This document describes a simple DIY electronics project called the Sunlight Controlled Light Electronics project. It functions as a street light that is powered by sunlight during the day and turns on automatically at night. The project uses a phototransistor to sense light levels and control two other transistors to drive 12 LEDs. When sunlight is present, the phototransistor conducts and the LEDs remain off, but in the absence of light, the transistors power the LEDs. The project aims to demonstrate energy conservation by only using lighting when needed.

2. Energy conservation is a major topic of discussion
nowadays. To solve the problem of energy wastage,
technological experts are putting out great efforts.
 Most of the energy usage reports indicate that major
part of the energy is used at night hours.
 In such a situation, Sunlight Controlled Light
Electronics project found to be a very useful and
interesting simple DIY electronics project model for
street light used at the society.
 This is, simple DIY electronics project that can be
implemented and demonstrated by the students with
ease and also they can convey the need of saving
energy.

4. Unit requires
reflected sunlight
for satisfactorily
working.
Do not face sensor
directly to bright
sunlight . In
presence of
sunlight sensor
conducts.
Then both transistors
stop conduction and
L.E.D’S will not be
driven . But in absence
of light transistors
conduct and L.E.D’S
are activated.

5. Unit can be
tested by
converting
sensor with
fingers.
This project will
work with sunlight
and light from
filament bulb not
with tube light or
C.F.L. emitting
fluorescent light.
By adjusting
1 MEG
present
sensitivity of
project can
be adjust.

7. MATERIALS REQUIRED.
12 White L.E.D.-
Photo-transistor -
Simple Resistors & Capacitors -
Transistor -
Power supply -
PCB board -

8.  The function of each LED is to act as a light source in
the S.C.L. CIRCUIT.
 Light sensing is done by the phototransistor which
converts the light sensed into current.
 The other two transistors in the kit are required to drive
the LED’s.
 In sunlight conditions the phototransistor conducts and
both the other transistors will not conduct.
 In the absence of sunlight, light sensor phototransistor
will not conduct and the other transistors will conduct
and finally it will drive the LED’s.
 Power supply required for this board is 12V DC.

10. LED EVEN
GLOWS IN
DARKNESS!!!
RESULT
COST-
₨.210/-

11. -LIGHT
DECOR
-STREET
LIGHTS
-STORAGE
PURPOSE
-INDUSTRY
PURPOSE

12. THANKYOU