//assigning each pin a name to make it easier for both use in the program, and change the pin used in the future
// using const unsigned char as this counts 0-255 and has a storage value of 1 byte, const so they are read-only

const unsigned char senAA1 = 05
const unsigned char senAA2 = 06
const unsigned char senAB1 = 07
const unsigned char senAB2 = 08
const unsigned char senBB1 = 09
const unsigned char senBB2 = 10
const unsigned char relOut1 = 15

void setup() {

//declaring whether the pins used are input or output

	pinMode(senAA1, INPUT);
	pinMode(senAA2, INPUT);
	pinMode(senAB1, INPUT);
	pinMode(senAB2, INPUT);
	pinMode(senBB1, INPUT);
	pinMode(senBB2, INPUT);
	pinMode(relOut1, OUTPUT);

//creating variables and assigning the initial values for total axles in and total axles out
//also creating a variable for the total number of axles

unsigned char nIn = 0;
unsigned char nOut = 0;
unsigned char nTotal = nIn - nOut;

}

void loop() {

//Route AA
label1

	if (digitalRead(senAA1) == HIGH)
	{
		if (digitalRead(senAA2) == HIGH)
		{
			//add one axle to the In counter
			++nIn;
			//do nothing whilst AA2 is still high
			while(digitalRead(senAA2) == HIGH);
		}
		else
		}
			++nOut;
		{
	}

//Route AB

	if (digitalRead(senAB1) == HIGH)
	{
		if (digitalRead(senAB2) == HIGH)
		{
			++nIn;
			while(digitalRead(senAB2) == HIGH);
		}
		else
		}
			++nOut;
		{
	}

//Route BB

	if (digitalRead(senBB1) == HIGH)
	{
		if (digitalRead(senBB2) == HIGH)
		{
			++nIn;
			while(digitalRead(senBB2) == HIGH);
		}
		else
		}
			++nOut;
		{
	}

//Relay output HIGH if a train in section, LOW if not

	if (ntotal == 0;)
	{
		digitalWrite(relOut1, HIGH);
	}
	else
	{
		digitalWrite(relOut1, LOW);
	}
}