Design of sound and light controlled intelligent lamp based on NE555

1 Project Introduction
    The sound and light controlled smart lamp design based on NE555 integrates sound control, light control and time-delay automatic control technology. When the toggle switch S1 is not turned on, the VOUT indicator light will be powered on and light up when the microphone MIC collects sound. When the toggle switch S1 is turned on, it is self-locked by light control. When the photoresistor LDR is affected by light, that is, when the light is strong, it will not be powered on and light up even if there is sound; when the photoresistor LDR is not affected by light, that is, when the light is dark, the indicator light VOUT will be powered on and light up when there is sound. The lighting duration of the VOUT indicator light can be changed by adjusting the resistance value of the potentiometer RP1.
2 Overall Scheme
    The overall scheme system block diagram is shown in the figure. The sound and light controlled smart lamp circuit is a sound and light two-level control lighting circuit. The induction control of the light intensity of the lighting switch is the first-level switch, and the induction control of the sound is the second-level switch. The delay control is realized by the monostable trigger circuit composed of the NE555 timer.
Figure 2-1 Block diagram of the sound and light controlled intelligent lamp system based on NE555
3 Circuit principle
    The power supply part adopts a Micro USB interface sink board design, with 5.08mm_3P screw terminal on board, which can be connected to an external power supply and output VOUT voltage. When powered on, the diode D1 prevents backflow, the POWER indicator lights up, and the power supply is normal.
    When the toggle switch S1 is not turned on, the photoresistor LDR does not work, the microphone MIC collects the sound signal, which is amplified by the transistors Q1 and Q2 to the 2nd pin of the NE555 timer to trigger, the 3rd pin of the NE555 timer outputs a high level, and the VOUT indicator lights up.
    When the toggle switch S1 is turned on, when the light is strong during the day, the photoresistor LDR is affected by the light, the resistance value decreases, the voltage of the 4th pin of the NE555 timer is pulled down, and the NE555 timer is reset. Even if the microphone MIC collects the sound signal, the 3rd pin of the NE555 timer always outputs a low level, and the VOUT indicator does not light up. When the ambient light gets darker in the evening, the photoresistor LDR is not affected by the light, and its resistance increases. The voltage at pin 4 of the NE555 timer increases, and the NE555 timer works normally. The microphone MIC collects the sound signal, which is amplified by transistors Q1 and Q2 to trigger pin 2 of the NE555 timer. Pin 3 of the NE555 timer outputs a high level, and the VOUT indicator lights up. After the sound disappears, the NE555 is in a temporary steady state. When the voltage of capacitor C2 is charged and increases to the threshold voltage 2/3VCC of pin 6 of the NE555 timer, pin 7 presents a low impedance state, and capacitor C2 discharges to the ground through the inside of pin 7. The voltage at pin 3 becomes a low level, and the VOUT indicator turns off.
    The length of time the NE555 temporary steady state works determines the length of time the VOUT indicator lights up. By adjusting the resistance of potentiometer RP1, the pulse frequency and duty cycle generated by pin 3 of the NE555 timer can be changed. When the resistance of the potentiometer decreases, the VOUT indicator light turns on for a shorter time; when the resistance of the potentiometer increases, the VOUT indicator light turns on for a longer time. 4 R8 2MΩ RES-TH_1/4W 1 C115329 5 R9 1MΩ RES -TH_1/4W 1 C61306 6 R10 33KΩ
RES - TH_1/4W 1 C70762 7 R11 4.7KΩ RES-TH_1/4W 2 C61297 8 R12 10KΩ RES - TH_1 /
 
4W 2 C410695 9 R13 2MΩ RES - TH_1 /4W 1 C115329 10 R14 2MΩ RES-TH_1/4W 1 C61306 11 R15 33KΩ RES-TH_1/4W 1 C70762 12 R16 2.7KΩ RES-TH_1/4W 2 C61297 13 R17 22KΩ RES-TH_1/ 4W 1 C172986 14 C58671 9 R9 49.9KΩ RES-TH_1/4W 1 C2843025 10 R10 1.2KΩ RES-TH_1/4W 1 C58590 11 RP1 1MΩ RES-ADJ-TH_2.54mm_3P 1 C118944 12 LDR MG-52B RES-TH-5mm 1 C55 9383 13 C1,C2 104 CAP-TH_2.54mm 2 C353909 14 C3 10uF CAP-TH_1.5mm 1 C43798 15 C4 103 CAP-TH_2.54mm 1 C377844 16 D1 1N4007 DO-41 1 C189226 17







































































































24 CN1 CONN - TH_3p CONN - TH_5.08mm_3P 1 C2915640 25 TP1 ~
TP4 copper column screw M3 × 10 + 6 4 C551322 26 -​​​​​​​​​​​​​​​​​​​​​​​​​​​​​ PCB blank board - 1 - 5 Soldering assembly Figure 5-1 Sound and light control smart light kit based on NE555 Figure 5-2 Sound and light control smart light assembly diagram based on NE555 Figure 5-3 Actual picture of sound and light control smart light based on NE555