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1  Topics / Home Automation and Networked Objects / Re: Cannot get network shield to work on: September 08, 2014, 08:42:26 am
Thought those electronics were small enough to get through anything...  smiley

Glad you got it working..
2  Topics / Home Automation and Networked Objects / Re: Safe way? on: August 31, 2014, 11:06:10 am
Hi,
Take a look at Arduino Power  HERE:

You do not not want exposed 240 or 120 VAC near your Body or your Arduino. Use optically-isolated relays like  THESE:, or look at X-10 remote switches and dimmers, or look at RF-controlled outlets, or look for "PowerTail"

DISCLAIMER: Mentioned stuff from my own shop...
3  Using Arduino / General Electronics / Re: Motorized rotary switch on: August 30, 2014, 10:00:04 am
Quote
16-position rotary switch to switch between HP lines
OK, switching just one side of each HP (Speaker) wires, right?

Quote
May be just as well to use two of these.

No cheaper, better way, I think... And you CAN connect two speakers or more in parallel to test amplifiers rated at 4 or 2 ohm loads.

If you want those relays fast and expensive you can get  THIS:

You can get FEDEX or DHL at a cost, probably $20

DISCLAIMER: Mentioned stuff from my own shop...
4  Using Arduino / Project Guidance / Re: my first project on: August 29, 2014, 02:29:00 pm
I suggest you start  with ArduinoInfo.Info HERE (click):

Start  HERE:  to learn about Arduino Sketches (Software).
5  Using Arduino / General Electronics / Re: "Group purchase" of electronic components on: August 29, 2014, 02:08:15 pm
Hi,
Shipping is a major issue with components from China.  I ship thousands of parts via DHL from Shenzhen to Vermont USA to build kits. It's expensive but usually fast (like 3-4 days to East Coast USA).

Shipping small amounts to customers worldwide is better; IF you can find a shipping aggregator company that will give you part of their discount on DHL.  But you need volume to get that. I ship 200 or so a month so they are more friendly.

I just wanted to do Electronics, but Shipping is a necessary hassle. Fortunately my good friend and partner Peng has most of it figured out now.  What we say is on  THIS: page.
6  Using Arduino / General Electronics / Re: Motorized rotary switch on: August 29, 2014, 01:37:06 pm
Quote
I've made motorized rotary switches like below using servos.

This would work easier with servos if the "Detent" spring was made weak so the rotary force (AKA Torque) needed would be less. Or the small ball bearing in most detent mechanisms can be removed.
7  Using Arduino / Project Guidance / Re: Guidance for temperature control project on: August 28, 2014, 08:55:51 pm
Does the relay work OK if you just run it with the Blink program?? 

NOTE these relays are active LOW.    Do you have anything connected to the relay outputs yet?

See Arduino Power on the ArduinoInfo.Info Wiki   HERE:
8  Using Arduino / Project Guidance / Re: aquaponic light and pump loop help on: August 28, 2014, 08:45:47 pm
Quote
you will notice i need help with the syntax too

You need to understand the use of  {   and } brackets to define groups of statements that go together.

This:
Code:
  unsigned long currentMillis = millis();
 
  if(currentMillis - previousMillis > interval1) {
    previousMillis = currentMillis;   

   
    if (pumpState == LOW)
      pumpState = HIGH;
    else
      pumpState = LOW;                       // These two statements are NOT grouped together
    digitalWrite(pumpPin, pumpState);
  }

Does not work because you are not controlling which statements go together...

Try this kind of structure:

Code:
  unsigned long currentMillis = millis();
 
  if(currentMillis - previousMillis > interval1)

 {  // DO this if the interval has ended 
    previousMillis = currentMillis;   

   
    if (pumpState == LOW)
   {
      pumpState = HIGH; 
     digitalWrite(pumpPin, pumpState);   // MAYBE you were trying to do this ??
   }

  } // end of DO this if the interval has ended 

Maybe look at this example of starting program structure:
http://arduino-info.wikispaces.com/YourDuinoStarter_SketchTemplate
9  Using Arduino / Project Guidance / Re: Newbie to Arduino and the idea for my purchase on: August 28, 2014, 04:34:36 pm
HI,
Look for the Car Computer guys on the web.

Like  THIS:
10  Using Arduino / Project Guidance / Re: First project: too much choice. on: August 28, 2014, 04:28:55 pm
Look at  THESE:

The Education part is  HERE:

Looks like this:


DISCLAIMER: Mentioned stuff from my own shop... but Adafruit and Sparkfun have good kits too.

We build these in Vermont USA and have shipped over 1000 to schools and hobbyists and Maker Groups this year.
11  Using Arduino / Project Guidance / Re: Inceasing PWM frequency on: August 28, 2014, 04:18:10 pm
See  THIS: on the ArduinoInfo.Info wiki.
12  Using Arduino / Project Guidance / Re: Arduino freezing problems (Peltier controller) on: August 28, 2014, 04:14:51 pm
Hi,
Wow,
Quote
The whole system in picture :

That looks like a LOT of antennas near each other.

And the POWER stuff like FET on the same breadboard as the switches.  Looks like trouble.

Suggest you get a metal plate as a base, and rewire all this, with Power supply, Loads, FET in one section, all the low-power things in a separate area. Suggest a bolt into the metal base next to the power supply negative with wires from the FET Ground/Source and the Arduino grounds to that common point.
OH: the Computer with the USB: You may want to connect it's case ground to the common ground point! Think about where the BUILDING ground comes into all this.  You do not want multiple ground paths.

The mechanical design of something like this is as important as the electrical design, and they go together.

Get the power part working with a simple test sketch, THEN start adding the inputs, display, etc. 
13  Topics / Home Automation and Networked Objects / Re: help me how to make clap clap off and single clap off for relay with arduino uno on: August 28, 2014, 03:17:39 pm
Hui,
You need a microphone and amplifier and maybe also a comparator.

There are small modules like  THIS: that would work.  Yoiu can adjust the sensitivity with the potentiometer and get a digital output you can sense with Arduino. You need to write a software sketch that counts the sound peaks.

Simple relays like  THIS: would work for most things.

DISCLAIMER: Mentioned stuff from my own shop...
14  Using Arduino / Project Guidance / Re: Arduino freezing problems (Peltier controller) on: August 28, 2014, 03:03:51 pm
Hi,

WHERE is "GROUND"?? May be the question.

On any high-power system like this you must use careful common-ground-point connections.

I suggest that that point may be the power supply negative terminal.

So, to that point, with separate (large for high-current circuits) wires you would connect:
  • Power supply negative terminal
  • Power FET "ground" SOURCE terminals
  • Arduino Ground pins (ALL of them)
  • Any signal circuits/devices

What other devices do you have (ALL of them)??  How are they wired?

You need to keep signal wires away from the high-power circuits.

You may have to completely isolate the 36V supply, Power FET and load with an optical isolator.

More details or a diagram of your system would help the helpers here.
15  Using Arduino / Project Guidance / Re: Arduino Nano 3.0 + NRF24L01 on: August 28, 2014, 02:47:40 pm
Hi,
I updated  the page on ArduinoInfo.Info  HERE: to show a capacitor value of 3.3 to 10 uF.  I have often used 3.3 uF tantalum caps here.
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