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Automatic Wash Basin Tap With LED Light

When waking up at night to use the wash basin, you may struggle to find the switchboard to turn on the light before opening the wash basin tap to wash your hands. To help, this automatic wash basin tap with built-in LED light has been designed using an IR module and 555 timer IC. The IR module is a very simple and compact device, which has transmitting and receiving IR LEDs and a comparator.

Author’s prototype
Fig. 1: Author’s prototype

This device opens the wash basin tap automatically and switches on the LED light fitted above the wash basin when one reaches in front of the wash basin. The wash basin tap and the LED light turn off automatically after a set time.

Fig. 2: Circuit diagram
Parts List
Semiconductors:
IC1-LM7805, 5V voltage regulator
IC2-NE555 timer
T1, T2-BD139 npn transistor
BR1-1A bridge rectifier
D1-1N4007 rectifier diode
LED1-5mm LED (green or red)
LED2-LED10-5mm white LED
Resistors (all 1/4-watt, ±5% carbon):
R1-R3, R8-1-kilo-ohm
R4-270-kilo-ohm
R5-R7-470-ohm
Capacitors:
C1-1000µF, 35V electrolytic
C2-0.01µF ceramic disk
C3-1000µF, 25V electrolytic
Miscellaneous:
CON1-2-pin connector
SV-12V solenoid valve normally closed type
X1-230V AC primary to 12V AC, 500mA secondary transformer

Circuit and working



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