DIY RC switch for my quad lights - India's open forum for RC flying, aeromodelling, cars and hobby stores

I have been planning to light up my quad for a while now. I received LED strips from quadkopters.com yesterday along with a JST harness. The LEDs are impressively bright. I need to rebuild my quad first and check if it flies but meanwhile I have been working on a RC switch for these lights. I was planning to go for a modded servo board but I have a free 3 position switch on my radio so I thought "Why not add a strobe feature too?". I have made the initial prototype, using Arduino. I plan to port it to Attiny to save space. I am using a TIP31C transistor to drive the 12V LEDs. I will be powering the LEDs either from the main battery or a separate one (my plane battery). The circuit will require a common ground so I will have to figure out how to implement that (maybe using the BAT port) with an LM7805 to power the Attiny.
Here is my code (my programming knowledge is very little. This code was made by cobbling together the Blink program as well as a program to read the PWM signals from the receiver by Nick Poole.):
/*
RC PulseIn Joystick
By: Nick Poole
SparkFun Electronics
Date: 5
License: CC-BY SA 3.0 - Creative commons share-alike 3.0
*/

int ch1;
int led = 13;
void setup() {

  pinMode(5, INPUT); // Set our input pins as such
  pinMode(led, OUTPUT);

  Serial.begin(9600); // Pour a bowl of Serial

}

void loop() {

  ch1 = pulseIn(5, HIGH, 25000); // Read the pulse width of
  Serial.print("Switch:"); // Ch2 was y-axis
  Serial.println(map(ch1, 1000,2000,-500,500)); // center at 0

  {
   if(map(ch1, 1000,2000,-500,500)<-25){
   Serial.println("Lights Off");
   digitalWrite(led, LOW);
   };
   {
   if(map(ch1, 1000,2000,-500,500)>-25 && map(ch1, 1000,2000,-500,500)<0){
   Serial.println("Lights On");
   digitalWrite(led, HIGH);
   };
   {
   if(map(ch1, 1000,2000,-500,500)>10){
   Serial.println("Lights Blink");
   digitalWrite(led, HIGH); // turn the LED on (HIGH is the voltage level)
   delay(50); // wait for a second
   digitalWrite(led, LOW); // turn the LED off by making the voltage LOW
   delay(50); // wait for a second
   };

   delay(1000);// I put this here just to make the terminal
   // window neater
   }

   }
  }
}

Printing to the Serial monitor is unnecessary. It just makes reference easier. I would appreciate any tips, suggestions or advice.