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4516  Using Arduino / Project Guidance / Re: Map Builder Robot on: June 06, 2013, 05:09:09 pm
sends data about its position

How does it know its position?
4517  Using Arduino / Project Guidance / Re: Network Monitoring of different computers on: June 06, 2013, 05:07:04 pm
Write locally and read remotely is the better option imo.
4518  Using Arduino / Programming Questions / Re: Two SPI Devices w/ Different Phase on: June 06, 2013, 01:51:51 pm
Adding insult to injury, the design of the standard SPI library makes it impossible to have more than one instance of an SPI interface - any sketches or libraries using the standard SPI library can only ever use the one global hardware SPI interface.
4519  Using Arduino / Project Guidance / Re: Extruder Monitoring System on: June 06, 2013, 01:43:57 pm
Do I need to get a 120v to 5v diode?

Get somebody else to design that part of your system.
4520  Using Arduino / Project Guidance / Re: Network Monitoring of different computers on: June 06, 2013, 01:38:34 pm
Share the log file directory on both servers, and poll the output files from the third computer at regular intervals to see whether they have been updated recently. You could also use WMI to confirm that the Processing application is running if you wanted to, although I would have thought that monitoring the output files would be sufficient. (This would be quite easy to implement with a couple of dozen lines of jscript or similar.)
4521  Using Arduino / Project Guidance / Re: Using an Arduino Wifi Shield with the Arduino micro on: June 06, 2013, 07:20:43 am
This doesn't address your question and may be no help at all, but there are (quite small) Arduino clones with integral WiFi adapters. That would reduce the size (and probably cost) of your installation and enable you to completely avoid this sort of integration problem.
4522  Using Arduino / Project Guidance / Re: how to reverse motor without using switch like automation on: June 06, 2013, 07:12:13 am
i want to reverse motor i mean i want o make some kind of project in which i will give give command in ardunio uno ....when some offset come in its way it change its path ..i know it will done with ultrasonic sensor but i want full guideline so plzz help me

It's a fairly complex project and you don't show any sign of actually having tackled it.

It's quite a common project and I'm sure you will find plenty of examples of solutions other people have created, if you search for them. However, the point of Arduino is that it enables you to create your own projects, not just to copy other people's work. To finish the project yourself you would need to buy/make the vehicle, choose the sensors you're going to use, choose the type/number of motors for propulsion and steering, work out the voltage and current requirements of the motor(s), find a suitable motor driver circuit, learn how to control the motors in software, learn how to read the sensors in software, write a sketch that uses the sensor inputs to control the motors.
4523  Using Arduino / Programming Questions / Re: Parsing data from file on: June 06, 2013, 07:07:01 am
You need to address the RAM space issue - your Arduino has very limited RAM and if you are storing an unknown number of 48-byte chunks of data you could easily exceed it. After writing your sketch you will need to measure the amount of free RAM, work out the maximum amount of data you can store in the remaining space, and decide how you're going to handle the case where you receive more than you can store.

If you are dealing with a lot of data and not doing anything time-critical, it would probably be easier and safer to load the data records from the file as you need them rather than try to store the whole lot in RAM.
4524  Using Arduino / Project Guidance / Re: Video "sensing" Switch on: June 06, 2013, 06:57:17 am
You could use pulseIn(), but it would mean blocking your sketch for the length of the frame in order to measure the pulse length - and I don't think you actually care about the pulse length.

If it was me I'd find out how long the pulse was and what frequency it was expected at, and decide from that whether it was practical to poll for it or use an interrupt to detect it.
4525  Using Arduino / Project Guidance / Re: Motor Shield Alternatives? on: June 06, 2013, 06:54:23 am
Never turn on both relays on the same side of the motor at the same time.

Surely you would only have one relay on each motor terminal, which connects the terminal to either high or low. Unless it's wired wrongly, there should never be any situation where the power supply could be directly shorted through the relays.

It would be sensible to add some flyback diodes across the motor to reduce arcing across the relay contacts as they open.

This approach is probably not a good one if you wanted to use PWM to vary the motor speed since relays don't operate very fast and will wear out if pulsed continuously.
4526  Using Arduino / Project Guidance / Re: Tracing A vehicle using GSM and arduino on: June 06, 2013, 06:45:56 am
What type of Cellular modem for reporting. Kindly give some example.

One that is compatible with the mobile networks available in your location and which supports a data plan within your budget.

http://gps-trace.com/?page=about
It's free web service. Is it helpful for my project?

I have no idea - I don't know anything about that service. Perhaps you should research it and see whether it would be helpful for your project.
4527  Using Arduino / Project Guidance / Re: Stack Ardumoto shields on Arduino on: June 06, 2013, 06:35:37 am
Am i doing something wrong ?

It sounds reasonable but means visualising the circuit and you may not have built it the way I'm imagining it. I suggest you post a drawing showing the connections you've made, and your code.

You should also be able to test the second and subsequent shields by removing the shield beneath them and connecting them directly to the Arduino (via your headers and wired connectors to map the pins). If your logic is correct, they should behave just the same when you connect them directly.

I don't have your Ardumotor shields but on the shields I've used there are various options to derive logic and motor power supplies either from the external power connector or from connections to the Arduino, and also options to power the Arduino 5V supply from the driver board. If you have any options like that make sure you understand them thoroughly and know how all the boards are being powered.
4528  Using Arduino / Project Guidance / Re: Arduino Freezing During Serial Communication [Laser Spirograph Project] on: June 05, 2013, 07:43:45 pm
Is there anyway to keep that from happening?

The reset is triggered by the serial port DTR line going low and pulling the Arduino reset pin down. You can prevent the Arduino from resetting when that happens by connecting a capacitor between reset and ground. It might be better to consider whether you actually need to open and close the port repeatedly - it's not good practice.
4529  Using Arduino / Project Guidance / Re: Help with the MindWave headset. on: June 05, 2013, 07:36:57 pm
It looks as if it uses 'Wireless USB' (Bluetooth?) as the interface so you'd need to provide a compatible wireless receiver. I guess that's what the Neurosky solution is giving you, and if that's their recommended solution for connecting it to an Arduino then I would assume that's the simplest solution. You could always ask on their developers's forum if you don't believe their solution is the easiest way.

If you don't need to connect it *directly* to an Arduino then other options may be possible - it seems as if the device presents a virtual serial port at the PC, and it would be easy enough to either create an application to read that and act as a bridge to the Arduino, or simply loop that serial port back out to the Arduino's serial port.
4530  Using Arduino / Programming Questions / Re: Upload Arduino sketch (HEX) through the internet / Local LAN on: June 05, 2013, 04:56:26 pm
I seem to remember reading a post from somebody who was talking about work in progress to make it possible to upload sketches via Ethernet using an Ethernet-capable bootloader. I can't remember the details - did I make that up?
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