Exploder Circuit

I am creating a circuit and program to receive a signal from a switch, wait a certain amount of time, then send a voltage out. This will be used to explode a balloon after some time to test the parachute. The signal will leave the Atmega 328 and go though a buffer operational amplifier, and into a relay which is connected to a solar igniter. The buffer is to separate the Atmega from relay and the solar igniter. The chip will not supply enough current to ignite the igniter, so a relay must be used.  The relay will supply current required to the solar igniter that will be attached to the balloon. Originally,a transistor was going to be used, but it leaked current and led to our igniter bursting before it was supposed to. The circuit was modified to contain a mechanical relay which worked, but the current draw through the mechanical relay was about 80 mA, which is high enough for concern (considering this is to be supplied by batteries while in flight). The final version (posted below), uses a solid state relay, which does not have current leakage problems and only draws 9 mA of current.

This circuit has been tested with an LED and a solar igniter at the output of the relay and works with both. The code used for the Atmega 328 is posted below. 

/*

 Balloon Exploder

 Standby: Repeatedly blinks an LED

 Recieves voltage at input, turns off standby

 Waits 5 seconds, then sends a HIGH out to 12 and 13(LED)

*/

void setup() {                

  // initialize the digital pin as an output.

  // Pin 13 has an LED connected

  pinMode(13, OUTPUT);    //pin 13 is set to an output

  pinMode(8, INPUT);      //pin 8 is set to an input

  pinMode(12, OUTPUT);    //pin 12 is set to output

  digitalWrite(12,LOW);   //pin 12 is initialized as low

}

void loop(){

  while(digitalRead(8)==LOW){   // while loop reads pin 8 and will stay in loop until pin 8 recieves 5 volts

    digitalWrite(13, HIGH);  //writes pin 13 to 5 volts

    delay(1000);             //waits a second

    digitalWrite(13, LOW);   //writes pin 13 to 0 volts

    delay(1000);             //watis a seconds

  }                          

  delay(5000);               // delays 5 seconds

  digitalWrite(13, HIGH);    //sets pin 13 to 5 volts

  digitalWrite(12, HIGH);    //sets pin 12 to 5 volts for transistor

  while(1==1);               //stays in this state until reset

}