Group 21- Parking Sensor

A parking sensor that can let drivers know when a parking lot is full or has vacancies.

IntermediateFull instructions provided8 hours150

Things used in this project

Hardware components

Particle Argon

LED (generic)

Jumper wires (generic)

Ultrasonic Sensor - HC-SR04 (Generic)

Software apps and online services

Particle Build Web IDE

Story

Downtown is a place full of cars and traffic and has tons of parking, both above ground and underground. For our project we decided to build a parking sensor using an ultra sonic sensor as well as two LED indicator sensors. The reasoning behind this decision was to find a way to make parking in downtown city areas easier. This project is designed to be used in a wide scale of places such as high rise parking decks as well as underground parking decks. The first argon is used as the "parking lot" and the "parking meter", and the second argon is used as the "home base". At the first argon, the ultra sonic sensor gives a signal to the "home base" when is senses a car parked in the space. When the car is parked within a specified distance range, an LED will turn on in the "home base" to indicate that the spot is being taken up. Once the signal reaches "home base", it will communicate back to the original argon by sending another signal to the "parking meter". The red LED will then be lit, and indicates to the driver that they need to pay before leaving.

PICTURES:

1 / 7 • Side View of the Parking Lot

COMMUNICATIONS FLOW CHART:

LIVE UPDATE GRAPH:

Code

double in;
bool parkingAvailable;
long duration;

int timerLED = D2;
int trigPin = D6;
int echoPin = D7;

void setup() 
{
    pinMode(timerLED, OUTPUT);
    pinMode(trigPin, OUTPUT);
    pinMode(echoPin, INPUT);
    Particle.subscribe("parkingJob", timeLimit);
}

void loop() 
{
    digitalWrite(trigPin, HIGH);
    delayMicroseconds(1000);
    digitalWrite(trigPin, LOW);
    duration = pulseIn(echoPin, HIGH);
    in = (duration/2)/74;
    Serial.print(in);
    Serial.println("inches");
    delay(200);
    // check if there is a car parked
    if (in <= 10){
        Particle.publish("unavailable", String(parkingAvailable));
        parkingAvailable = false;   
        Serial.println("unavailable");
    }
    else if (in >= 10){
        Particle.publish("available", String(parkingAvailable));
        parkingAvailable = true;   
        Serial.println("available");
    }
    delay(1000);
}
//receive notice from "home base" argon to light the parking lot LED
void timeLimit(const char *event, const char *data){
   
    if (parkingAvailable == false){
        digitalWrite(timerLED, HIGH);
    }
    else if (parkingAvailable == true){
        digitalWrite(timerLED, LOW);
    }
    else {
        digitalWrite(timerLED, LOW);
    }
    
}

int led1 = D7; 
bool complete;

void setup() {
 pinMode(led1, OUTPUT);
 Particle.subscribe("unavailable", ledOn);
 Particle.subscribe("available", ledOff);
}

void loop() {

}
//if the first argon senses a car parked in the lot, it will send a signal to the "home base" to notify them that a car is parked there. Once they receive the signal, it will send another signal back to notify the driver to pay their parking lot fare.
void ledOn(const char *event, const char *data) {
    digitalWrite(led1, HIGH);
    complete = true;
    Particle.publish("parkingJob", String(complete));
}
void ledOff(const char *event, const char *data) {
    digitalWrite(led1, LOW);
    complete = true;
    Particle.publish("parkingJob", String(complete));
}