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241  Using Arduino / Project Guidance / Re: Arduino to Play any audio file from computer on: September 16, 2013, 10:59:25 am
AutoHotkey‎ can both listen to serial port and trigger the sound reproduction.
242  Using Arduino / General Electronics / Re: DC signal when AC is connected on: September 12, 2013, 12:53:18 am
A bridge rectifier and and optocoupler come to my mind.
243  Using Arduino / Project Guidance / Re: robot following one specific human on: September 11, 2013, 11:45:59 am


Skip to 20:10 to see it in action.
244  Using Arduino / General Electronics / Re: Re-inventing the wheel (SPDT switch) on: September 11, 2013, 12:31:31 am
http://www.dummies.com/how-to/content/electronics-projects-how-to-build-a-not-gate-circu.html
245  Using Arduino / Project Guidance / Re: Project Guidance GSM Location. on: September 09, 2013, 12:17:39 am
It would be a lot simpler if you could get your hands on an Android phone. They have Google maps that can tell you quite accurately where you are when there are multiple antennae around. In urban area my phone is accurate to around 100m, in rural it is usually within 500-1000m.

Android is also a platform which allows you to write your own applications. One that uploads your location to a web server for your robot to fetch would be required.
246  Using Arduino / Project Guidance / Re: Host project on: September 07, 2013, 05:29:48 pm
There is a section on these forums for such things:
Other Software Development
247  Using Arduino / Project Guidance / Re: Help needed ASAP on: September 07, 2013, 09:17:43 am
Arduino is not good for image processing.
Why not use Arduino directly to measure the water level? Taking a picture of a meter and then analyze the picture seems like a lot of unnecessary work.
248  Using Arduino / Project Guidance / Re: Should I use a gyroscope? on: September 06, 2013, 04:48:59 am
Sounds like driver issue.
You could also use rotary encoders to actually measure the speed of each motor, or replace the DC motors with steppers. That way you can make sure they are spinning at the same rate, or any different rate you want. Provided there is little or no slippage, you can turn fairly accurately.
249  Using Arduino / Project Guidance / Re: Should I use a gyroscope? on: September 06, 2013, 02:06:38 am
That's pretty much what gyros are made to do.
But you should know the limitations of gyro. In time it will lose accuracy (I don't mean the electronics will degrade over the years, but it will accumulate measurement errors).
250  Using Arduino / Project Guidance / Re: Keypad and Stepper on: September 05, 2013, 02:35:35 pm
Welcome to the forums.

You need to know what position you want to get to and more importantly what position you currently are at. When you know your position, you can move in the required direction.
251  Using Arduino / Project Guidance / Re: NEW Project on: September 05, 2013, 01:36:40 pm
You could go with stepper motors or DC motors with rotary encoders.
Depending on what route you decide to go with you'll need an adequate motor driver.

The size of the robot and what you want to achieve is something you should define so you can get more specific advice.
252  Using Arduino / Project Guidance / Re: Arduino Wireless Programming on: September 04, 2013, 11:14:02 am
Quick google search came up with this:
http://www.instructables.com/id/Wireless-upload-program-to-Arduino-without-USB-cab/
http://www.ladyada.net/make/xbee/arduino.html

But why not have all the game modes already inside the arduino and just pick the relevant one? No need to actually program it for every game.
253  Using Arduino / Project Guidance / Re: Outdoor enclosure recommendations on: September 04, 2013, 08:49:27 am
It sounds to me as the water you see condensing is not coming from outside, but is inside from the beginning. If you seal your container in a warm, relatively moist environment, when the container gets colder, relative humidity inside will rise, even though absolute amount of water remains the same. If the temperature drops enough, some water will condense.

If you think you can get a good seal, you can try purging the inside with some canned air, which is dry.
254  Using Arduino / Project Guidance / Re: Need Some Advice On Simple Robotics Project on: September 04, 2013, 12:42:17 am
I suppose this is some competition? Do the rules state that there absolutely has to be a deployable bridge, or do you just need to cross the gap and you thought the bridge would be a good idea?

If the rules allow it, it could be done without the bridge.


When the robot reaches the gap it stops, servos deploy the "training wheels", lifting entire robot. Extending arms are just over 40 cm long so they can reach over to the other side. Once over the gap, arms are raised and the robot continues normally. At least one arm would need to be powered (wheels spinning).
255  Using Arduino / Project Guidance / Re: Need some advice on a Electronic Door Lock on: September 03, 2013, 01:30:29 pm
Well, you should start simple. Go through Blink example just to get a better understanding of what is going on and the program structure, then you might consider doing the button example, to see how is that part done. I assume you will want a keypad, so look at button multiplexing. There are several significantly different ways to do it. Look around, pick the method you are most comfortable with. You'll also need a servo for your lock, so you should take a look at that as well.

When you are done with that (it could take you a few days) you might even be ready for your final project, the actual door lock.
But in general, Arduino platform is very beginner friendly and the online communities and resources are vast and full of information.
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