Automatic light switching controller

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This electronic system is used in staircases or some other places where it is needed to have an automatic light switching controller. It's a device which turns on the light only when there is dark around and the switch is pressed. It will be turned off after the high state on the output of 555 has been over, according to the formula: t=1,1R2*C5. If you want to control some LED eg. COB instead of small bulb 12V/21W, you are able to power this light with a separate power supply with any voltage. Don't forget to put on the right jumper!


Automatic light switching controller - scheme

Automatic light switching controller - PCB


ID Name Designator Footprint Quantity Manufacturer Part Manufacturer Supplier Supplier Part Price LCSC Assembly Mounted BOM_Supplier BOM_Manufacturer BOM_Manufacturer Part BOM_Supplier Part
1 470uF C5,C4 CAP-D12.5XF5.0 2 LCSC ValuePro 470uF 63V 13*25Black high frequency C47899
2 Input xV P3 WJ126V-5.0-2P 1 LCSC ReliaPro WJ126V-5.0-2P C8404
3 Input 15VDC P2 WJ126V-5.0-2P 1 LCSC ReliaPro WJ126V-5.0-2P C8404
4 Bulb or LED P4 WJ126V-5.0-2P 1 LCSC ReliaPro WJ126V-5.0-2P C8404
5 Input 12VAC P1 WJ126V-5.0-2P 1 LCSC ReliaPro WJ126V-5.0-2P C8404
6 10k R1,R2,R3 AXIAL-0.3 3
7 2200uF C1 CAP-TH_BD10.0-P5.00-D1.0-FD 1 LCSC ValuePro 16V2200uf 10X20 C3328
8 IRF730 Q1 TO-220(TO-220-3) 1 LCSC IR IRF730PBF C2602
9 Photoresistor R5 RES-PHOTO_CDS 1 LCSC ReliaPro GL5549(80-100) C10078
10 NE555P U2 NE555 1 LCSC TI NE555P C46749
11 L7812CV U1 TO-220(TO-220-3) 1 LCSC STMicroelectronics L7812CV-DG C2914
12 100n C2,C6,C3 RAD-0.1 3
13 Header - voltage the same JP1 HDR-2X1/2.54 1 LCSC Amphenol ICC 54102-T08-00 C213181
14 Header - voltage other JP2 HDR-2X1/2.54 1 LCSC Amphenol ICC 54102-T08-00 C213181
15 10k R4 POTENTIOMETER W.L 1 Potentiometer
16 GBU405 D1 BRIDGE-GBU 1 LCSC MDD GBU406 Rectifier bridge C13432
17 SW SW1 KEY-4.5*4.5-2 1 LCSC Rectangular Connectors - Contacts K2-1109DP-G4SW-01 C223800


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