Kushagra Keshari
Published © CC BY-NC-ND

Simple Automated Point to Point Model Railroad

A basic point to point model railroad layout ideal for trams, light rail, powered cars, and metro trains.

IntermediateFull instructions provided2 hours2,492
Simple Automated Point to Point Model Railroad

Things used in this project

Hardware components

Arduino UNO & Genuino UNO
Arduino UNO & Genuino UNO
×1
Dual H-Bridge motor drivers L298
SparkFun Dual H-Bridge motor drivers L298
×1
Male/Female Jumper Wires
Male/Female Jumper Wires
×9
Jumper wires (generic)
Jumper wires (generic)
×4
IR proximity sensor
You can use any IR proximity sensor as long as it can be used as required in the project.
×2
Adafruit 12-volt 5A power supply adapter
Use this for larger layouts.
×1
Adafruit 12-volt 1A power supply adapter
Use this for smaller layouts.
×1

Story

Read more

Code

Simple_automated_point_to_point_layout.ino

Arduino
/*
 * Arduino program to control a model train running a point to point layout with the help of feedback sensors.
 * 
 * Made by Tech Build: https://www.youtube.com/channel/UCNy7DyfhSD9jsQEgNwETp9g?sub_confirmation=1
 * 
 * Feel free to tinker with the code and customize it for your own layout. :)
 */
int s;

int ta = 2;//Ineger variable to store time delay of the train between crossing the 'sensored' track and stopping at point A.

int tb = 2;//Ineger variable to store time delay of the train between crossing the 'sensored' track and stopping at point B.

int sa = 5;//Integer variable to store how long will the train stop at station A(in seconds).

int sb = 5;//Integer variable to store how long will the train stop at station B(in seconds).

int MidSpeed = 70;//Integer variable to store the train's initial speed(when leaving or arriving at the station).

int MaxSpeed = 110;//Integer variable to store the train's maximum speed(after leaving the station).


void motor_go(){
 if(s>=1&&s<=255){
  digitalWrite(9,LOW);
  digitalWrite(8,HIGH);
  analogWrite(10,s);
 }
 if(s<=-1&&s>=-255){
  digitalWrite(8,LOW);
  digitalWrite(9,HIGH);
  analogWrite(10,-s);
 }
 if(s==0){
  digitalWrite(9,LOW);
  digitalWrite(8,LOW);
  analogWrite(10,s);
 }
}
void setup() {
  // put your setup code here, to run once:
  pinMode(10,OUTPUT);
  pinMode(9,OUTPUT);
  pinMode(8,OUTPUT);
  pinMode(A0, INPUT);
  pinMode(A1, INPUT);
}

void loop() {
      /*
       * The train will start from point A to proceed towards point B.
       */
      for(s=0;s<=30;s++){//Applying low-voltage across the track rails to make the train's lights turn on(This might not work for all trains!).
        motor_go();
        delay(60);
      }

      delay(1000);//Waiting for a second.

      for(s=s;s<=MidSpeed;s++){//Starting the train from the station at point A.
        motor_go();
        delay(125);
      }

      while(digitalRead(A0)!=HIGH);//The train will keep moving at the set 'MidSpeed' until crossing the 'sensored' track.

      for(s=s;s<=MaxSpeed;s++){//Increasing the speed of the train.
        motor_go();
        delay(125);
      }

      while(digitalRead(A1)!=HIGH);//The train will keep moving at the set 'MaxSpeed' until crossing the next 'sensored' track.

      for(s=s;s!=MidSpeed;s--){//Reducing the speed of the train.
        motor_go();
        delay(125);
      }

      delay(tb*1000);//Wait for set amount of time(in seconds) before stopping the train at the station at point B.

      for(s=s;s!=30;s--){//Bring it to a halt, keeping the lights turned on(This might not work for all trains!).
        motor_go();
        delay(125);
      }

      delay(1000);//Wait for a second.

      for(s=s;s!=0;s--){
        motor_go();
        delay(60);
      }

      delay(5000);//Wait for set amount of time at the station before startinf again. 
      /*
       * The train will now start to go back to point A the same way it went from ppint A to B.
       */
      for(s=s;s!=-30;s--){
        motor_go();
        delay(60);
      }

      delay(1000);

      for(s=s;s!=-MidSpeed;s--){
        motor_go();
        delay(125);
      }

      while(digitalRead(A1)!=HIGH);

      for(s=s;s!=-MaxSpeed;s--){
        motor_go();
        delay(125);
      }

      while(digitalRead(A0)!=HIGH);

      for(s=s;s<=-MidSpeed;s++){
        motor_go();
        delay(125);
      }

      delay(ta*1000);

      for(s=s;s<=-30;s++){
        motor_go();
        delay(125);
      }

      delay(1000);

      for(s=s;s<=0;s++){
        motor_go();
        delay(60);
      }

      delay(5000);
      
}

Credits

Kushagra Keshari

Kushagra Keshari

14 projects • 28 followers
A casual electronics and a model railway hobbyist.

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