Notes arduino workshop_15

Arduino
Open Sourcing Imagination
myduino.com 1

Sypnopsis
 This workshop intends to expose participants to a much
simpler approach to microcontroller based on practical
problem-based approach.
 Enable participants to gain real-world experience to
monitor and control engineering processes and develop
competent skills.
 It has been specially designed for beginners and
educators
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Microcontroller
 Microcontrollers are dedicated to
one task and run one specific
program.
 Examples of tasks could be:
i. Received from inputs via ports
(read from external hardware)
ii. Stored data in file registers &
arithmetic operations (added,
subtracted, logic gates)
iii. Sent out data (control external
hardware)
 Processor, Storage and RAM all in
one tiny package
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With & Without A Microcontroller

Internal Architecture
Program
Memory Register
RAM EEPROM PORTS
Program Memory: Where all commands, written by users are stored
Register: To determine what action the uC takes in reference to the
program commands
RAM: Temporarily store data of any action
EEPROM: The data is retain even after power is switched-off
Ports: Bidirectional pins of Input and Output
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Arduino Uno Specifications
 Microcontroller: ATmega328
 Operating Voltage: 5V
 Input Voltage (recommended): 7-12V
 Input Voltage (limits): 6-20V
 Digital I/O Pins: 14 (of which 6 provide PWM
output)
 Analog Input Pins: 6
 DC Current per I/O Pin: 40 mA
 DC Current for 3.3V Pin: 50 mA
 Flash Memory: 32 KB (ATmega328) of which 0.5
KB used by bootloader
 SRAM: 2 KB (ATmega328)
 EEPROM: 1 KB (ATmega328)
 Clock Speed: 16 MHz
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Arduino Terminology
 “sketch” – a program you write to run on an
Arduino board
 “pin” – an input or output connected to
something. e.g. output to an LED, input from
a knob.
 Analog signals – directly measurable
quantities in terms of some other quantity
 Digital Signals – have only two states. For
digital computers, we refer to binary states, 0
and 1. “1” can be on, “0” can be off
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Workshop Summary
 Introduction to Arduino
 Setting up your Arduino Environment
 First Arduino sketch
 Making LEDs glow and blink
 How to read buttons/switches
 Analog Signals
 Serial Communication
 Digital Thermometer
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Participant Manifest
 Thumb drive with notes, arduino software for
Windows and source code (“sketches”) used
in class
 Arduino Starter Kit:
Arduino Uno Tactile push button
Half size breadboard Liquid Crystal Display
Jumper wires Piezo Buzzer
LEDs USB Cable
Resistors Temperature Sensor
Potentiometer
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Breadboard
 A breadboard (or protoboard)
is a construction base for
prototyping of electronics
 Wires and components are
simply pushed into the holes to
form a completed circuit and
power can be applied.
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Components: LED
 LED (Light Emitting Diode)
 What it Does: Emits light
when a small current is passed
through it.
 Leads: 2 (one longer, this one
connects to positive)
 Things to watch out for: Will
only work in one direction
 Looks like a mini light bulb. -
Requires a current limiting
resistor
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Resistors
 What it Does: Restricts
the amount of current
that can flow through a
circuit.
 Leads: 2
 Things to watch out
for: Easy to grab the
wrong value
 Cylinder with wires
extending from either
end. The value is
displayed using a color
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Potentiometer
 What it Does: Produces a
variable resistance dependant
on the angular position of the
shaft.
 Leads: 3
 Things to watch out for:
 Identifying: - Accidentally
buying logarithmic scale.
 They can be packaged in
many different form factors,
look for a dial to identify.
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Pushbutton
 What it Does: Completes a
circuit when it is pressed. 4
 Leads: 4
 A little square with leads out
the bottom and a button on the
top.
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Piezo Element
 What it Does: A pulse of
current will cause it to click. A
stream of pulses will cause it
to emit a tone.
 Leads: 2
 Things to watch out for:
Difficult to misuse.
 In this kit it comes in a little
black barrel, but sometimes
they are just a gold disc
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Temperature Sensor (LM35)
 The LM35 series are precision integrated-circuit
temperature sensors, whose output voltage is linearly
proportional to the Celsius (Centigrade) temperature.
 The LM35 is rated to operate over a −55° to +150°C
temperature range, and has a linear + 10.0 mV/°C scale
factor.
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Liquid Crystal Display
 An LCD has the advantage of
displaying alpha-numeric
characters and even user-
defined graphics.
 It also offers the ability for
lower power consumption,
making it ideal for battery
operated systems.
 It comes in a wide variety of
shapes and sizes with line
lengths of 8, 16, 20, 24, 32 and
40 characters, in one, two and
four line versions.
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What is Electricity
 A fan contains a small battery,
a couple of wires, a switch and
an electric motor.
 If you turn the switch on, the
motor will start to spin
 Battery is both a water
reservoir and a pump, the
switch is a tap, and the motor
is one of those wheels that you
see in watermills.
 When you open the tap, water
flows from the pump and
pushes the wheel into motion.
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The hydraulic system
 Increasing the size of the pipes
allows a greater flow of water
to go through them, effectively
reduced the pipes' resistance
to the flow of water.
 This approach works up to a
certain point, at which the
wheel won't spin any faster,
because the pressure of the
water is not strong enough.
 When we reach this point, we
need the pump to be stronger.
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Voltage, Current & Resistance
 So when you read that a battery's voltage is 9 V, think of this voltage
like the water pressure that can potentially be produced by this little
"pump".
 The flow rate of water relates to current, and is measured in
amperes.
 Finally, the resistance opposing the flow of current over any path
that it travels is called resistance, and is measured in ohms.
 Relationship: A higher voltage (pressure) lets you spin a wheel
faster; a higher flow rate (current) lets you spin a larger wheel.
 Ohms Law, V = IR
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 Breadboards have small holes for jumper wires and
components to be plugged into.

Construct Circuit 1
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Construct Circuit 2
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Select Board & Com Port
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Blinking an LED
digitalWrite
 The Arduino board comes with
an LED preinstalled. It's
marked "L". You can also add
your own LED
 Tell Arduino what to do.
 This is done through code, that
is, a list of instructions that we
give the microcontroller to
make it do what we want.
 Blink an LED is the Hello
World of physical computing
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Built-in Examples
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Push Button – digitalRead

Pulse Width Modulation (PWM)
 If you blink the LED fast
enough, you don't see it blink
any more, but you can change
its brightness by changing the
ratio between the on time and
the off time.
 This technique also works with
devices other than an LED.
For example, you can change
the speed of a motor in the
same way
 analogWrite(9,128) will set the
brightness of an LED
connected to pin 9 to 50%.

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Arduino PWM
8 Bits
Data Vout
x 0.0196
0
To
255
0
To
5V
PWM Output (Vout) = Data
5V 255
PWM Output (Vout) = Data x 5 V
255
= Data x 0.0196
Ex: If Data = 128; Vout = 128 x 0.0196 = 2.5088 V
analogWrite (PWM_pin, 128); // Will give an output of 2.5088 V

Analogue Input
 This is the difference
between an on/off
sensor (which tells us
whether something is
there) and an analogue
sensor, whose value
continuously changes.
 By using the
analogRead() function,
we can read the voltage
applied to one of the
pins. This function
returns a number
between 0 and 1023,
which represents
voltages between 0 and
5 volts
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Number of iterations (steps) for an ADC is
calculated as follows:
2N
= Number of steps.
Where N corresponds to the number of bits
Ex: 2 bits, 22
= 4
Resolution = Voltage Range = 5V = 1.25
No of steps 4
Vin Dout
0 – 1.25 0
1.25 – 2.5 1
2.5 – 3.75 2
3.75 - 5 3

Arduino ADC Calculations
 10 bit ADC, 210
= 1024 steps
 The resolution of an ADC is calculated as follows:
Resolution = Voltage Range = 5V = 0.00488 V
No of steps 1024
 The output of the ADC is calculated as follows:
ADC Output (dout) = Vin = 3.3 = 676
Resolution 0.00488
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ADC Output (dout) = Vin = 3.3 = 676
Resolution 0.00488
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ADC Arduino
10 bits
vin dout
÷ 0.00488
x 0.00488
Vin = dout x Resolution = 676 x 0.00488 = 3.3

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Producing Variable Voltage

Temperature Sensor (LM35)
 The LM35 series are precision integrated-circuit
temperature sensors, whose output voltage is linearly
proportional to the Celsius (Centigrade) temperature.
 The LM35 is rated to operate over a −55° to +150°C
temperature range, and has a linear + 10.0 mV/°C scale
factor.
myduino.com 46

Liquid Crystal Display
 An LCD has the advantage of
displaying alpha-numeric
characters and even user-
defined graphics.
 It also offers the ability for
lower power consumption,
making it ideal for battery
operated systems.
 It comes in a wide variety of
shapes and sizes with line
lengths of 8, 16, 20, 24, 32 and
40 characters, in one, two and
four line versions.
myduino.com 48

Connecting your LCD (Backlight)
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Connecting your Power & Contrast
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Connecting your Bus Wiring
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LCD 14 13 12 11 10 9 8 7 6 5 4 3 2 1
7 6 5 4 3 GND 2 POT 5V GND

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Reconnecting your LM35

Arduino Library
 A library is a big collection of related procedures.
 If you, say, want to control a motor, you may want
to find a Motor Control Library: a collection of
procedures that have already been written for you
that you can use without having to do the dirty
work of learning the nuances of motors.
 One of the best features of the Arduino project is
the ability to add on pre-crafted libraries that add
hardware support. There's tons of them, and you
can pick and choose which to install.

Arduino Library
 A library is a folder with some files in it, the files will end
in .cpp (C++ code file) and .h (C++ header file).
 Two optional files are keywords.txt (this is a hints file to
tell the Arduino IDE how to colorize your sketch and
examples folder, which may have some handy test-
sketches.

How to Install Library
 Download your desired library
(normally in a compressed zip file)
 Find the zip file on your local computer
(wherever downloaded files end up).
Under Windows, you should be able to
double click on the file to open it up.
Older windows, winrar or winzip will
pop-up.
 Copy the file and paste in inside the
libraries folder in your Arduino
directory.

GOOD SITES:
1. myduino.com
2. http://www.facebook.com/groups/arduinomalaysia/?
ref=ts&fref=ts
3. http://tronixstuff.wordpress.com/
4. http://bildr.org/
5. http://www.instructables.com
6. http://www.jeremyblum.com/category/arduino-tutorials/
7. http://letsmakerobots.com/start
8. http://hackaday.com
9. http://playground.arduino.cc/

Notes arduino workshop_15

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