Instructables

Arduino Distance Detector with a Buzzer and LED's

Picture of Arduino Distance Detector with a Buzzer and LED's
This is a simple guide on how to make a distance detector using an Arduino, a HC-SRO4 Ultrasonic Sensor, a Buzzer, and some LED's.  The ultimate goal of this tutorial is to use the buzzer and LED's to display how far the object is from the ultrasonic sensor.
 
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Step 1: Materials Needed

Picture of Materials Needed
The Materials needed for this project are:

(1x) Arduino Uno
(1x) Breadboard
(1x) HC-SRO4 Ultrasonic Sensor
(1x) Buzzer
(2x) Green LEDs
(2x) Yellow LEDs
(2x) Red LEDs
(7x) 330 ohm Resistors
A lot of jumper wires

Step 2: Setup

Picture of Setup
The photo above shows the setup of the project.  The jumper wires should be connected as follows:

Connect a jumper wire from the 5 volt pin on the Arduino to the bottom channel of the breadboard
Connect another jumper wire from a ground pin on the arduino to the upper channel of the breadboard

Buzzer -> pin 3

(On Ultrasonic Sensor)
Echo -> pin 6
Trig -> pin 7

(In Order from Right to Left)
LED1 -> pin 8
LED2 -> pin 9
LED3 -> pin 10
LED4 -> pin 11
LED5 -> pin 12
LED6 -> pin 13

The jumper wires connected to the LEDs should be connected to the lead on the right, while the left lead of the LED should connected to the ground channel via a 330 ohm resistor.  

Step 3: Assembly: Breadboard

Picture of Assembly: Breadboard
First things first, let's connect the 5 volt and ground pin to the breadboard.  Again, the wire attached to the 5 volt pin should be connected to the bottom channel of the breadboard, while the wire attached to the ground pin should be connected to the upper channel of the breadboard.
SASOUN5 months ago

Could you please tell me how to modify this circuit and code for a 10 led bar graph display, while using a Parallax PING))) sensor and buzzer. Thank you.