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Arduino Programming the HC-SR04 Project Parts List

Parts list for the Arduino HC-SR04 project

This project uses surprisingly few parts over and above the Arduino Uno board and the HC-SR04 Ultrasonic sensor module. Just a mini breadboard and a few wires. You can of course use a different sized breadboard if you wish.

You can examine the waveforms produced by this and other projects using an oscilloscope. If you don't have one then get a copy of my book: Sound Card Oscilloscope and build yourself some very capable test gear.

Arduino Uno Single Board Microcontroller

A computer on a board with everything you need to start running programs and interfacing with the real world. Includes CPU, flash, EEPROM and static RAM memory,digital and analog I/O, timers and more.

Ultrasonic Module HC-SR04 Distance Sensor For Arduino

Ultrasonic transmitter and receiver. Operates by sending out ultrasonic pulses of sound and measuring the time it takes to receive an echo.

Mini Solderless BreadBoard

A 170 point mini breadboard is perfect for this project

Hook-Up Jumber Cable Wires

You can make these yourself with some flexible wire, solid copper wire and heat shrink sleeving if you can be bothered to spend the time soldering them all up. Why not make your life easier and buy a fistfull instead. They are not expensive.

See the full range of Arduino products

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Comments (12)

Topic: Arduino Programming the HC-SR04 with Interrupts
Full StarFull StarFull StarFull StarHalf Star 4.5/5 (8)
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Biomedical engineering project (India) says...
nice information
3rd March 2021 6:54am
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Fabri (Italy) says...
Hi, i'm testing you code on arduino mega,
is it possible that the only working pin for Echo signal is 2?
Why can't I put it on a random digital input, since the interrupt is generated by the timer?
20th April 2020 12:42pm
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Juan Alberto Guerrero Ramírez (Spain) says...
I´m quite new in Arduino and I´m trying to understanding interrupts and etc...

I guess this code is super, however, it is a bit difficult for me to understand.

In any case, many thanks for sharing and useful info.

Best Regards,
Juan Alberto
4th January 2020 1:02pm
ElysiumPro (India) says...
Excellent information about working HC-SR04. Thanks you so much for sharing the valuable information.
28th January 2019 11:31am
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embeddedschool (India) says...
Informative content about arduino programming.simple and Easy to understand embedded beginners. Thanks for sharing this kind of post
4th August 2018 10:23am
Mahdi (Iran) says...
for my lesson i need your code .
can you send it for me please.
i observe publisher's rights, and introduce your site to my friends.
23rd June 2018 6:55am
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Mohamed says...

i want to use input capture in the timer so i can see in your code that you are using timer and intrrupt , however is this intrrupt is ( the intrrupt for the timer ) or normal intrrupt , im asking about that cuz my all intrrupt pins is totaly busy and i want to use the input capture feature in the arduino mega ...??
11th May 2017 12:56pm
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Reema Shrestha (Nepal) says...
I've been trying to use Interrupt and timer for two ultrasonic sensors to measure time interval between when the first sensor's echo pin is HIGH to second sensor's echo pin is HIGH. So could help me with it?
16th February 2017 5:31pm
Forest Cooper (US) says...
I don't know those circuit details.
16th February 2017 5:56pm
Reema Shrestha (Nepal) says...
If you could,just help me with the algorithm.The circuit is similar to the one used above but I've used two sensors. When the moving object is detected by the first sensor then the interrupt should be called and timer should record the time until the object is detected by the second sensor. What I've been stuck to is,mode of Interrupts(). According to your code the timer measures the value from one state of the pin to the change of pin. But in mine the case should be HIGH for both. I mean when ... Read More
17th February 2017 11:09am
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Bob Jones (US) says...
Steve, I have been reading as much as I can find about how to program the HC-SR04 Ultrasonic Sensor using a timer interrupt. I got your sketch working and am adapting it, but hitting a question about delays. In your code, you use a for loop to simulate a delay. Your comment says that a delay won't work. So what I have done is use the micros() function to do the same. Only problem is that it doesn't work... yet. Would you be willing to take a quick look at my code and help me make it ... Read More
20th December 2015 4:52am
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Forest Cooper (US) says...
Hello, I am looking for 35 of the HC-RS04 modules and cards. Do you know where I can purchase these in the US? I need them in 1-2 days! Thanks for your help.
21st May 2014 4:36pm

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