Counter Based Automatic Room Power Controller

Fig-1 (Circuit diagram)

Fig-2 (Optical sensor arrangement)

Designed by: Pankaj D.Choudhury

D.M(E), NEEPCO Ltd.,

AGTP, Agartala, Tripura.

R7

R6

Dz2

C4

R8

R9

R10

LD

R1

R13

1

2

3

4

5

6

7

8

910

11

1

2

3

4

5

6

7

8

910

11

CD4017

CD4017

14

14

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

12

13

15

16

12

13

15

16

T2

D15

R16

T1

R14

LD1 LD2

LD

R2

C2

230vAC

12-0-12v, 250mATransformer

RL1

R15

Toswitch

C3 C7

C8

R11

N1

N2

N3

N4

N5

N6

N7

N8

N9

N10

N11

N12

A1

A2

A3

A4

IC1 (A1-A4) = LM324

D2

D4

D3

D1

IC27809

IC3

IC4

IC5 (N1-N4) = CD4081

IC6 (N5-N8) = CD4081 IC7 (N9-N12) = CD4081 D1-D15 = 1N4148 D16-D17 = 1N4007

D16

D171

2

3

45

6

7

8

9

10

1112

13

14

12

3

4

5

67

89

10

11

12

1314

1

2

3

45

6

7

8

9

10

1112

13

14

1

2

3

45

6

7

8

9

10

1112

13

14

+

+

-

-

IC2 = LM7809 IC3,4 = CD4017

T1,T2 = 2N547

C5 R12

C6

S1

Reset Switch

Dz1 C1

R5R4

6.8v

3.3v TR1

NO NC

R3R1 R2

LDR 1 LDR 2

Laser Laserdiode1 diode2