HeHe… yeah, this is a UK torch… we would call a US Torch a Blow Torch or Blow Lamp… that mean anything in the States? 
OK… with your kind help I now have the sketch below successfully picking up the LED pulse, albeit with a different sensor
I think the last hurdle to jump is amalgamating this test sketch with the original and I should be there? CRS8291 has his sensor on Digital Pin 3 but I cannot see how its done?
The IR sensor is connected to digital pin 3 and is declared in the attachInterrupt statement:
attachInterrupt(1, wattSensorInterrupt, FALLING); //interrupt1 - digital pin 3 - If we detect a change from HIGH to LOW we call wattSensorInterrupt
My working test code is below, I have the sensor on analog pin 1 with a threshold value… how would I transpose this into the Stalker code? (shown right at the bottom).
Sorry, I am slowly learning with much help it is certainly appreciated.
Working code for sensor on analog pin 1
int ledPin = 13; // LED connected to digital pin 13
int sensorPin = 1; // SFH203FA connected to analog pin 1
int sensorState = 0;
// The setup() method runs once, when the sketch starts
void setup() {
// initialize the digital pin as an output:
pinMode(ledPin, OUTPUT);
pinMode(sensorPin, INPUT);
Serial.begin(9600);
}
// the loop() method runs over and over again,
// as long as the Arduino has power
void loop(){
// read the state of the sensor value:
sensorState = analogRead(sensorPin);
// check if the sensor is receiving IR.
// if it is, the ledState is HIGH - have guessed a theshhold value of 100?
if (sensorState > 100) {
// turn LED on:
digitalWrite(ledPin, HIGH);
}
else {
// turn LED off:
digitalWrite(ledPin, LOW);
}
Serial.println(sensorState);
}
CRS8291’s Stalker code using sensor on digital pin 3:
//Meter reading program using Itron smart meter
//Added LED that turns on/off with each watt
#include "FileLogger.h" // http://code.google.com/p/arduino-filelogger/
#include <Time.h>
#include <Wire.h>
#include <DS1307RTC.h> // a basic DS1307 library - http://www.arduino.cc/playground/Code/Time
const int ledPin = 14; // LED watt indicator initialization. Turns on or off each time a watt is measured
int ledState = LOW;
volatile unsigned long wattSensor=0; //Counts power pulses in interrupt, 1 pulse = 1 watt
unsigned long wattSensorTemp=0; //Temporary power pulse counts for printing - watts
unsigned long totalWatts=0; //Temporary total power used for printing - watts
byte start[7]= {
'B','e','g','i','n',0x0D,0x0A};
byte Buffer[31]; //Buffer for printing to SD card
time_t oldtime=0; //last time loop has ran
int result; //status of SD card write - 0 = "OK", 1 = "Fail initializing", 2 = "Fail appending"
unsigned long loggingRate=5; //logging rate in seconds
int length; //length of buffer string
void setup(void)
{
pinMode(ledPin, OUTPUT); // LED watt indicator initialization
attachInterrupt(1, wattSensorInterrupt, FALLING); //interrupt1 - digital pin 3 - If we detect a change from HIGH to LOW we call wattSensorInterrupt
do
{
result = FileLogger::append("data.txt", start, 7);//Initialize the SD Card
}
while(result != 0);
// the next two lines can be removed if the RTC has been set
// setTime(17,05,0,1,3,10); // set time to 17:05:00 1 Mar 2010
// RTC.set(now()); // set the RTC to the current time (set in the previous line)
// format for setting time - setTime(hr,min,sec,day,month,yr);
setSyncProvider(RTC.get); // the function to get the time from the RTC
Serial.begin(9600);
}
void loop(void)
{
time_t t = now();
// if(t >= oldtime + loggingRate) //proceed with loop if loggingRate seconds have elapsed
if( minute(t) != oldtime) //use this if 1 minute intervals is desired
{
wattSensorTemp=wattSensor; //number of watts for interval
wattSensor=0; //reset watts counter
totalWatts=totalWatts+wattSensorTemp; //total watts counter
oldtime = minute(t); //use this for one minute interval
//oldtime = t; //or this for loggingRate interval
do
{
Buffer[0]='A'; //start packet/Site ID
Buffer[1]=','; //start of data string
//format of printDigits - printDigits(tempBuffer,bufferPntr,numberDigits)
printDigits(t,2,10); //t = now()
Buffer[12]=',';
printDigits(wattSensorTemp,13,5); //wattSensorTemp
Buffer[18]=',';
printDigits(totalWatts,19,8); //totalWatts
Buffer[27]=',';
Buffer[28]='>'; //end data packet
Buffer[29]=0x0D;
Buffer[30]=0x0A;
length=sizeof(Buffer);
result = FileLogger::append("data.txt", Buffer, length);
}
while( result != 0);
for (int i=0; i < length ;i++) {
Serial.print(Buffer[i]); //Serial print buffer string to serial monitor or xBee
}
}
}
void wattSensorInterrupt() //Interrupt1 counter routine for counting watts
{
wattSensor=wattSensor+1; //Update number of pulses, 1 pulse = 1 watt
if (ledState == LOW) //Cycle LED on or off each time one watt is counted
ledState = HIGH;
else
ledState = LOW;
digitalWrite(ledPin, ledState);
}
void printDigits(unsigned long tempBuffer, int bufferPntr, int numberDigits) //assign data to output array
{
unsigned long modDivide = 1;
for (int i = 0; i < numberDigits; i++) {
Buffer[bufferPntr+numberDigits-1-i]=((tempBuffer%(modDivide*10))/modDivide)+'0';
modDivide=modDivide*10;
}
}