Transcript Electronic game - Year9moisturetester

Electronics
Moisture Tester
The project – research/brief/specification
Electronic theory
Resistance
The Engineer
Making a circuit
soldering
Objectives
Write a design brief and specification which
reflects the use of a moisture tester.
Task outcome
Develop a mood board
Using the mood board to brainstorm ideas.
Write a design brief
Develop a specification.
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BACKGROUND TO PROJECT
The circuit you are going to make will detect
if something is wet (has enough
moisture), it detects a change in the
amount of moisture present. You can use
this circuit in a number of different
situation where moisture/water is present.
Think about when you would want to know if
something is too dry.
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Using the internet produce a mood board of images that you could use
your moisture detector for. Here are a few to get you started.
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The electronic product that you will build can detect a CHANGE in the
amount of moisture present. Use your mood board to help you complete
the mind map below with possible uses for this idea.
Cat needs
more milk in
bowl
Moisture
Tester
Content list
• Design Brief
• I am going to design and
manufacture a product which can be
used to
_____________________________
________. My product will be used
by __________________ in order
to____________________________
. The location in which I expect my
product to be used is
______________________.
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• Specification
•
•
•
•
•
•
•
•
•
Your specification should detail all the things that your product should
be able to do or should have.
My product should be able to detect a change in moisture level
My product should be powered by ___________________.
My product should look _____________________________.
My product should be safe and therefore
_________________________.
Try to think of three other points to add to your Specifications
________________________________________________________
________________________________________________________
________________________________________________________
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Objectives
Explain how a simple circuit works and the
purpose of the components in the circuit.
Task outcome
Draw out a simple circuit and explain how it works.
Explain how insulators and conductors work and their
function in a circuit.
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So what is a Circuit?…
A circuit is something that electricity flows around.
It is the same
for electricity.
If the circuit is
broken, the
electricity cannot
get around the
track and nothing
will happen,
ie, the light
wont come on.
It is a bit like a
race track the track must
be complete for
the car to get
round, otherwise,
it cant go any
further.
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The plastic part of the switch is an insulator.
No electrons can get past.
The metal part of the
switch is a conductor.
The electrons can get
through when the
switch is closed.
The electrons will not do anything
unless they are pushed. This is
where they get the push or
potential.
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The electrons are heading for the bulb when they pass through the bulb
they give off energy which they got from the battery. They must
however get rid of all the energy before they return to the battery. If
they started with 9V then they have to get rid of the 9V in the bulb.
They must have 0V on leaving the bulb. What do you think would
happen if the voltage was increased to 100V? Use crocodile clips to find
out.
The resistor
protects the LED
if the battery is to
large.
Led’S are very
small delicate
lights. They come
in different colours
and only draw a
small amount of
current so the
battery last a long
time.
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Objectives
Select the correct resistor using a multi
meter and colour code.
Task outcome
Develop a colour code chart
Using the chart to work out the resistance of a selection of
resistors
Explain how a multi meter works
Use the multi meter to determine the value of a selection of
resistors.
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Resistors…
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•
Resistors are used to control the flow of
electricity around a circuit.
•
Resistors are measured in Ohms (Ω),
and there are lots of different values.
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Resistor Colour Codes
Black
0
Brown
1
Red
2
Orange
3
Yellow
4
Green
5
Blue
6
Violet
7
Grey
8
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White
9
1. Print this page
2. Colour each disc as indicated
3. Cut out the discs
4. Make a hole in the centre of each disc
5. Stack the discs and fasten together
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Objectives
Soldering
Task outcome
http://year9moisturetester.wikispaces.com/
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Objectives
Explain the need for Engineers and the
moral responsibility that Engineers have.
Task outcome
Produce a leaflet that explains the role of five different
types of Engineering.
Produce a poster that reflects the good work that
Engineers do.
Produce a poster that reflects on the products that
Engineers have design that cause harm to mankind.
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What do Engineers do?
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Objectives
Use YENKA to design and test electronic
circuits.
Task outcome
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