light sensor / ldr dark sensor circuit

5 months ago 257
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Description

This a highly sensitive and very interesting and most useful Dark detector circuit using LDR and comparator IC LM358. Automatic Light Switch off in the day and automatic switch on at night. This is very sensitive LDR darkness circuit using LM 358. This circuit does not use the relay. The load is connected with triac. No flicker. side area of LDR should cover with black tape for protection of light falling of Load bulb or LDR should not get the light of output load light for flicker less operation. This circuit uses 220v ac so this a dangerous circuit so be careful when testing. for more circuit diagram go to https://www.circuitspedia.com/

Documents

LDR based dark sensor automatic light switch circuit diagram

PCB_2020-06-26_12-06-40

BOM

ID Name Designator Footprint Quantity
1 1N4007 D1,D2,D3,D4 DO-41_BD2.4-L4.7-P8.70-D0.9-RD 4
2 10K R3 RES-TH_BD2.4-L6.3-P10.30-D0.6 1
3 22K R6 RES-ADJ-TH_EVND8AA 1
4 100uF C2 CAP-TH_BD6.3-P2.50-D1.0-FD 1
5 BT138 Q2 TO-220-3_L10.0-W4.5-P2.54-L 1
6 HDR-M-2.54_1x1 J3 HDR-M-2.54_1X1 1
7 CONNECTOR J4,J2,J5 HDR-M-2.54_1X1 3
8 220 R5 RES-TH_BD2.2-L6.5-P10.50-D0.6 1
9 HDR-M-2.54_1x2 J1 HDR-M-2.54_1X2 1
10 220nF C3 CAP-TH_L6.0-W4.0-P5.00-D1.2 1
11 1000uF C1 CAP-TH_BD10.0-P5.00-D1.0-FD 1
12 MOC3021 U2 DIP-6_L8.5-W6.4-P2.54-LS7.6-BL 1
13 510 R2 RES-TH_BD2.2-L6.5-P10.50-D0.6 1
14 BC548B Q1 TO-92-3_L4.9-W3.7-P1.27-L 1
15 PHOTOCELLPTH-KIT R1 PHOTOCELL-KIT 1
16 LM358N U4 PDIP-8_L10.2-W5.9-P2.54-LS7.6-BL 1

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