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예제 03A: Turn on LED when the button is pressed
and keep it on after it is released
Copy and paste this example into an empty Arduino sketch
the pin for the LED
the input pin where the
pushbutton is connected
val will be used to store the state
of the input pin
0 = LED off while 1 = LED on
tell Arduino LED is an output
and BUTTON is an input
read input value and store it
check if the input is HIGH (button pressed)
and change the state
turn LED ON
예제 05: Turn on LED when the button is pressed
including simple de-bouncing.
If the button is held, brightness changes.
input pin of the pushbutton
stores the state of the input pin
stores the previous value of "val"
Stores the brightness value
when did we begin pressing?
yum, fresh
check if there was a transition
change the state from off to on
or vice-versa
millis() is the Arduino clock
it returns how many milliseconds
have passed since the board has
been reset.
(this line remembers when the button
was last pressed)
check whether the button is being held down
If the button is held for more than 500ms.
increment brightness by 1
delay to avoid brightness going
up too fast
255 is the max brightness
if we go over 255
let’s go back to 0
val is now old, let’s store it
turn LED ON at the
current brightness level
turn LED OFF
예제 03C: Turn on LED when the button is pressed
including simple de-bouncing
Now with another new and improved formula!!
this variable stores the previous
value of "val"
0 = LED off and 1 = LED on
val is now old, let's store it
예제 04: Fade an LED in and out like on
a sleeping Apple computer
We’ll use this to count up and down
loop from 0 to 254 (fade in)
set the LED brightness
Wait 10ms because analogWrite
is instantaneous and we would
not see any change
loop from 255 to 1 (fade out)
Wait 10ms
예제 06A: Blink LED at a rate specified by the
value of the analogue input
variable used to store the value
coming from the sensor
LED is as an OUTPUT
Note: Analogue pins are
automatically set as inputs
read the value from
the sensor
turn the LED on
stop the program for
some time
turn the LED off
예제 07: Send to the computer the values read from
analogue input 0
Make sure you click on "Serial Monitor"
after you upload
select the input pin for the
sensor resistor
variable to store the value coming
from the sensor
open the serial port to send
data back to the computer at
9600 bits per second
print the value to
the serial port
wait 100ms between
each send
예제 08B: Arduino Networked Lamp
variable to store the value coming from the sensor
open the serial port
read the value from the sensor
read the incoming byte:
If the marker's found, next 6 characters are the colour
accumulate 6 chars
store in the buffer
move the pointer forward by 1
now we have the 3 numbers stored as hex numbers
we need to decode them into 3 bytes r, g and b
reset the pointer so we can reuse the buffer
Check if there was a transition
if the lamp is on
turn the leds on
at the colour
sent by the computer
otherwise turn off
wait 100ms between each send
converts one HEX character into a number
예제 02: Turn on LED while the button is pressed
check whether the input is HIGH (button pressed)
예제 03B: Turn on LED when the button is pressed
Now with a new and improved formula!
예제 06B: Set the brightness of LED to
a brightness specified by the
turn the LED on at
the brightness set
by the sensor
예제 01 : Blinking LED
LED connected to
digital pin 13
sets the digital
pin as output
turns the LED on
waits for a second
turns the LED off
예제 08A: Arduino networked lamp
parts of the code are inspired
by a blog post by Tod E. Kurt (todbot.com)
Copy and paste this example into an empty Processing sketch
retrieve feed every 60 seconds;
the last time we fetched the content
light level measured by the lamp
Accumulates characters coming from Arduino
we don't need fast updates
IMPORTANT NOTE:
The first serial port retrieved by Serial.list()
should be your Arduino. If not, uncomment the next
line by deleting the // before it, and re-run the
sketch to see a list of serial ports. Then, change
the 0 in between [ and ] to the number of the port
that your Arduino is connected to.
connect to Arduino
Build a colour based on the 3 values
Prepare a string to be sent to Arduino
write the colour string to the screen
this turns 1023 into 100
send data to Arduino
check if there is data waiting
read one byte
if byte is not newline
just add it to the buffer
newline reached, let's process the data
make sure there is enough data
chop off the last character, it's a carriage return
(a carriage return is the character at the end of a
line of text)
turn the buffer from string into an integer number
clean the buffer for the next read cycle
We're likely falling behind in taking readings
from Arduino. So let's clear the backlog of
incoming sensor readings so the next reading is
up-to-date.
we use these strings to parse the feed
zero the counters
An object to represent the URL
prepare a connection
now connect to the Website
this is a bit of virtual plumbing as we connect
the data coming from the connection to a buffered
reader that reads the data one line at a time.
read each line from the feed
break it down
each chunk of data is made lowercase
found "love"?
increment love by 1
found "peace"?
increment peace by 1
found "arduino"?
increment arduino by 1
Set 64 to be the maximum number of references we care about.
multiply by 4 so that the max is 255,
which comes in handy when building a
colour that is made of 4 bytes (ARGB)
If there was an error, stop the sketch