Ping Web. Connect Ruby with Arduino by Serial Port

ping.rb

require 'serialport'
require 'net/ping'
 
website = 'http://turismoi.pek'
 
#this *will* be different for you
#You need to find out what port your arduino is on
#and also what the corresponding file is on /dev
#You can do this by looking at the bottom right of the Arduino
#environment which tells you what the path.
port_file = '/dev/tty.usbmodem1411'
 
#this must be same as the baud rate set on the Arduino
#with Serial.begin
baud_rate = 9600
 
data_bits = 8
stop_bits = 1
parity = SerialPort::NONE
 
#create a SerialPort object using each of the bits of information
port = SerialPort.new(port_file, baud_rate, data_bits, stop_bits, parity)
 
wait_time = 4
 
#for an infinite amount of time
loop do
  #lets us know that we've checked the unread messages
  puts "Ping #{website}"
  pingomatic = Net::Ping::HTTP.new(website)
 
  unless pingomatic.ping?
    port.write "b"
  end
 
  #wait before we make another request to the Gmail servers
  sleep wait_time
end

serial_ruby.ino

void setup() {
  Serial.begin(9600);
 
  //Set pin 11 to be output pin (connect LED here)
  pinMode(11, OUTPUT);
 
  //set pin 11 to be high initially; LED is usually on, but, not blinking
  digitalWrite(11, HIGH);
}
 
//this procedure is called if we need to blink the LED
void blink_led() {
 
  //we can't just blink it once, because that wouldn't be noticeable
  //so, we blink it three times
  for(int i = 0; i<10; i++) {
    digitalWrite(11, HIGH);
    delay(100);
    digitalWrite(11, LOW);
    delay(100);
  }
 
  //reset the LED back to just on, not blinking
  digitalWrite(11, HIGH);
}
 
//this function is called when we get a character
//over USB/Serial
void got_char(char x) {
 
  //if we get b over Serial
  if(x == 'b') {
    //... blink the LED
    blink_led();
  }
}
 
void loop() {
  //check if there's any data available on serial
  if(Serial.available() > 0) {
    //if there is, we read it
    byte byte_read = Serial.read();
 
    //and call "got_char"
    got_char((char)byte_read);
  }
}