RVLADChinmayPatel
Published © GPL3+

Ground Proximity Sensing with Ultrasonic Sensor

It is a miniature counterpart of radio altimeter used on commercial aircrafts to be used with RC aircrafts and multirotors.

BeginnerFull instructions provided7,018
Ground Proximity Sensing with Ultrasonic Sensor

Things used in this project

Story

Read more

Schematics

circuitDiagram

The fritzing drawing of circuit diagram

Code

stable_ultrasonic_blink.ino

Arduino
A code to sense rate of change of altitude of aircraft above ground in form of blinking of LED
int triggerpin=10;
int echopin=11;
long duration;
long distance;
long x;
long x1=45;
int z;
void setup() {
  // put your setup code here, to run once:
pinMode(triggerpin,OUTPUT);
pinMode(echopin,INPUT);
pinMode(9,OUTPUT);
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(triggerpin,LOW);
delayMicroseconds(2);
digitalWrite(triggerpin,HIGH);
delayMicroseconds(10);
digitalWrite(triggerpin,HIGH);
duration=pulseIn(echopin,HIGH);
x=(duration/2)/29.1;
Serial.print("Distance :");
Serial.println(x);
z=(x1-x)/2;
x1=x;
Serial.print("\t z :");
Serial.println(z);

if(z<-10)
{
analogWrite(9,25);
delay(1000);
analogWrite(9,LOW);
delay(1000);
}
else if(z>6)
{
analogWrite(9,25);
delay(10);
analogWrite(9,LOW);
delay(10);
}
else
{
  z=map(z,-10,6,1000,5);
analogWrite(9,25);
delay(z);
analogWrite(9,LOW);
delay(z);
}
}

stable_ultrasonic_brightness

Arduino
To measure the height and change brightness of LED accordingly.
int triggerpin=10;
int echopin=11;
long duration;
long distance;
long x;
void setup() {
  // put your setup code here, to run once:
pinMode(triggerpin,OUTPUT);
pinMode(echopin,INPUT);
pinMode(9,OUTPUT);
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(triggerpin,LOW); 
delayMicroseconds(2);
digitalWrite(triggerpin,HIGH);
delayMicroseconds(10);
digitalWrite(triggerpin,HIGH);
duration=pulseIn(echopin,HIGH);
x=(duration/2)/29.1;                //1/29.1=0.034 ~ speed of sound converted into centimeters per microsecond
Serial.print("Distance :");
Serial.print(x);
x=map(x,0,100,255,0);      //mapping the intensity as per distance
Serial.print("\t");
Serial.print(x);
Serial.println();
if(x<255 && x>10)                 //code stability condition
{
  analogWrite(9,x);
  }
  else if (x<10) 
  {
    analogWrite(9,0);
    }
    else 
    {
      analogWrite(9,0);
    }
}

Credits

RVLAD

RVLAD

1 project • 5 followers
ChinmayPatel

ChinmayPatel

1 project • 0 followers

Comments