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676  Using Arduino / Motors, Mechanics, and Power / Re: Power a big solenoid on: June 11, 2014, 01:35:13 am
" (I'm not sure if the energy to dissipate is 7 A x  24 V = 168 W; i think it is)"

... this is wrong, too.
677  Using Arduino / Motors, Mechanics, and Power / Re: Power a big solenoid on: June 11, 2014, 01:31:33 am
You can shout if you like, but it doesn't make it true.

If 7 A is flowing though the solenoid when you interrupt the supply circuit,   then the solenoid current will be 7 A at that instant,  and less than 7 A at all subsequent instants,  as the current is dissipated by resistive and magnetic field losses.
678  Using Arduino / Programming Questions / Re: My Piezo Buzzer Won't Cooperate With My Ping Ultrasonic Sensor and Servo on: June 11, 2014, 12:43:00 am
The most obvious recent  for the devices working separately but not together,  would be an inadequate power supply.   You cannot drive a servo directly from the arduino.
679  Using Arduino / Programming Questions / Re: Stumped by error messages - pulling from separate library on: June 11, 2014, 12:41:17 am
It took 2 minutes to find this:,92688.0.html

and this,88449.0.html

and this,28009.0.html

You seem to be confused about what #include files are,  and how they work.   Thats not surprising.   Some people still get confused after 20 or 30 years of using them.   I suggest you find a good C/C++ textbook and read it.   There are also plenty of online resources which explain how things work.

680  Using Arduino / Programming Questions / Re: Stumped by error messages - pulling from separate library on: June 11, 2014, 12:37:36 am
Well,   the best approach with error messages,  is to READ THEM.

The first error message is usually the most important one,   because other errors follow on as a consequence of the first error.

In the error messages which you posted at the top of this page,   the first error message says,  pretty plainly,   that the compiler didn't find wiring.h

Did you find it ?  Did you make sure that the compiler can find it ?

I'm not too sure if wiring.h is one of the ones which has been superseded since the arduino compiler went back from version 23 to version 1.0,   but it isn't too hard to find out.
681  Using Arduino / Programming Questions / Re: How do you program Arduino for the MPU6050 accelerometer/sensors in general? on: June 11, 2014, 12:33:02 am
Is google broken in your country ?

There are plenty of examples online of working code for the MPU6050.

It is one of the harder, more difficult, I2C sensor devices to work with.   Probably the hardest.  If you are clueless,   try gaining experience with something more at your level.

And keep in mind,  the people who make this stuff,  aren't making it for "hobbyists".   They are making it for companies which manufacture phones and automobiles and other such stuff.
682  Using Arduino / Programming Questions / Re: ASM can't reference a global variable on: June 11, 2014, 12:30:05 am
what about that stuff you need at the end with the  :-&r : stuff ?

And,  lookup is an array name,  not a variable.
683  Using Arduino / Programming Questions / Re: code compiles and uploads but no serial monitor data and no servo movement on: June 11, 2014, 12:28:39 am
How do you know the upload is working ?

Try a simple sketch,  like blinking the led,   and check that works.

And then try a simple sketch,  like "hello world",  to check your serial monitor functionality.
684  Topics / Science and Measurement / Re: CO2 ppmv & ppmw math on: June 10, 2014, 09:44:58 pm
Assuming you had a stable setup where the amount of air circulation in the room,   and other such factors were controlled,  then you might be able to observe some variations in the atmospheric concentration of CO2 just above the water surface.   But I don't think you will see much variation.  Gases diffuse pretty fast.

But anyway, supposing you can detect variations,  you would need to make a series of measurements of the water concentration using the carbonate method,   and the atmospheric test,    and observe whatever correlation there might be,  or not.  If you actual get a useable correlation,  then use that for your process control.  Good luck.
685  Using Arduino / General Electronics / Re: Measuring AC frequency (48-58V), will this work? on: June 10, 2014, 09:38:55 pm
The minimum voltage,  is what it takes to make the led inside work,  which should be the same as any other led,  around 2 to 3 volts.
686  Using Arduino / General Electronics / Re: HElp with pH meter, need fast help on: June 10, 2014, 09:35:32 pm
The description of that circuit doesn't seem to correspond to the diagram very well.
687  Using Arduino / General Electronics / Re: what is electrical noise? on: June 10, 2014, 09:12:41 pm
What is filters and what do you mean by lower impedances? I don't understand the word impedance because some people say it is resistance and some people say it is a word only used in ac electronics and not dc

...  and another 5000 word essay here ?

I don't understand the word impedance

Did they burn all the dictionaries in your country ?

I concur with the advice about wikipedia.   I have written many 5000 word essays there,  for millions of people to read and hopefully derive some benefit from.   Not just you.

688  Using Arduino / General Electronics / Re: what is electrical noise? on: June 10, 2014, 09:08:52 pm
Why don't you go Google "how to not waste your time by replying "Google it"      "

We don't google it,  because we already know the answer.....

Seriously,  what response did you expect to your stupid first question ?   Me to sit here for an hour and type out a 1000 word essay on the subject ?
689  Using Arduino / Sensors / Re: What Arduino board do I need to run 2 BMP180 sendors and a 20x4 I2c LCD display on: June 10, 2014, 08:52:37 pm
Well,  I suggest two things.

You should find a good explanation of how I2C works,  and read it.

The second odd thing I see about your code,  is that you have some I2C functions,   but you try to create an instance of it called rtc.   Are you confused there ?   You should be intstantiating an instance of an RTC object.
690  Using Arduino / Programming Questions / Re: Access parent variable on: June 10, 2014, 08:47:59 pm

That's a very retro thing to do with a class declaration.
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