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Outcome

Intention

My roommates and I both commute to school by bus every day especially in winter. When we missed a bus, we got frustrated because we would need to wait for the next one or walk to school. Normally I use the app Transit to check the real-time bus schedule, but my eyes need to fixate on the screen the whole time when I am eating breakfast and getting ready for school. Therefore, I wanted to create a light IoT device to help me plan my morning more smoothly.

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Goal

My IoT device, BusAlert, has one knock sensor and 3 LED with different colors. Once the sensor is triggered, the light will lit up according to the estimated arrival time of a certain bus - in my case, it's the number 54 bus. For example, if the bus is more than 10 minutes away, the Green LED will light up; if less than 10 minutes but more than 5, the Blue will light up; if less than 5 minutes but more than 3 minutes, the Red; if less than 3 minutes, the Red will blink.

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Process

1. Brainstorm

2. Build a Simple LED Circut

3. Test the Knock Sensor

4. Create for Port Authority Webhook

5. Embed Code

6. Test Retrieved Data with Publish Variable

7. Connect Sensor

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int ledPinRed = D3;
int ledPinGreen = D4;
int ledPinYellow = D2;
int knockSensor = A0;
bool state = false;

int timeToBus = 0;


void setup() {
    //initial state of all 3 pins
    pinMode(ledPinRed, OUTPUT);
    digitalWrite(ledPinRed, LOW);
    
    pinMode(ledPinGreen, OUTPUT);
    digitalWrite(ledPinGreen, LOW);
    
    pinMode(ledPinYellow, OUTPUT);
    digitalWrite(ledPinYellow, LOW);
    
    //Port Authority webhook
    Particle.subscribe("hook-response/bustime", myBusTimeHandler, MY_DEVICES);
    
    //view variable value in console
    Particle.variable("timeToBus", timeToBus);
}

void loop() {
    //read sensor
    int sensorReading = analogRead(knockSensor);
  
    //change state when sensor is pressed
    if (sensorReading > 100){
        state = !state;
    }
    
    //if sensor is pressed, lights respond to the bus time
     if( state == true )
     {
            Particle.publish( "bustime" );
            delay( 1000 );
            if(timeToBus > 10) 
            {
                digitalWrite(ledPinGreen, HIGH);
                digitalWrite(ledPinRed, LOW);
                digitalWrite(ledPinYellow, LOW);
            }
            else if(timeToBus <= 10 && timeToBus > 5) 
            {
                digitalWrite(ledPinYellow, HIGH);
                digitalWrite(ledPinRed, LOW);
                digitalWrite(ledPinGreen, LOW);
            } 
            else if(timeToBus <= 5 && timeToBus > 3) 
            {
                digitalWrite(ledPinRed, HIGH);
                digitalWrite(ledPinYellow, LOW);
                digitalWrite(ledPinGreen, LOW);
            } 
            else if(timeToBus <= 3) 
            {
                digitalWrite(ledPinRed, HIGH);
                delay(100);
                digitalWrite(ledPinRed, LOW);
                delay(100);
            }
     }
    else //if sensor is pressed again, state changes to false, lights turn off
    {
        digitalWrite(ledPinYellow, LOW);
        digitalWrite(ledPinRed, LOW);
        digitalWrite(ledPinGreen, LOW);
    }
     
}


//method for Port Authority webhook
void myBusTimeHandler(const char *event, const char *data) {
    
    // Handle the integration respo
    String busPrediction = String( data );
    
    if( busPrediction.equals( "DUE" ) ){
        timeToBus = 0;
    }else{
        timeToBus = busPrediction.toInt();
    }
}

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