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Kim's Comment

Thu, 11 Aug 2022 16:31:44 +0100

amazing post of interrupt and operating ultrasonic module. great help for my advanced project! thx a lot

Biomedical engineering project's Comment

Wed, 03 Mar 2021 06:54:36 +0000

nice information

Fabri's Comment

Mon, 20 Apr 2020 12:42:48 +0100

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?

Juan Alberto Guerrero Ramírez's Comment

Sat, 04 Jan 2020 13:02:28 +0000

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

ElysiumPro's Comment

Mon, 28 Jan 2019 11:31:16 +0000

Excellent information about working HC-SR04. Thanks you so much for sharing the valuable information.

embeddedschool's Comment

Sat, 04 Aug 2018 10:23:24 +0100

Informative content about arduino programming.simple and Easy to understand embedded beginners. Thanks for sharing this kind of post

Mahdi's Comment

Sat, 23 Jun 2018 06:55:28 +0100

hi
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.

Mohamed's Comment

Thu, 11 May 2017 12:56:17 +0100

hello

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 ...??

Reema Shrestha's Comment

Fri, 17 Feb 2017 11:09:50 +0000

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 the first echo in is HIGH to the time when second echo pin is high. If you could only help me with the code.

Forest Cooper's Comment

Thu, 16 Feb 2017 17:56:02 +0000

I don't know those circuit details.

Reema Shrestha's Comment

Thu, 16 Feb 2017 17:31:48 +0000

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?

Bob Jones's Comment

Sun, 20 Dec 2015 04:52:55 +0000

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 better? If so, please just email me.

Thanks!

Forest Cooper's Comment

Wed, 21 May 2014 16:36:33 +0100

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.