Corridor light voice control switch

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Corridor light voice control switch [Copy link]

Corridor light voice control switch

Most of the corridors and stairwells in modern buildings are equipped with voice-activated or touch-sensitive time-delay automatic switches. This article introduces a voice-activated automatic switch that automatically resets after a delay of 3-4 minutes after it is turned on. It automatically turns off during the day and only works at night.

Figure 1 is an electrical schematic. The MIC electret microphone converts the sound signal it picks up into an electrical signal. Its negative signal turns the triode V, which is normally forward biased, into reverse biased cutoff. During the day, the photoresistor has a small resistance value due to light, and pin ① of CD40llB is at a low level, and F1 is disabled. At night, pin ① is at a high level, and after V is cut off, pin ② is also at a high level, so pin ③ outputs a low level, D2 outputs a high level, F3 outputs a low level, and P4 outputs a high level. The AC switch composed of SCR and D1-D4 is turned on, and the bulb DX lights up. At the same time, F2 outputs a high level to charge C3 with voltage. After the sound, C3 slowly discharges to R6. After a delay of 3-4 minutes, F3 can output a high level, F4 can output a low level, and SCR turns off when the AC voltage passes zero, and DX turns off.
The DC voltage of this circuit is supplied by bridge rectification of D1~D4, voltage division by R7 and R5, and filtering by C2.

Figure 2 is a printed circuit board diagram. MIC and RG are directly soldered on the board. The entire printed circuit board is installed in a switch box. Small holes are opened on the switch box panel to facilitate MIC to pick up sound and RC to transmit light.

ningyuhui

Could you provide "Figure 1 is the electrical schematic"?

ningyuhui

Are x1 and x2 connected to 220v AC signal? Then where is the light bulb connected?

fighting

Sorry, I deleted the picture.

ningyuhui

Thanks!