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Smart Staircase Light Timer

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Smart Staircase Light Timer
Smart Staircase Light Timer
Need a light timer for staircases? This design, made simply with logic gate ICs, has unique features. In addition to the standard timer function, it allows the activation cycle to be extended and also terminated instantly. The timer is programmable in a wide range of timings that span from 0.2 s to about 50 minutes. 
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Materials

Component list

Component List

Resistors

(All 0805, unless diff. noted)

R1 = 5.1 kΩ

R2 = 2.7 kΩ

R3, R7 = 4.7 kΩ

R4 = 47 kΩ

R5 = 470 kΩ

R6 = 50 kΩ Trimmer

R8 = 120 kΩ

R9, R10 = 12 kΩ

R11 = 22 kΩ

R12, R13 = 1.2 kΩ

R14 = 10D391K Varistor

 

Capacitors

C1, C2, C8…C10, C12 = 100 nF (0805)

C3 = 10 µF, 16 V, Electrolytic (4X5)

C4…C6 = 1 µF (0805)

C7 = 47 µF, 16 V, Electrolytic (5X5)

C11 =  100 µF, 16 V, Electrolytic (6X5)

 

Semiconductors

D1…D4 = 1N4148 Diode (MINIMELF)

D5 = M7 Diode

IC1 = CD4001D

IC2 = CD4060D

IC3 = CD4013D

T1 = BC817 Transistor

LED1 = Yellow LED, 3 mm

LED2 = Green LED, 3 mm

 

Miscellaneous

K1 = 12 V Relay 12 A RT114012

AL1 = 12 V DC Power supply, PCB Type

X1 = 2 Pole Screw Terminal Block

X2 = 4 Pole Screw Terminal Block

F1 = 500 mA T 5x20 Fuse

Fuse Holder 5x20, PCB mount

S1 = PCB push-button, N.O.

JP1 = 20 pin, dual line header, 0.1" pitch

 

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