Summary of Ultrasonic range finder using arduino
This article details an Arduino-based ultrasonic range finder utilizing the HC-SR04 sensor, featuring a three-digit multiplexed seven-segment display capable of measuring distances up to 200 cm with 1 cm accuracy. It supports distance readings in both centimeters and inches, suitable for applications like parking sensors and obstacle warnings.
Parts used in the Arduino Ultrasonic Range Finder:
- Arduino microcontroller
- HC-SR04 ultrasonic range finder module
- Three digit multiplexed seven segment display
Ultrasonic range finder using 8051 mictrocontroller has been already published by me in this website. This time it is an ultrasonic range finder using arduino. HC-SR04 ultrasonic range finder module is used as the sensor here. The display consists of a three digit multiplexed seven segment display. This range finder can measure up to 200 cm and has an accuracy of 1cm. There is an option for displaying the distance in inch also. Typical applications of this range finder are parking sensors, obstacle warning system, level controllers, terrain monitoring devices etc. Lets have a look at the HC-SR04 ultrasonic module first.
HC SR04 ultrasonic module.
HC SR04 is an ultrasonic range finding module with an accuracy of 0.3cm. The sensing range of this module is from 2cm to 5 meter. Working current of this sensor is 15mA and the measuring angle is 15°. The photograph of front and back side of the HC-SR04 sensor is shown in the figure above.
HC-SR04 has four pins. Their names and functions are explained below.
- Vcc: 5V supply voltage is given to this pin.
- Trigger: A 10uS long pulse is given to this pin for triggering the transmission. Upon receiving a valid trigger pulse, the HR-SR04 issues eight 40KHz pulses. Time taken by these pulses to reflect back is measured and the distance is calculated from it.
- Echo: At this pin the HC-SR04 outputs a signal whose high time is proportional to the range.
- Ground : Ground is connected to this pin.
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What is the maximum measurement range of this device?
The range finder can measure up to 200 cm. -
How accurate is the distance measurement provided by this project?
The device has an accuracy of 1 cm. -
Can the display show distance in units other than centimeters?
Yes, there is an option for displaying the distance in inches. -
What pins are available on the HC-SR04 module?
The module has four pins named Vcc, Trigger, Echo, and Ground. -
How long must the pulse be on the Trigger pin?
A 10uS long pulse is given to the Trigger pin to initiate transmission. -
What frequency pulses does the HC-SR04 issue after receiving a trigger?
The module issues eight 40KHz pulses upon receiving a valid trigger. -
What are typical applications for this range finder?
Applications include parking sensors, obstacle warning systems, level controllers, and terrain monitoring devices.
