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61  Using Arduino / Project Guidance / Re: Can arduino made touch pad control an arduino rc car? on: October 24, 2012, 03:27:56 pm
By "touch pad" I thought you ment like those little pads normally found on laptops that can be used instead of a mouse.  What you linked to I would consider a "touch screen" and yes I am familiar with examples and tutorials for those...  smiley

better worded, Can i use an arduino to control another arduino that is attached to motors, etc. If so, then we can use the article above to help us control it using touch smiley

Of course you can!  There are many ways to do so, but regardless of how you do it the basic idea is to send predetermined signals correlating to specific commands to the car's movement from one Arduino to another.  Here's an example using generic binary data, but the concept is the same.  I'd image you'd prefer a wireless means of communication, and there's quite a few options but probably Xbee would be the easiest to find tutorials on.  The way you input these commands into the first Arduino really won't make a difference to the rest of the software, as it can be an entirely self-contained set of code.
62  Using Arduino / Project Guidance / Re: Ways to encapsulate my circuit on: October 24, 2012, 03:02:38 pm
Well I gave a basic description of one effective process for using expoy.  If you were to use something like a silicone caulk, you'd need something to hold the resistor and reed switch after soldering.  You could use a small vise or a thrid-hand, even a pair of clothespins, anything that will allow you to apply the caulk around both components and allow it to cure for 12 to 24 hours without touching anything.  If you are using hot glue a vise or third-hand would also help, but it would take less time for the glue to cool than silicone to cure.

Whatever you encapsulate the parts in make sure it yields a water-tight seal that can also absorb some physical shocks and is electrically non-conductive.

By the way it is possible to buy reed switches that are already encapsulated, some even in packages with mounting slots
63  Using Arduino / General Electronics / Re: Nice, I just bought myself 2 Super Capacitors for $18 bucks + P&P on: October 24, 2012, 02:03:57 pm
I'll find a use for them someway somehow lol....

Too bad they're voltage is so low, otherwise this comes to mind. smiley-evil
64  Using Arduino / Project Guidance / Re: Firework Launch System. on: October 24, 2012, 01:49:39 pm
I do plan to have a safety system, and this will be built into the firing circuit by way of a key switch to isolate the power for the ignition side.

Great, I just wanted to make sure you thought about it.
65  Using Arduino / Project Guidance / Re: Can arduino made touch pad control an arduino rc car? on: October 24, 2012, 01:27:23 pm
Off hand, I don't know of any tutorials or libraries for touch pads.  However, there are touch pads that use USB to connect to a PC.  So with one of those devices, the worst case would involve determining which signals being sent over USB correlated with what position on the touch pad.  It would be tedious but not that difficult if you had a logic probe or oscilloscope.  Hopefully some Googling would reveal someone already did this with a specific touchpad that's widely available. 
66  Using Arduino / Project Guidance / Re: detect water and turn on!!! on: October 24, 2012, 01:15:23 pm
This is a reliable way to do it -- and draws hardly any power (actually negligible compared to the self-discharge of a Li-ion); remember that a microcontroller like on an Arduino processes the measurement (a few instruction cycles) in much less than a millisecond, and then goes to sleep, where the current draw is very close to zero.

My thought was that the energy savings would primarily come from the LCD being off.  While the microcontroller can go to sleep as you described, while in use the LCD must either be on constantly or cycled on and off fast enough to appear to be constantly on to the human eye.
67  Using Arduino / Project Guidance / Re: detect water and turn on!!! on: October 24, 2012, 12:54:28 pm
(and presumably they turn off when above),

Yes, but only after a while - 10 minutes?

Hmm, makes sense thanks for the information.
68  Using Arduino / Project Guidance / Re: detect water and turn on!!! on: October 24, 2012, 12:44:01 pm
On the other hand, I suppose there might be some cost to monitoring the pressure, and the designer might have designed it to only do that when it immersed. I suppose the resistance measurement would tell it that, too.

If nothing else it might be an energy saving feature.  The OP mentioned that dive computers turn on automatically below a depth of 3 ft (and presumably they turn off when above), so this type of automation also could be eliminating one thing a SCUBA diver will have to have on their metaphorical checklist before a dive.
69  Using Arduino / Project Guidance / Re: Ways to encapsulate my circuit on: October 24, 2012, 12:31:21 pm
 There are ways to encapsulate, or pot, electronics at home.  Probably the most robust would be to start with small container made from a hard plastic, then mostly fill it with epoxy, and hold the electronics about halfway down the container until the epoxy cures.  However, cheaper and less time consuming methods would be to completely surround the components with either hot glue or silicone caulking, either normally mounted on a PCB or encasing them separately.

Edit: PeterH beat me to the post.
70  Using Arduino / Project Guidance / Re: Arduino car horn on: October 24, 2012, 11:52:00 am
While PeterH is correct, unless space is at a premium you could also get actual car horns.  Since automobile electrical systems are based on automotive batteries, most would only require 12 VDC to operate.  They would be interefaced to an Arduino similar to a uni-directional 12 VDC motor, in that you'd use a relay or power MOSFET to turn the horn on and off.
71  Using Arduino / Programming Questions / Re: CoinSlot to Arduino... Need Help on: October 24, 2012, 10:38:39 am
For debugging purposes, I would have some message to the Arduino IDE's serial monitor that displays when the void coinInserted() is called.  Just placing one right at the end would give an indication if your ISR is even being called.
72  Using Arduino / Project Guidance / Re: Firework Launch System. on: October 24, 2012, 10:10:43 am
I'm not a firework expert, but with this type of project it's always good to have redundant safety systems.  You didn't mention any physical interlocks on this unit.  I would include at least one on either the main power or the signal out of the control unit.  You can get a key switch/key lock fairly inexpensively (don't let the first few items listed in the link scare you smiley-wink, Sparkfun also has some though they don't have voltage and current ratings).  Of course you'd generally have to pay a bit extra for non-generic keys, but that likely isn't a requirement for this project.  Otherwise, the most basic are similar to what you'd find on bike locks or locks on IT equipment.
73  Using Arduino / Motors, Mechanics, and Power / Re: Questions for speedometer moto with arduino on: October 24, 2012, 09:50:15 am
Maybe i have to choose a magnet sensor but who?
Something like this sensor?

The linked sensor is certainly a possibility and would work very well in this type of application.  That is if you don't mind spending the money on it.  I haven't priced any Hall Effect sensors of that grade recently, but it wouldn't surprise me if that sensor was over $50.00 a piece (especially for a low volume order).  Of course it appears to be a very robust unit in protective packaging intended for industrial conditions.  Therefore without extenuating circumstance (like a crash damaging the front-end of your motocycle), you'll probably never have to replace it. 

However, there are more budget friendly options which would still be effective.  For example, here's a Hall Effect Sensor that's $0.95 at Sparkfun, and you could get something like it for at least a little less through a major electronics distributor like Digikey, Mouser, or Newark.  The obvious difference is how it's packaged, but this one would need a small magnet to work properly.  Whereas the one you linked to might be sensitive enough to detect the spokes of the wheel moving past it without a a magnet.  Another low cost option would be a reed switch (that one has an extra case to make it more durable).   
74  Development / Suggestions for the Arduino Project / Re: Is Arduino Due coming? on: October 24, 2012, 08:36:01 am
One of the pre-defined boards is the Arduino Due...

Well it's nice to know the support of the two organizations is a two-way street.
75  Using Arduino / Motors, Mechanics, and Power / Re: Using DC adaptor and USB cable as power supply ? on: October 23, 2012, 05:30:26 pm
But still I would like to upload some code to my Arduino, is it safe to plug in usb cable at the same time with dc adaptor?

Yes, provided the DC adaptor is within the on-board voltage regulator's input range.  Arduinos with an on-board voltage regulator are designed to always take power from the regulator when available, even when connected to a computer via USB.  In that case only the USB cable is only used for serial communication.

In more case, is it safe to plug in usb cable, dc adaptor, and 4 AA battery at the same time?

If the DC adaptor is pulgged into the barrel jack and the AA battery pack is correctly connected to VIN and GND pins, it won't cause any harm...  However, you wouldn't want to do that without at least putting a diode in between the positive lead from the battery pack and the VIN pin.  This will make sure the current is only being drawn from AA batteries when the DC adaptor is unplugged or otherwise not providing current.
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