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1  Using Arduino / Project Guidance / Re: Drink Mixer (precise liquid dispensing) on: August 16, 2014, 08:13:49 pm
See the same pump here for less:

I use these for Chlorine dosing my swimming pool twice a day under Arduino control.

Low voltage by the liquid stuff is a good idea!

I run mine with a little 12V power supply like  THIS:

DISCLAIMER: Mentioned stuff from my own shop...

2  Using Arduino / Programming Questions / Re: Errors compiling any IRRemote examples on 1.5.6-r2 on: August 16, 2014, 07:54:16 pm
Can anyone else verify this error on their machines??
3  Using Arduino / Programming Questions / Errors compiling any IRRemote examples on 1.5.6-r2 on: August 15, 2014, 02:12:52 pm

Suddenly I can't compile any of the IRRemote library examples. Errors like this:
---------------------( COPY )---------------------
Arduino: 1.5.6-r2 (Windows 7), Board: "Arduino Uno"

IRtest:64: error: expected class-name before '{' token
IRtest.ino: In constructor 'IRsendDummy::IRsendDummy()':
IRtest:71: error: class 'IRsendDummy' does not have any field named 'IRsend'
IRtest.ino: In function 'void testNEC(long unsigned int, int)':
IRtest:137: error: 'class IRsendDummy' has no member named 'sendNEC'
IRtest.ino: In function 'void testSony(long unsigned int, int)':
IRtest:142: error: 'class IRsendDummy' has no member named 'sendSony'
IRtest.ino: In function 'void testRC5(long unsigned int, int)':
IRtest:147: error: 'class IRsendDummy' has no member named 'sendRC5'
IRtest.ino: In function 'void testRC6(long unsigned int, int)':
IRtest:152: error: 'class IRsendDummy' has no member named 'sendRC6'

  This report would have more information with
  "Show verbose output during compilation"
  enabled in File > Preferences.

-----------------( END COPY )----------------------
This is the latest version from Github..

Any ideas? I may not have compiled this since the last couple of IDE versions...

This new IR library compiles fine:

4  Using Arduino / Motors, Mechanics, and Power / Re: Controlling vents with temperature and rain sensor on: August 14, 2014, 04:57:39 pm

I suggest you get just one thing working at a time. Like temperature measurement, Like relay control of a motor.

splitt og hersk

Get an example working software sketch for each thing separately, THEN start to combine them..

Tell us more details of your hardware.
5  Topics / Home Automation and Networked Objects / Re: Comfort turn signal controller for cars with Arduino Nano v3.0 on: August 14, 2014, 08:53:22 am
Nice idea. I think I will add this capability to the Arduino-based dashboard I am working on for my 22 year old GMC truck.

Did you think about adding an alarm for when you forget to turn the signal OFF for too long a time?  My wife usually provides that automatic system for me, but when I'm driving alone it does not work.

The Nano (Example:) usually comes with pins to plug into a breadboard or protoboard. How did you mount your Nano? How did you power it??

I would think about plugging it into a protoboard like  THIS: so there was a place for the 12V protection or regulator circuit.

DISCLAIMER: Mentioned stuff from my own shop...
6  Using Arduino / Project Guidance / Re: Computer keyboard/text acting like pushbuttons, Possible ? on: August 13, 2014, 07:37:44 pm
Please try to give us more details.

How will the 'answer' (the analog voltage) be displayed?

Will you use multiple Analog inputs (not just "A0") for multiple sources?

Where will the keystroke ("Ctrl-A") come from? A computer attached to USB? A separate keyboard?

What are you trying to do with this??
7  Using Arduino / General Electronics / Re: High current Measuring sensor on: August 13, 2014, 07:25:56 pm

This is a very good source of information on measuring current using "Current Shunts", which are really just low-resistance resistors.

"Standard" current shunts are usually 50 Millivolts (.05V) drop fullscale.  High current ones look like this:

I had one of these on my desk at IBM as a paperweight, when we trying to measure picoamps of semiconductor gate leakage

What accuracy do you need?  A standard 0.1 ohm resistor may be enough, especially if you can do a calibration with a good digital meter.
8  Using Arduino / Project Guidance / Re: My 1st Arduino project – Help please on: August 12, 2014, 10:05:06 pm

There is an example including Arduino code of using a low-cost accelerometer  HERE:
9  Using Arduino / Project Guidance / Re: Beer fermenter controller on: August 12, 2014, 10:01:18 pm
Are the fermentation tanks already fitted with Thermowells?  WIKIPEDIA

The waterproof DS18B20 sensors are widely used.. I have sold literally thousands of them that are in use in industrial and building automation applications. 

The outside diameter is about .242 inches, very close to "1/4 inch" and I have heard that some people have used them in a "1/4 inch copper tubing compression fitting" that has been threaded or welded into a tank, giving direct contact with the contents, although also having  thermal conductivity with the tank wall.  Thermowells have some of the same problem. 

I would do more research on what the very active "Arduino Brew Controller" enthusiasts are using.
10  Topics / Home Automation and Networked Objects / Re: Arduino talking on: August 12, 2014, 07:38:59 pm
If you want multiple (more than 2) Arduinos, look into RS485. This is just a way of doing Serial communications over a distance and with multiple Arduinos.  See  THIS:

NOTE: A working system with your application running over multiple Arduinos should have some organized data movement and error-checking. Nick Gammon has a nice library that does this here:
11  Using Arduino / General Electronics / Re: High current Measuring sensor on: August 12, 2014, 07:34:39 pm
Where is "Ground" in this system??

IF you can put the DC shunt type sensor at the ground end, a simple 0.1 ohm resistor will give you 2 volts at 20 amps. Low noise too.. 
12  Using Arduino / General Electronics / Re: Beginner books on: August 12, 2014, 07:29:37 pm
are there books that are a easier for beginners?

Do you HAVE an Arduino??    You'll do much better with hands-on experience.

DISCLAIMER: Mentioning stuff from my own shop...of course, but for $40 you can get a good start with  THIS:  and also see the free How-To for that kit  HERE: 

Ask here if things are confusing!
13  Using Arduino / General Electronics / Re: Looking for targeted electronics primer for using arduino on: August 12, 2014, 07:24:43 pm
The best books ARE hard-copy.  And I believe they are more productive; you can access high-resolution graphics instantly.
MAKE:Electronics  * A very good place to start. Charles Platt / O'Reilly did a nice job and very visual..
Beginning Arduino* - Michael McRoberts very good book to start with Arduino.

Then there are MANY good online resources, such as:   Terry King's Arduino How-To WIKI -(um, Me)  Detailed How-To for connecting many Input and Output devices to Arduino: Starting with Arduino, Arduino Power!: Relays and DC power control, Environmental Sensors, Ultrasonic rangers, Wireless link, and more. John Boxall's Tutorials - Regular, supported Arduino tutorial series: From blinking an LED to complex timing, wireless communication including XBee and GSM cellular, GPS and display systems - detailed tutorials with worked examples, sketches, photos and videos.
14  Using Arduino / Project Guidance / Re: Which Arduino for my film scanner? on: August 12, 2014, 07:16:32 pm
Nice work on this!  I think the MEGA was a good choice.

Interesting other work being done in this area sycu as:

15  Using Arduino / Project Guidance / Re: Beer fermenter controller on: August 12, 2014, 07:07:48 pm

Seems like the DS18B20 type temperature sensors would be good for all your applications. See  THIS PAGE:

 THIS: kind of sensor package may be good.

For How-To read multiple sensors on a single Arduino pin see  THIS:

For the relays, all your requirements seem to be handled by THIS: type relay board, available with 2,4 or 8 relays: 

Make sure you google "arduino brewmaster" .. much has been done about this.  Humans have put a lot of effort into making alcohol for, oh, maybe 5 or 10 thousand years.

DISCLAIMER: Mentioned stuff from my own shop...
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