third is the implementation part of dry i power supply section. JCz (NE55 5) Dry Il photoresistor Rg. J transfer resistance RP, resistor R, capacitor C composed of light Zhu circuit. When the light is strong during the day, Rg2.f low resistance, photosensitive resistance Rgfll adjustable resistor divided voltage point A is high, the pAIC2 section (3) pin output low; when f according weakened, photoresistor resistance value by twenty Tsang Tai Po, partial pressure value at point a gradually decreased, when the voltage at point a is lower than half the power supply voltage (less than 4V), integrated circuit Ic {flip, which (3) BW output high (approximately equal to the supply voltage), the outputs after filtering capacitor c time control lights as part of the power supply. Circuit resistor Ri and capacitor C, is the interference of H {, when the light control circuit to prevent lightning night I caused interference.

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