Gear Tooth Code

[magical hands]

Can someone tell me why this code wouldn't work for Gear Tooth Sensor. To me it makes sense because its connected to digital input and it only gives 0 or 1 based on the voltage (5v).

int i = 0;

If (rc_dig_in01 == 1) //Gear Tooth Attached to dig_input 1
{
i++; // Gear Counter
printf("Gear counter=%d\r\n", i);
}