Project V - 32. Read Ultrasonic Sensor Value Data using Android Device (Arduino Based)

Read Ultrasonic Sensor Value Data using Android Device

Arduino UNO is used to measure the distance using ultrasonic SR04 ultrasonic sensors. The measurement data is displayed on HP Android. Data is sent via bluetooth connection using HC05 bluetooth module in serial communication.

Hardware Requirement

Modul Arduino Uno
HC-05 Bluetooth Module
Ultrasonic Sensor HC-SR04
Power supply +5 Volt
Jumper

Ultrasonic HC-SR04 Sensor (Source) Bluetooth HC-05 Sensor (Source)

Block Diagram

Schematic

Arduino - HC-SR04 Ultrasonic Sensor Wiring

Arduino - Bluetooth Module Wiring

Source Code/Sketch

#include <SoftwareSerial.h>
const int rxpin = 2;
const int txpin = 3;
SoftwareSerial hc05(rxpin, txpin);
int trig_pin = 8;
int echo_pin = 9;
long echotime;
float distance;
void setup() {
hc05.begin (9600);
pinMode(trig_pin, OUTPUT);
pinMode(echo_pin, INPUT);
digitalWrite(trig_pin, LOW);
}
void loop() {
digitalWrite(trig_pin, HIGH);
delayMicroseconds(10);
digitalWrite(trig_pin, LOW);
echotime= pulseIn(echo_pin, HIGH);
distance= 0.0001*((float)echotime*340.0)/2.0;
hc05.print("*T"+String(echotime)+"*");
hc05.print("*D"+String(distance,1)+"*");
if (distance<20) hc05.print("*LR255G0B0*"); //Red
if (distance>=20&&distance<=50) hc05.print("*LR255G200B0*"); //Orange
if (distance>50) hc05.print("*LR0G255B0*"); //Green
delay(100);
}

How it Works
1. Connect the Arduino with Peripherals needed
2. Plug in the Power Source on the device
3. Compile and upload the script program above to your arduino
4. Open the Android Bluetooth Electronics Apps
5. Connect bluetooth by select connect button on the top right corner

6. Select Discover tab > Pair > Select HC-05 > Connect > Done

If the Bluetooth module can't read by Apps, try to connect it manually.(Default setting bluetooth)

7. Select Ultrasonic Distance Sensor panel and tap run button

8. The result measurements of the ultrasonic sensor will show in Time and distance data, and the
circke on the right panel, the color will change depend by how far distance that measured.