[TriEmbed] TriEmbed Digest, Vol 20, Issue 11

[Glen Smith]

I still don't see a photo, I wonder in the mailing list strips off
attachments?

Is this version one that requires cutting the wire? The pic on Amazon makes
it look that way but there isn't a lot of documentation posted.

Glen
On Jan 20, 2015 8:45 PM, "Dwight Morgan" <dwight.w.morgan at gmail.com> wrote:

> Just a follow-up on my efforts to measure current using the ACS712 Hall
> Effect sensor. I decided to buy a 5 amp model to experiment with, thinking
> the 20 or 30 would be a little dangerous just for testing. I received it
> from Amazon via UPS and the package appeared to have been run over with
> what looked like tire marks and the pins were bent down and over to the
> side but not touching. So, I made a rig to do some testing at first with a
> lamp with no success and then DC with no success. Today, while I was
> looking for more wire I found one of my wife’s old hair dryers with 1200
> watt rating. If I turn it on low in “air” mode it produces over 4 amps –
> perfect. As soon as I connected and turned it on the amps on the Serial
> Monitor jumped to a little over 4 amps. I couldn’t believe it so I got my
> clamp-on and surprise it also read a little  less than 5 amps. It’s an old
> analog so it may be a little off on the low end. Side note: I accidentally
> ran the dryer way above 5 amps and the reading went erratic all over the
> place, but came right back. That ACS712 is a tough and forgiving little
> piece of hardware to be smashed and overcurrented and be okay.
>
>
>
> Anyway, I added a little code to the code I borrowed from one of the
> Arduino forums and did a screen shot of the code and the output on the SM.
> I’m attaching the screen shot so if anyone wants to please comment on any
> of it I would be most appreciative.
>
>
>
> Again, my application goal ultimately is to track when my hot water heater
> is on and off.
>
>
>
> Thanks from this newbie!
>
>
>
> Dwight
>
>
>
> PS: That was fun to get that thing working.
>
>
>
> *From:* Martin Brooke [mailto:martin.brooke at duke.edu]
> *Sent:* Wednesday, January 14, 2015 9:49 PM
> *To:* Dwight Morgan
> *Cc:* TriEmbed Discussion
> *Subject:* Re: [TriEmbed] TriEmbed Digest, Vol 20, Issue 11
>
>
>
> I used an audio jack breakout on an arduino proto shield with a simple RC
> circuit to level shift the AC.
>
>
>
> here is a photo
> <https://drive.google.com/file/d/0B0lP-6BNGel_a09EbFBkeDJWamc/view?usp=sharing>.
> The proto shield is this one from  sain smart
> <http://smile.amazon.com/SainSmart-Prototyping-Prototype-Breadboard-Arduino/dp/B0079WI2MK/ref=sr_1_4?ie=UTF8&qid=1421289842&sr=8-4&keywords=Prototype+Shield> although
> there are many alternatives for this.
>
>
>
> The break out was from sparkfun <https://www.sparkfun.com/products/10588>
> for which you need some headers <https://www.sparkfun.com/products/116>and
> the jack <https://www.sparkfun.com/products/8032>  maybe you can find one
> assembled
>
>
>
> There is also two resistors and a capacitor needed to get the AC signal
> into the ADCs input range.
>
>
>
> I really just copied the circuit from this intructable
> <http://www.instructables.com/id/Yun-based-Electricity-Monitor-with-Cloud-Support-T/?ALLSTEPS>
> .
>
>
>
> The instructable goes way further, using an Arduino Yun to make it
> readable via wifi, very cool, but maybe beyond what you want or need.
>
>
>
> Cheers,
>
>
>
> ​​
>
>
>
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>
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