Vishay output interpreter

Hello forum goers,

I’m trying to create a code to interpret the output of a Vishay receiver. i.e. code that measures the length of a pulse (but I don’t want to use PulseIn). I initially wrote a big long code that would interpret it all for me, but I’m having trouble making it go into the interrupt so I reduced my code down to:

#include <avr/io.h>
#include <avr/interrupt.h>


void setup()
pinMode(8, INPUT);

TCCR1A = 0x00; //not using PWM
TCCR1B = 0x01; //no prescaling
TIMSK1 = _BV(ICIE1); // enable input capture interrupt

void loop()
delay(100); //so we’re not overwhelmed with values

So that all I’m trying to do is get the program to enter the interrupt and print “G” (I know, I know, shouldn’t print from an interrupt) at the moment. Does this seem right? It’s only printing me a line of Ls, not a G in sight.
I’m testing it with a 2Hz, 5 V peak to peak square wave signal.

Thanks in advance! I’ve only just started using Arduino.

Pins 2 & 3 are the hardware interrupt pins, you attach an interrupt to them. I don't see that happening with your code (but I'm not much into the register stuff either). What is pin 8 supposed to be doing?

Here's a collection of the bits I used in an RF remote control - push a button, create an interrupt.

// *  Name:        pin2Interrupt, "ISR" to run when interrupted in Sleep Mode
void pin2Interrupt()
  g_flag = 1;
byte g_flag;

void setup() {
  pinMode(pin2, INPUT);                 // our sleep interrupt pin
  digitalWrite(pin2, HIGH);            //enable internal pullup resistor - pin going low causes interrup
  attachInterrupt(0, pin2Interrupt, LOW);  // ready to be interrupted
void loop(){

If (g_flag == 0){
Serial.print ('L');
else {
detachInterrupt(0);                 //disable interrupts while printing
Serial.print ('G');
g_flag = 0;   // reset the interrupt flag
 attachInterrupt(0, pin2Interrupt, LOW);   // ready for next interrupt

If you can get that working, then you will see a G on each rising edge. Next you can change it to have the ISR be g_flag = 1-g_flag; and not clear g_flag with the serialprint, but hold it, and let the state will change in the interrupt 1-0-1-0 with each edge.

Then, add stuff to capture the time when the g_flag changes.