Objective of this project:
There are barriers between a railroad train and a pedestrian or car crossing.
In this project we will realize a system that simulate the operation of automatic barriers for railways trains.
We will design this system using:
- Arduino UNO
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two ultrasonic sensors hc-sr04 for the detection of the arrival of the train.
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two servomotors to lower or raise the barriers
Operation of the barrier controlled by Arduino:
Components required
- Arduino UNO
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HC-SR04 sensor
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Supply power module
- LEDs
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test plate
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connecting wires
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toy train
Mounting:
To do the assembly, we connected:
For the first sound sensor HC-SR04:
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the VCC pin to the 3.3V pin of the Arduino
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the Trig pin to pin 3 of the Arduino
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the ECHO pin to pin 4 of the Arduino
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the GND pin to the GND pin of the Arduino
For the second sound sensor HC-SR04:
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the VCC pin to the 3.3V pin of the Arduino
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the Trig pin to pin 8 of the Arduino
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the ECHO pin to pin 9 of the Arduino
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the GND pin to the GND pin of the Arduino
For the first servomotor:
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red wire: power supply wire to be connected to the 5V terminal of the power supply module
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brown wire: wire to connect to the GND pin of the Arduino
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Yellow: Positioning signal wire connected to pin 3 of the Arduino
For the second servomotor:
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red wire: power supply wire to be connected to the 5V terminal of the power supply module
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brown wire: wire to connect to the GND pin of the Arduino
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Yellow: Positioning signal wire connected to pin 7 of the Arduino
For LEDs:
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the terminals (-) of the LEDs to GND of the Arduino
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the (+) terminal of the first red LED to pin 2 of the Arduino
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the (+) terminal of the second red LED to pin 7 of the Arduino
Arduino program:
Here are the micropython programs that allow you to:
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calculate the distance between the HC-SR04 sensor and the detected object
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raise or lower barriers
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turn LEDs on or off
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#include <HCSR04.h> #include <Servo.h> Servo monServomoteur1; Servo monServomoteur2; const int LED1=2; const int servo1Pin=3; const int trig1Pin = 4; const int echo1Pin = 5; const int LED2=6; const int servo2Pin=7; const int trig2Pin = 8; const int echo2Pin = 9; int position1 = 90; int position2=90; // initialisation du 1er capteur avec les broches utilisees. UltraSonicDistanceSensor distanceSensor1(trig1Pin, echo1Pin); // initialisation du 2eme capteur avec les broches utilisees. UltraSonicDistanceSensor distanceSensor2(trig2Pin, echo2Pin); void setup(){ monServomoteur1.attach(servo1Pin); monServomoteur2.attach(servo2Pin); pinMode(LED1,OUTPUT); //règle la borne numérique numéro 7 de la carte Arduino en mode sortie pinMode(LED2,OUTPUT); //règle la borne numérique numéro 8 de la carte Arduino en mode sortie } void loop(){ if((((distanceSensor1.measureDistanceCm()+1)<6)&&(distanceSensor1.measureDistanceCm()+1)>0)) {// If the hc-sr04 sensor detects the arrival of the train digitalWrite(LED1,HIGH); // Turn on the red LED while (position1>0){ monServomoteur1.write(position1); // lower the barrier position1--; delay(10); } }else { digitalWrite(LED1,LOW); // Turn off the red LED while (position1<90){ monServomoteur1.write(position1); // raise the barrier position1++; delay(10); } } if((((distanceSensor2.measureDistanceCm()+1)<6)&&(distanceSensor2.measureDistanceCm()+1)>0)) {// If the hc-sr04 sensor detects the arrival of the train digitalWrite(LED2,HIGH); // Turn on the red LED while (position2>0){ monServomoteur2.write(position2); // lower the barrier position2--; delay(10); } }else { digitalWrite(LED2,LOW); // Turn off the red LED while (position2<90){ monServomoteur2.write(position2); // raise the barrier position2++; delay(10); } } } |
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