Question

Replace the todo comments with the right code.


//Create variables to use later
const int TRIG_PIN = 9; 
const int ECHO_PIN = 10;

const int RED_PIN = 3;
const int GREEN_PIN = 5;
const int BLUE_PIN = 6;

float duration, distance_in_cm, distance_in_feet;

void setup()
{
   //Setup pins for correct I/O
   pinMode(TRIG_PIN, OUTPUT); 
   pinMode(ECHO_PIN, INPUT); 

   pinMode(RED_PIN, OUTPUT); 
   pinMode(GREEN_PIN, OUTPUT); 
   pinMode(BLUE_PIN, OUTPUT); 
}

void loop()
{
   //Generate the ultrasonic waves
   digitalWrite(TRIG_PIN, LOW); 
   delayMicroseconds(2); 
   digitalWrite(TRIG_PIN, HIGH); 
   delayMicroseconds(10); 
   digitalWrite(TRIG_PIN, LOW);

   //Read in the echoed waves
   duration = pulseIn(ECHO_PIN, HIGH);

   //Convert from time to distance using the speed of sound
   distance_in_cm = (duration*.0343)/2;

   //TODO: Convert distance_in_cm to distance_in_feet

   //TODO: Replace distance_in_cm with distance_in_feet below  
   //and update the comparison distances for appropriate social distancing
   if(distance_in_cm > 50){        //safe distance
      setColor(0, 255, 0);
   }else if(distance_in_cm > 25){  //getting a bit close now are we...
      setColor(255, 255, 0); 
   }else if(distance_in_cm > 5){   //stay back!
      setColor(255, 0, 0);
   }
}

void setColor(int redValue, int greenValue, int blueValue){
   analogWrite(RED_PIN, redValue);
   analogWrite(GREEN_PIN, greenValue);
   analogWrite(BLUE_PIN, blueValue); 
}

Answer 1

//Create variables to use later
const int TRIG_PIN = 9; 
const int ECHO_PIN = 10;

const int RED_PIN = 3;
const int GREEN_PIN = 5;
const int BLUE_PIN = 6;

float duration, distance_in_cm, distance_in_feet;

void setup()
{
   //Setup pins for correct I/O
   pinMode(TRIG_PIN, OUTPUT); 
   pinMode(ECHO_PIN, INPUT); 

   pinMode(RED_PIN, OUTPUT); 
   pinMode(GREEN_PIN, OUTPUT); 
   pinMode(BLUE_PIN, OUTPUT); 
}

void loop()
{
   //Generate the ultrasonic waves
   digitalWrite(TRIG_PIN, LOW); 
   delayMicroseconds(2); 
   digitalWrite(TRIG_PIN, HIGH); 
   delayMicroseconds(10); 
   digitalWrite(TRIG_PIN, LOW);

   //Read in the echoed waves
   duration = pulseIn(ECHO_PIN, HIGH);

   //Convert from time to distance using the speed of sound
   distance_in_cm = (duration*.0343)/2;

   //TODO(DONE in bellow): Convert distance_in_cm to distance_in_feet
   distance_in_feet = distance_in_cm / 30.48;

   //TODO(DONE in bellow): Replace distance_in_cm with distance_in_feet below  //
   //and update the comparison distances for appropriate social distancing
   if(distance_in_feet > 50){        //safe distance
      setColor(0, 255, 0);
   }else if(distance_in_feet > 25){  //getting a bit close now are we...
      setColor(255, 255, 0); 
   }else if(distance_in_feet > 5){   //stay back!
      setColor(255, 0, 0);
   }
}

void setColor(int redValue, int greenValue, int blueValue){
   analogWrite(RED_PIN, redValue);
   analogWrite(GREEN_PIN, greenValue);
   analogWrite(BLUE_PIN, blueValue); 
}