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Automatic opening and closing curtain controller circuit

2015-03-03 06:10  
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Automatic opening and closing curtain controller circuit
Automatic opening and closing curtain controller circuit
Automatic opening and closing curtain controller circuit
Automatic opening and closing curtain controller circuit
The controller can automatically identify the brightness of the room to make the curtains opening and closing with the best natural light. In Figure 1, photosensitive resistor RD and time base circuit 5G1555 form the brightness recognition part. when the it is black to a certain extent, photosensitive resistor RD's resistance increases, 5G1555 ② foot potential is less than 1/3Vcc ≈ 2.1V, ③ foot outputs a high potential, BG2 and BG3 are cut off, J2 releases. At the same time, D1, BG1 get conduction, J1 pulls in.