arduino based red color alarm for israeli missiles alert - a PoC video: http://youtu.be/AdF2AGIjtvY

ard_red.ino

int led = 13;
int in = 0;

void setup() {
  pinMode(led, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  if (Serial.available() == 0) {
    return;
  }

  in = Serial.read() - 48;
  Serial.print("I received: ");
  Serial.println(in, DEC);
  if (in == 1) {
    Serial.write("in == 1");
    digitalWrite(led, HIGH);
    delay(1500);
    digitalWrite(led,LOW);
    delay(100);
  } else {
    digitalWrite(led,LOW);
  }

}

ard_red.rb

#!/usr/bin/env ruby

require 'open-uri'
require 'json'
require 'serialport' # gem install serialport

PKR_URL  = 'http://www.oref.org.il/WarningMessages/alerts.json'
AREA_FMT = 'מרחב: %s, קוד מרחב: %s'
LOG_FMT  = '[%s] id: %s, %s'

def to_json 
  request = Time.now
  data = open(PKR_URL).read.force_encoding('utf-16').encode('utf-8')
  answer  = Time.now
  print "Took #{answer - request} time to retrive data "
  JSON.parse(data)
end

def exec
  log = open(File.expand_path(File.dirname(__FILE__), 'alarm2.log'), 'a+')
  serial = SerialPort.new('/dev/ttyACM3')
  serial.baud = 9600
  while true do
    json = to_json
    next if json['title'].strip == 'בדיקה'
    p json
    unless json['data'].empty? || json['data'].include?('בדיקה')
      # sometimes they break things :(
      if json['data'].length == 1 && json['data'].include?(',')
        json['data'] = json['data'][0].split(/,\s{0,}/)
      end
      json['data'].map! do |x|
        x =~ /^([\p{hebrew}\s]+[^\s])\s(\d+)$/
        x = AREA_FMT % [$1, $2] rescue x
      end
      list = json['data'].join(' | ')
      line = LOG_FMT % [Time.now.strftime('%D %T'), json['id'], list]
      puts line
      log.puts line
      serial.write(1)
    end

    log.flush
    sleep 1
  end

ensure
  log.close
  serial.close
end

exec

#job = fork do
#  exec
#end
#
#Process.detach(job)