6/29/15, 11:13 AMArduino Ultrasonic Proximity Sensor

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Arduino Ultrasonic Proximity Sensor This circuit was tested and worked properly!

Posted by T.K. Hareendran in Arduino, Tested with 2 comments Tagged with: proximity sensors

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This is an Arduino-based Proximity Sensor circuit wired using the popular HC-SR04 Ultrasonic rangingmodule,used here for non-contact object detection purpose. The HC-SR04 module includes ultrasonictransmitters, receiver and control circuit. You only need to supply a short pulse to the trigger input to start theranging, and then the module will send out burst of ultrasound at 40 kHz and raise its echo.

The set-up process is very simple, and best understood by referring the wiring diagram. If everything goes

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6/29/15, 11:13 AMArduino Ultrasonic Proximity Sensor

Page 2 of 5http://www.electroschematics.com/10448/arduino-ultrasonic-proximity-sensor/

right,you should see the burning eye of the red LED when there is no object in the safe-zone (within 5 cmfrom the HC-SR04 module), and an ear-splitting beep from the piezo-buzzer otherwise.

Arduino Ultrasonic Sensor Wiring Diagram

Arduino Sketch

1. /*2. Project: Ultrasonic Proximity Sensor3. Sensor: HC-SR044. Courtesy Note: Inspired by the Arduino Ping Sketch5. Tested At: TechNode Protolabz / June 20146. */7. //Pins for HC-SR048. const int trigPin = 13;9. //Pin which delivers time to receive echo using pulseIn()

10. int echoPin = 12;11. int safeZone = 5;12. // Pins for Indicators13. int statusLed = 11;14. int pzBzr = 10;15. void setup() {16. }17. void loop()18. {19. //raw duration in milliseconds, cm is the20. //converted amount into a distance21. long duration, cm;22. //initializing the pin states23. pinMode(trigPin, OUTPUT);24. pinMode(statusLed, OUTPUT);25. pinMode(pzBzr, OUTPUT);26. //sending the signal, starting with LOW for a clean signal27. digitalWrite(trigPin, LOW);

6/29/15, 11:13 AMArduino Ultrasonic Proximity Sensor

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28. delayMicroseconds(2);29. digitalWrite(trigPin, HIGH);30. delayMicroseconds(10);31. digitalWrite(trigPin, LOW);32. //setting up the input pin, and receiving the duration in uS33. pinMode(echoPin, INPUT);34. duration = pulseIn(echoPin, HIGH);35. // convert the time into a distance36. cm = microsecondsToCentimeters(duration);37. //Checking if anything is within the safezone38. // If not, keep status LED on39. // Incase of a safezone violation, activate the piezo-buzzer40. if (cm > safeZone)41. {42. digitalWrite(statusLed, HIGH);43. digitalWrite(pzBzr, LOW);44. }45. else46. {47. digitalWrite(pzBzr, HIGH);48. digitalWrite(statusLed, LOW);49. }50. delay(100);51. }52. long microsecondsToCentimeters(long microseconds)53. {54. // The speed of sound is 340 m/s or 29 microseconds per centimeter55. // The ping travels forth and back56. // So to calculate the distance of the object we take half of the travel57. return microseconds / 29 / 2;58. }

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6/29/15, 11:13 AMArduino Ultrasonic Proximity Sensor

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2 Responses to "Arduino Ultrasonic Proximity Sensor"

1. Eldho varghese says: on September 20, 2014 at 12:28 pmreply

helloo,

thats a good project i think. can we increse the distance other than 5cm?? will that sensor sense morethan 5metre?? reply me sir…. i need the information..

2. Jim says: on September 23, 2014 at 8:10 pmreply

Halloween is approaching.I would love to see this expanded to include two sensors to run a servo with follow me eyes.Kind of like what is discussed here.http://www.instructables.com/id/Halloween-Props-That-Turn-to-Look-at-You-as-you-Wa/?ALLSTEPS

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