#include <SoftwareSerial.h>
#include <avr/io.h>
#define f_CPU 20000000

#define TX PA1
//#define RX PA0
#define RX PA5

SoftwareSerial Serial(RX, TX);

void setup()
{
 pinMode(PA7,OUTPUT);  
 Serial.begin(9600);
 //int filter=0;
digitalWrite(PA7,HIGH);
}
void loop()
{
  if (Serial.available()>0)
{
  //int eps=0.5;
int low=Serial.read();
int high=Serial.read();
//int value = (256*high) + low;
//if (value > 511)
  //    value -= 1024;
//int V = 2.5 - value*5.0/(20.0*512.0);
//int R = 10000.0/(5.0/V-1.0);
//int B = 3750.0;
//int R25 =  10000.0;
//int T = 1.0/(log(R/R25)/B+(1/(22.0+273.15))) - 273.15;
//int filter = (1-eps)*filter + eps*T;

//Serial.print(filter);

if (low<170)             
{
digitalWrite(PA7,LOW);
delay(200); 
digitalWrite(PA7,HIGH);
delay(200); 
digitalWrite(PA7,LOW);
delay(200); 
digitalWrite(PA7,HIGH);
delay(200); 
digitalWrite(PA7,LOW);
delay(200); 
}
}
}