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1  Using Arduino / Project Guidance / Re: Wireless datalogger ?? on: Today at 07:15:04 am
can an xbee operate in tx mode only so it does not need to find the rx before it transmits ?
No. Point to point XBees need to associate before they can transmit. The transmitter (car) needs to be able to transmit to the receiver (pits?), and the receiver (pits?) needs to be able to transmit to the transmitter (car).

2  Using Arduino / Project Guidance / Re: Wireless datalogger ?? on: Today at 07:12:15 am
the information could be very valuable to a competitor !!
If they stole your car, too. Knowing what g-forces your car is encountering/resisting seems useless information without knowing HOW you are managing that.

Knowing what RPM you are at? How is that useful?

There are many ways to get the speed of a car on a track. You can hardly expect to keep that a secret.
3  Using Arduino / Programming Questions / Re: Sending Data over Serial Interrupted by Stepper on: Today at 06:51:05 am
Is there any way to have the motor keep rotating in the background while waiting for serial data to arrive?
The Arduino does not have foreground and background processes. So, no.

On the other hand, the arrival of serial data is buffered, so you do not need to devote a lot of resources to reading it (as long as you read the data often enough to keep the buffer from overflowing).
4  Using Arduino / Programming Questions / Re: What is wrong with this code??? Can somebody please help me? on: Today at 06:43:37 am
The error I am getting says 'G0_DEVICE' was not declared in this scope.   ???What does this mean and how can I fix it?
It means that G0_DEVICE is not defined where you are trying to use it. Why do you think it is?

Perhaps you mean something like Group0::G0_DEVICE.
5  Using Arduino / Programming Questions / Re: How to detect new WifiClient? on: Today at 06:38:20 am
I'm asking for you to tell me how.
The WiFi library comes with client and server examples. They show you how.

Now, when I tried it for the first time, it worked perfect. ... Henceforth, how can I make my arduino to serve more than one request?
Sure sounds to me like you want help with some software that you have already written. If not, then forget I said anything.
6  Development / Suggestions for the Arduino Project / Re: Arduino CNC PCB Plotter (Need Ideas) on: Today at 06:34:55 am
is it possible to use sdcard with G-Code file on it and will be loaded in arduino to perform the operations in the plotter without using a software in the PC or PC?
Should be no problem. The drill/mill doesn't care where the data came from.

7  Using Arduino / Networking, Protocols, and Devices / Re: Which module to use Arduino + Android on: Today at 06:33:06 am
As it comes to indoor location does have the possibility of using GPS.
Really? Do you have your own satellites inside?

I wonder what kind of sensor can use the Arduino to send this signal
Say what? Sensors don't send signals. Sensors respond to requests. Radios send things.

Had thought of Zigbee modules but I read that Android can not communicate with him

so I thought I bluetooth or wireless modules.
Well, XBees are wireless modules, and I thought we'd already ruled them out since the Android can't read them. Or most other wireless modules, either.

The idea is to get the location through triangulation measurement and signal modules.
The location of what? Triangulated relative to what?
8  Using Arduino / Project Guidance / Re: Wireless datalogger ?? on: Today at 06:23:39 am
can you mix a weak and a powerful xbee ?
Like putting a rubber band in place of a chain link. Yes, you can do that, but why would you? If the "powerful" has a range of 2 miles and the "weak" one has a range of 12 feet, then when used together the range is 12 feet.

is the xbee a secure method of transmission ? can somebody snoop on the data being transmitted ?
Relatively, yes. And probably. But, if you are using API mode, then it could be challenging to make sense of the data. If you use AT mode, you can encrypt and decrypt the data using whatever methods you like.

basically i want to transmit rpm g force and speed
And this needs to be secure? Paranoid?
9  Using Arduino / Programming Questions / Re: How to detect new WifiClient? on: Today at 06:14:20 am
I couldn't attach the code
But, you still want us to tell you what is wrong with it.

10  Development / Suggestions for the Arduino Project / Re: Multiple Stack on Arduino YUN on: Today at 06:12:07 am
1) Is it possible to use multiple shields simultenously working  on "Arduino Yun"  where two or more  shields sharing the same pins.
Depends on whether the shield demands exclusive use of the pins. A motor shield pretty much has to. An SPI shield should not.

11  Topics / Robotics / Re: Robotic punch on: Today at 06:04:42 am
the red color is the path the puncher takes and it can punch and retract back based on my command.
I don't understand your use of the term punch. Perhaps a different term is in order.
12  Using Arduino / Programming Questions / Re: Individual servo control using flex sensor readings on: Today at 05:56:48 am
what should i do instead of writing 0-9 to the servos.
What are you sending? You read an analog sensor, which returns a value in the range 0 to 1023. Then, you map that to a range of 0 to 9, which you then send as '0' to '9'.

On the receiving end, you read '0' to '9', and assume that they mean something to the servos. OK. What does '5' mean to the servo?

Since the servo can move through a much larger range than '0' to '9', one has to wonder why you are sending '0' to '9'.

Use 0 to 255 (or 180) as the to range in the map() calls. Then, use Serial.write() to send the data. Then, your receiver code will do something more like you expect it to.
13  Using Arduino / Programming Questions / Re: Individual servo control using flex sensor readings on: Today at 05:34:48 am
i thought that Serial.flush gets rid of the extra data that might come in from the serial.Read that isnt needed
If you are still using 0022 or 0023, that is correct. If you are using any version released in the last couple of years, Serial.flush() blocks waiting for all pending OUTPUT data to be sent. Not terribly useful for you, since you never send any data (from the receiver).
14  Using Arduino / Programming Questions / Re: small help with HTML commands on: Today at 05:32:46 am
***Note that this is speculation on my part but it seems logical.
It is. One caveat, though, is that each client.print() or client.println() call results in one or more packets being sent. So, something like reading a file, one character at a time, and sending that character to the client, will result in a slow response. Minimizing the number of client.print() calls is a good thing, as long as the code remains readable and doesn't waste memory.
15  Using Arduino / Programming Questions / Re: Use VB.NET with USB cable to control a Arduino that have a LED on: Today at 05:27:51 am
The ConnectSerial() function opens the serial port, which resets the Arduino. Waiting for it to reset before talking to it is not just a good idea.

Does the SerialPort_DataReceived method ever get called?
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