Components

	Arduino Pro Micro Sparkfun	x 1
	HC-SR04 Ultrasonic Ranging Sensor Module	x 1

Tools, APP Software Used etc.

	Soldering Iron Wire Welding Lead Roll
	Soldering iron
	arduino IDE Arduino

Description

Ultrasonic distance sensor

Ultrasonic Distance Measure

Measure distances by connecting this device to your smartphone with an USB cable. It has an android app to show the measure. It can measure distances anywhere from 0.01 to 5 meters. Great of measuring 90 degree distances. As it has ultrasonic technology, it is not affected by lighting conditions like laser or camera measurement.

Assembling.

The assembling is very straight forward. First the Arduino Pro Micro board has to be soldered to the board. Then, you have to bend the ultrasonic sensor's pins so that it has a 90 degree angle. Now solder the ultrasonic sensor to its place. It should be stacked on top of the Pro Micro.

Programming.

I chose the Arduino Pro Micro because it is based around the ATmega 32U4. This chip has the ability to communicate as a keyboard to the computer.

The code is written on Arduino, so it has to be uploaded from the Arduino IDE. The board is called Arduino Micro on the IDE and it should appear under the Arduino AVR Boards section.

Upload the code and it's ready to use.

Enclosure.

If you have access to a 3D printer, you can print a custom enclosure for the device. It is a simple model, it doesn't require support structures to print.

Application.

To install the application, simply download the .apk file and open it. There is only support for Android devices.

The application has a simple design that can easily be understood.

Code

Arduino

/*
 * 
 * 
 */
#include <Keyboard.h>
long readUltrasonicDistance(int triggerPin, int echoPin)
{
  pinMode(triggerPin, OUTPUT);  // Clear the trigger
  digitalWrite(triggerPin, LOW);
  delayMicroseconds(2);
  digitalWrite(triggerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(triggerPin, LOW);
  pinMode(echoPin, INPUT);
  return pulseIn(echoPin, HIGH);
}
void setup()  { 
   Serial.begin(9600);
  Keyboard.begin();
 }
void loop()  {
     Serial.println(0.01723 * readUltrasonicDistance(3, 5));
    Keyboard.print(0.01723 * readUltrasonicDistance(3, 5));
    Keyboard.press(0x20);
    Keyboard.releaseAll();
    delay(500);                   
 }

Schematic and Layout

Application

UltrasonicReader.apk

CAD-Custom parts and enclosures

Case_Part1

Case_Part1.stl

Case_Part2

Case_Part2.stl

Download Gerbers

Sep 06,2022

1,160 views

Ultrasonic distance sensor

Measure distances from your smartphone!

1160

Published: Sep 06,2022

Download Gerber file 5

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