Making a Night Light

Making a Night Light

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Making a Night Light


A nightlight provides light at the change of the light- mostly at
night. The definition of light night is so that night passers will be
able to see more clearly, drivers will be able to drive safely and
accidents will be avoided. Nightlight requires LDR (Light Dependent
Resistor). The resistor changes its resistance depending on the amount
of light it receives. LDR is also used to monitor light intensity
level. A resistor, which reduces the flow of current in circuit, is
also needed. 555 microprocessor the brain is also needed to control
the flow of energy from the power supply to the components. Battery
will be used to supply voltage for the circuit.

We detect a light level using a LDR. The LDR then send signal to the
LED providing us with the output of light.



AIM
===

The aim of this investigation is to make a nightlight. The light will
be produce using an LED (Light Emitting Diode), which will provide
small bright light.

[IMAGE]LED Diode provides small bright light, and is mostly used in
computer, TVs, remote controls, mobile phones, and on many more
electrical appliances.

[IMAGE]LDR Can be used to monitor light intensity level. It changes
its resistance depending on the amount of light.

[IMAGE]555 microprocessor Looks like spider with its eight legs. It is
a small chip, which controls the flow of energy within the circuit- it
acts like the brain of the circuit as everything as to be connected to
it.

[IMAGE]RESISTOR This reduces the flow of current in the circuit.

Duracell Ultra Alkaline 9V Batteries, 2 Pack

BATTERY 9v battery will be needed to supply voltage to the circuit.

We tested the nightlight by covering up the LDR with a finger; this
makes the light brighten up. However when I removed the finger from
the LDR the LED went off. When there is no light the LED comes on,
however when there is light getting into the LDR the LED goes off.

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The
LED only comes on when it is dark therefore when the LDR is uncovered
it will reflect lights switch off the LED.

At first when I first made the circuit it did not work, therefore I
asked the technicians to help me test the components, the physics and
technology teachers to check the circuit. They did this and I was
given a full results on the problem. There was a missing cable and
another cable was misplaced. I then used this information to repeat
the circuit. Following the information helped me to complete the
circuit to my best of ability. After the LED had come on during my
covering of the LDR and switch off when I take my finger of the LDR, I
was able to see that the circuit was working perfectly.

After this I used a light meter to measured the light intensity, this
is so that at some levels the nightlights will responds. I then drew a
table of it.

Space

Light Intensity/ Lux

Dark room

6

Sunlight

700

Shade

102

Looking at the result, I wished that the levels of nightlight had
responded faster that it had done.

EVALUATION

At first when I made the circuit, it did not work, therefore I asked
an expert to help me look at the components and the board. The
technicians looked at them and then they gave me a full report on the
circuit- this helped me to then repeat the circuit again. After
repeating the circuit I noticed where my mistakes occurred and I was
able to correct them. While I was connecting the circuit the first
time I had missed out a cable. I took a notice of this and repeat the
circuit again.

At the end I had a working circuit. The circuit worked perfectly after
I had covered the LDR up with my finger, then remove it to see the
reaction without the LDR being cover.

The experiment had worked according to how I had planned it however I
do wish that the level of nightlight could have respond faster than it
had done. Apart from this nothing else need considering. This
experiment was a experience for me, because in the pass when I had
made it nothing had gone wrong at the time and now seeing something
wrong showed me that learning from your mistakes is better than being
perfect at all time

DISCUSSION

When making a commercial product I would have to consider the costs of
the components, this is so that I will not use more than am supposed
to use. Then I would consider the light strength- considering the
light strength can help decrease the amount of money spent. Most
importantly bulb have to be consider, as you need the right voltage
bulb and a good quality of bulb should be use.
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