making mosquito high frequency to repel

I don't know if a piezo speaker/buzzer gets you the right frequencies, but here is an example circuit from Oomlout to make sound:

http://www.oomlout.com/oom.php/products/ardx/circ-06

For the high frequencies, maybe keep an eye on nearby dogs and cats when testing - they can hear up to something like 65-85KHz.

And I guess you can do testing with a few pop-bottle and yeast mosquito traps (one with your repeller, the other without) - that's assuming those traps work

Good luck, hope it works out!

Cheers,

-Nico

Did not see any specs on FreQ range on oomlout.

Will need a High Freq speakers but also may have to test with lower freq.  I think some type of noise will repel them.

That Oomlout example is only showing how to hook up a piezo speaker/buzzer and gives a very basic example of how to make some tones, but you can modify the code to get to your desired frequency. Look at their comments for notes, for example:

* note      frequency      period      timeHigh

* c     261 Hz     3830      1915 

I'm guessing that changing timeHigh to 19 would give you close to 26,100 Hz, or 26 kHz.

You'd have to do some math to figure out the required delays to get the desired frequencies (smaller delay = higher frequency), but the rest is pretty much there for you to use.

Cheers,

-Nico

@chinino

Why, in the face of evidence to the contrary, are you so convinced that some noise at some high frequency will upset mosqitos. ?

Here is a link to supplement Michael Tria's post.

http://www.bbc.co.uk/news/magazine-20669080

Before you start trying to make any noise try to find some research results that indicate what sort of noise might be effective.

If you can find any then post a link here I'll be very happy to advise you about how to generate the sounds.

MK

There are people who want to believe that the Second Law of Thermodynamics can be violated. That the circle can be squared. That there is a map that need more than four colors. That even though the flu vaccine is a killed vaccine, that it will give them the flu.

Most of the time such antics keep them busy, and out of harms way. Sometimes, like Andrew Wakefield and the phony MMR-autism link, they do real damage, and kill thousands. Looking for some fx that will frighten away mosquitos is a relatively harmless though fruitless pastime.

@ michaelkellett

Why, in the face of evidence to the contrary, are you so convinced that you should take someone's failure as written in stone. 

I did not start this question.  But let the man try if he wants to.

There are people who will help and encourage while there are some that are just such downers.

So, rick alexanderson  should not even post the question unless you approve.

Before you start making noise let the man post his question and let others offer advise.

@ michaelkellett

Why, in the face of evidence to the contrary, are you so convinced that you should take someone's failure as written in stone. 

I did not start this question.  But let the man try if he wants to.

There are people who will help and encourage while there are some that are just such downers.

So, rick alexanderson  should not even post the question unless you approve.

Before you start making noise let the man post his question and let others offer advise.

Is it being a downer to reject a thesis that has been repeatedly demonstrated as false. The Cochrane Reviews are a reputalble organization, and they have found 10 studies that demonstrated the failure of high fx sound in chasing mosquitos, and none that supported it.

When I was very young I tried to make a radio with a shoebox top and some copper wire. My father explained to me that it would never work. Was he being a downer or a realist? When I was old enough, he helped me make a radio. He often explained to me why some of my ideas were more "magical thinking," than reality based. This was in fact useful in later life.

I spent my career in the physical sciences. Every morning I held a coffee and danish discussion in my office which was attended by anyone who wanted free coffee and danish. We talked about the problems that we were having with our work. One of the most useful things that anyone could do was to say (and back up with sources) that an approach wouldn't work. It would often save months of work that would lead nowhere.

No where did I suggest that I should be a referee for anyone's work. Stop putting words in my or anyone else's mouths. And you further want to censor me, telling me that I should not comment until everyone else is finished speaking. I was not just making "noise" as you proclaim, but probably know more about mosquitos than most other people here, as my career was in Public Health. And I backed it up with a source (Cochrane Reviews.) The man posted his question, I went on to advise that he was barking up the wrong tree.

????

I agree with you, but was not talking to you or putting you down.

Please read message and you will see it was not directed to you.

We are all entitled to waste our time as we see fit.

Then who were you talking to? I am the one who made the statements that were supported by Michael Kellet. No one on a blog speaks in a vacuum. If you want to do that, PM.

ok.  Did not think I would have to explain something like this.

And please do not think that my response is in any way trying to put you down.

I started my response with @ someone.  That means my response was direct to a specific person not to you.

Someone responded directly to me,  I responded to directly to that person.  Regardless of who said what, it was directed to a specific person that was directing to me.

@ michaelkellett

Why, in the face of evidence to the contrary, are you so convinced that you should take someone's failure as written in stone.

Have a nice day

IMO

Rick asked a question and indicated what the intended application was for.

There were answers provided that indicate that while he might be able to generate the frequencies, it is unlikely to achieve the result for which he wants it to.

Personally, I would appreciate that someone took the time to say the result won't work, and give some pretty good sources and explanations why it didn't as well.

I'm pretty sure from what I read in the link posted by Michael Kellet, that it wasn't one persons failure, it was multiple.

Some of the radio broadcast ones are highly likely to fail due to bandwidth limitation along with the performance of the radio and speaker, but other test show that Electronic Repellent fails to deliver the result.

So the question to Rick (assumming he is still listening)

Do you have some other reason to try this (science experiment, thesis exploration) or was it an attempt to make something that retails somewhere else.

Mark

@chinino

I'm not sure they were replying, as much as adding to the bottom of the conversation.

Only lately I have deliberately tried to reply to the part of the message thread I needed to.

In the past I simply replied at the bottom, then had trouble quoting.

Mark

Even if evidence abounds, I think it's good science to confirm things, especially if you run the tests slightly differently than was done before. Worst case, you'll have more evidence that shows it doesn't work

I just ran into a relevant quote today on this website:

"...back in the Middle Ages, people came up with all sorts of ideas that were commonly thought to be true and were even put into print, but were never tested, never verified."

They have some cool examples too. Of course, for all I know this could all be made up fairy tales, so it could probably use verification and retesting too

But hey, imagine where we'd be today if nobody dared to retry a few things that were previously thought to be impossible.

Cheers,

-Nico

The way I see it is that if some one asks for help to climb over a fence the proper thing for me to do is to point out that there is a cliff on the other side before I lend him my ladder.

I did say that  if some reasonable reference material suggesting the kind of sounds that would deter mosquitos was provided I would help the OP to design a device.

The offer (and the implied challenge) still stand.

MK