time delay for sensors

[borex_kun]

Hello there! I am a newbie when it comes to this kind of technology. Currently, I am building my project which is a 2-way traffic light for road construction purpose. Both roads have 1 ultrasonic sensor each for detecting which side would have a go and stop signal, which has 15 seconds(3mins actual) delay for switching lights, but I kinda want it to have a 5 seconds delay for the lights to switch if the green side has already all cars left while the red side has many vehicles queuing. I would be glad to hear some response

[system]

Difficult to figure out the thought process that put this question in "website and forum"

Moved

[Blackfin]

Study up on state machines. Sounds like a project ripe for one.

[TomGeorge]

Hi,
Welcome to the forum.

Please read the first post in any forum entitled how to use this forum.
http://forum.arduino.cc/index.php/topic,148850.0.html . Then look down to item #7 about how to post your code.
It will be formatted in a scrolling window that makes it easier to read.

Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?

Show us what code you have working and we can advise on how to go about modifying your code.

Thanks.. Tom...

[borex_kun]

Here it is sir.

#define trigPin 11
#define echoPin 12
#define Gled 13
#define Rled 6
#define trigPin2 2
#define echoPin2 3
#define Gled2 7
#define Rled2 5
const int switchDelay = 20000;
const int vehicleDelay = 10000;
unsigned long PreviousMillis = 0;         
unsigned long CurrentMillis;
void sensorLoop(){
  long duration, distance, duration2, distance2;
  digitalWrite(trigPin, LOW);
  digitalWrite(trigPin2, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  digitalWrite(trigPin2, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  digitalWrite(trigPin2, LOW);
  duration = pulseIn(echoPin, HIGH);
  duration2 = pulseIn(echoPin2, HIGH);
  distance = (duration/2)/29.1;
  distance2 = (duration2/2)/29.1;
  CurrentMillis = millis();               

if (distance <= 5 ){
  TL_Seq_1();
  }
  else if (distance > 5 && CurrentMillis - PreviousMillis == vehicleDelay){
    TL_Seq_2();
  }
  else{
    TL_OFF();
  }
  delay (1000);
  if (distance2 <= 5 ){
  TL_Seq_2();
  }
  else if (distance2 > 5 && CurrentMillis - PreviousMillis == vehicleDelay){
    TL_Seq_1();
  }
  else{
    TL_OFF();
  }
  delay(500);
  //return loop();
}
void TL_Seq_1(){
    digitalWrite(Gled, HIGH);
    digitalWrite(Rled2, HIGH);
    digitalWrite(Gled2, LOW);
    digitalWrite(Rled, LOW);
    switchDelay;  
}
void TL_Seq_2(){
    digitalWrite(Gled, LOW);
    digitalWrite(Rled2, LOW);
    digitalWrite(Gled2, HIGH);
    digitalWrite(Rled, HIGH);
    switchDelay;
}
void TL_OFF(){
    digitalWrite(Gled, LOW);
    digitalWrite(Rled2, LOW);
    digitalWrite(Gled2, LOW);
    digitalWrite(Rled, LOW);
}

void setup()
{ 
Serial.begin (9600);
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
pinMode(Gled, OUTPUT);
pinMode(trigPin2, OUTPUT);
pinMode(echoPin2, INPUT);
pinMode(Gled2, OUTPUT);
pinMode(Rled, OUTPUT);
pinMode(Rled2, OUTPUT);
}
void loop()
{ 
 sensorLoop();
}

TL_Project.ino (1.9 KB)

[system]

Please read reply #3

[borex_kun]

Please do check it if it's okay already sir.

[TomGeorge]

Hi,
OPs diagram.

Tom..