#include <Stepper.h>
const int stepsPerRevolution = 200;
Stepper myStepper(stepsPerRevolution, 4, 5, 6, 7);
int motorPin = 3;
const int trigPin = 9; //bottom black
const int echoPin = 10;
const int trigPin2 = 11; //top white
const int echoPin2 = 12;
float duration;
float distance;
float duration2;
float distance2;
float ratio;


void setup()
{
pinMode(motorPin, OUTPUT);
myStepper.setSpeed(140);
Serial.begin(9600);
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
Serial.begin(9600);
pinMode(trigPin2, OUTPUT);
pinMode(echoPin2, INPUT);
Serial.begin(9600);
}


void loop()
{
 
digitalWrite(motorPin, HIGH); //vibrate
myStepper.step(-35*stepsPerRevolution);


delay(20000);
myStepper.step(35*stepsPerRevolution);
digitalWrite(motorPin, LOW);  //stop vibrating
delay(1000);
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
distance = (duration * 0.034 / 2);
Serial.print("Dust Measurement: ");
Serial.println(distance);
digitalWrite(trigPin2, LOW);
delayMicroseconds(2);
digitalWrite(trigPin2, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin2, LOW);
duration2 = pulseIn(echoPin2, HIGH);
distance2 = (duration2 * 0.034 / 2);
Serial.print("grain measurement: ");
Serial.println(distance2);
ratio=distance2/distance;
Serial.print("ratio: ");
Serial.println(ratio);
if (ratio>0.95)
Serial.println("EXCESSIVE DUST");
else
Serial.println("NORMAL");
delay(1000);
}