Hello so here is what i want to do :
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Motor should be off for 100 seconds.
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17 Seconds before Motor Turns on start something ( Code under here is not exactly what but it doesnt matter at this point.
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After the preroll stuff is done check the Ir sensor.
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If the ir sensor is false. make a Led high for 5 seconds and turn it off and then wait 15 seconds before trying again.
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if the ir sensor after lets say 3 attempts is true then turn on the motor for 3 seconds and restart the process.
hope i explained myself good enough, been grinding my head over this one. Thanks for help! 
const unsigned int Ontime = 3000; // How long the motor should stay on.
const unsigned long Offtime = 100000; // How Long the motor should stay off.
const unsigned long preroll = 17000; // How long time before motor turn on to give a warning sound.
const unsigned long waiting = 15000; // Wait time before it checks the Ir sensor again.
unsigned long previousMillis = 0; // will store last time.
bool motorState = true; //
int irSensorState = false;
void setup() {
pinMode(motorPin, OUTPUT);
Serial.begin(9600); //Start serial communication boud rate at 9600
pinMode(irSensor, INPUT); //Pin 5 as signal input
pinMode(ledPin, OUTPUT);
pinMode(ledPin2, OUTPUT);
pinMode(ledPin3, OUTPUT);
}
void loop() {
if(digitalRead(irSensor)==LOW) {
irSensorState = false;
// Collision detected.
}
else {
irSensorState = true;
// No collision detected.
}
if (Motorstate == false)
{
if (currentMillis - previousMillis >= (Offtime - preroll)) // start this 17 seconds before Ontime.
digitalWrite(Ledpin, HIGH);
}
// maybe here i want a code that check if the Ir sensor is either true or false,
//if its false i want to check it again in 15 seconds (( const unsigned long waiting = 15000;)
// and then do it every 15 seconds untill its true, and then Turn on the motor pin.
if (currentMillis - previousMillis >= Offtime)
{
previousMillis = currentMillis;
motorState = !motorState;
digitalWrite(motorPin, motorState);
}
}
else
{
if (currentMillis - previousMillis >= Ontime)
{
previousMillis = currentMillis;
motorState = !motorState;
digitalWrite(motorPin, motorState);
signalSent = false; // Set it back to false again to restart the proces
}
}
}
cant seem to figure it out. like with the timer and all, to check the ir sensor and go forward or not would be okay, but it is the timer thing im having some issues with