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16  Forum 2005-2010 (read only) / Interfacing / Re: Making arduino wireless! on: November 05, 2010, 10:24:24 am
The range specified is line of sight, and i want a baud of 9600. The arduino is reporting voltage, and GPS Sentences from a 24 volt electric car
17  Forum 2005-2010 (read only) / Interfacing / Making arduino wireless! on: November 05, 2010, 07:27:28 am
I'm trying to get an arduino to interface with a serial computer application i wrote. The application reads information from any serial (COM) port on the computer, and works fine (It will already read things from my arduino while it's attached with a USB wire) However ineed it to be able to interface with the computer wirelessly over a range of +300 meters (So bluetooth is out of the question) how will I accomplish this? It can be one or two way, whichever, but ideally I need the cheapest, simplest solution. Can anyone help with what parts I will need, how to put them together and where i can but them? I'm using an arduino Nano (NOT pro-nano) Thanks!
18  Forum 2005-2010 (read only) / Interfacing / Help with wireless application! on: November 04, 2010, 11:05:12 am
I'm trying to get an arduino to interface with a serial computer application i wrote. The application reads information from any serial (COM) port on the computer, and works fine (It will already read things from my arduino while it's attached with a USB wire) However ineed it to be able to interface with the computer wirelessly over a range of +300 meters (So bluetooth is out of the question) how will I accomplish this? It can be one or two way, whichever, but ideally I need the cheapest, simplest solution. Can anyone help with what parts I will need, how to put them together and where i can but them? I'm using an arduino Nano (NOT pro-nano) Thanks!
19  Forum 2005-2010 (read only) / Interfacing / Re: volt, temprature, amps and watt meter on: October 21, 2010, 09:09:46 am

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are you looking to learn how to design such a system or do you just want to build one?
I'm planning on building one, not learning too.
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24V is a bit on the high side for powering an arduino
i'm going to power the arduino from a 9V battery
20  Forum 2005-2010 (read only) / Interfacing / volt, temprature, amps and watt meter on: October 21, 2010, 07:16:54 am
Hi, I'm hoping to use the arduino to mesure a battery's stats - mainly its voltage, temprature, amps and watt's being consumed - while its powering an electric car around a track. I need help with getting sensors for the mesurements i.e. how do i mesure the amps and read it in the programing. I have datalogging code so thats fine. The battery is 24V and i also need it to power the arduino. Can someone please help (submit a circuit diagram / programming snippets) me with this. I particulary need circuits that will give the arduino (through the anolouge inputs) voltage, amp and watt information.

Thanks everyone for helping! smiley
21  Forum 2005-2010 (read only) / Interfacing / Update on: September 01, 2010, 07:45:24 am
Update: also, the RX light flashes briefly just after i send the command, but Thats all that happens
22  Forum 2005-2010 (read only) / Interfacing / FirmataVB HELP!!!! on: September 01, 2010, 06:16:17 am
I am making a model rocket 'launch-box' that ignites a rocket engine from computer control, and then takes a picture through the computers webcam.
I've made the application in Visual basic 2008 and it works well.

Now I have the arduino interfacing to deal with. I'd implemented the Firmata VB Dll into my project, assuming that when the time came and the board was delivered, it would work. I've tested all the digital and analogue pins through arduino's own software and programming language, and they all work. BUT (and here's my problem)

When I try and manipulate any of the Inputs/Outputs in Visual Basic, even on the samples that FirmataVB came with, the arduino gives no response.

Have i done something really stupid, or is this an actual problem? Do i need to download a FirmataVB sketch onto the arduino?

I'm using an Arduino Duemilanove, and on COM 34.
Please help as soon as possible and thanks in advance  smiley
23  Forum 2005-2010 (read only) / Exhibition / Re: RGB Colour Mixer with DS touch screen on: September 12, 2010, 10:06:43 am
I've just made an application that will make using the NDS touch screen with arduino a lot easier. It has a rectangle the exact same size as an NDS touch screen. Basicly, you draw a rectangle using the mouse onto this area, and it creates some arduino code that will execute when you press the touchscreen in this area. You can also save the design of the touchscreen, so you can print it off glue/stick it behind the screen when your using it. The only thing is, I'm not sure if it works because I'm still waiting for a breakout board, but in theory it works, I've used some of the code written here and just made the software work out the coordinates relative to the screen.

You can download it at: http://code.google.com/p/touchscreen4adruino/downloads/list
24  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Help with VIN Pin!!!!! on: July 24, 2010, 03:34:05 am
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Is this part of a school project or something? In other words, how is it that insurance is even involved, let alone dictating something as minor as the switching system used for model rocket launches.

Yes.
The teacher is in-charge of the students, and the insurance says to the teacher that  we need to launch responsibly, and have as much control as possible at all times. This includes control in freak events, such as a misfire, Loss of power, Possible outside variables... the list gos on. That makes it the teachers responsibility to check that everything is fine before take-off, including the launch equipment. If said teacher doesn't check or checks and notices there are relays in the circuit but continues then the teacher was being negligent, and so they could say that in event of an accident the teacher wasn't following the insurance, and so they wouldent have to pay up, like Grumpy_Mike said.
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When I was 12, the concept of "insurance" wasn't even something I was aware of
Its a sad age, isn't it

25  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Help with VIN Pin!!!!! on: July 22, 2010, 11:11:43 am
One and two are together on the keyboard. I am 12
26  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Help with VIN Pin!!!!! on: July 22, 2010, 09:17:19 am
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OK so you have a lot to learn. Insurance companies are NOT really nice people. They are money grabbing bastards who will do anything to not pay out. They do this by not actually covering anything that is likely to happen. Pulse excluding a lot of stuff that they are too stupid to know about.

I don't want to sound all rude, but just because i'm 12 doesn't mean you can call me stupid. I know that insurance people are "money grabbing bastards" because that's who are saying we cant use relays.
The point is I have what I wanted, thanks to Cr0sh, retroleftly and all the others, it may be enough to secure our inovation prize. Thanks!!! smiley smiley smiley smiley
27  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Help with VIN Pin!!!!! on: July 22, 2010, 08:51:19 am
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You are not, by chance a school teacher from england?

No, I'm a 11 year old student.
28  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Help with VIN Pin!!!!! on: July 20, 2010, 12:18:42 pm
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Sorry but that is just rubbish.
I think ist stupid too. But its what we have to cope with. If we did the insurance (Who are being really nice already, letting 10 year olds setting off rockets) would be canceled. But thats irrelevent. the fact is - With a charged 9V battery you can set off the ignitors. All they are are bits of wire with gunpowder on the end (a fuse with some explosive on it). And we use PP3's in our portable ignition sets anyway, so whats to say one wont work now (If it was such aproblem i would've mentioned it earlyer). And even if it didnt work for some compleatly unknown reason, we could just add a bigger battery.

Its OK now i have got somthing from http://www.instructables.com/id/LED-Dance-Room/step2/Circuit-Design/

I'll adapt that diagram to work with what we want...
29  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Help with VIN Pin!!!!! on: July 19, 2010, 11:23:00 am
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I've been told from normally reliable sources that even in England one can obtain transistors locally.  
Yes, we can, its a matter of the part numbers spesificly. I cant exacly go and say I need an NPN transistor and they instantly know what I need based on that small bit of information. I was looking for part numbers ext...

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relays (which I understand are less efficient) are a little easier to work with sometimes, and are more versatile.

Can't use relays for one big reason. Magnets. By law mine wouldn't be allowed to be used because a stray electro-magnetic field could set them all off. also, if two are close together, the one relay could trigger the next. And, like you said - they are terribly inefficient. so no matter how easy they are to work with, its just not feasable. smiley-sad

30  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Help with VIN Pin!!!!! on: July 18, 2010, 05:06:00 am
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Neither of those are acceptable. To activate 9vdc to a load (your igniter) your going to have to have a switching transistor turn on controlled by an Arduino output pin via a series resistor to the base of the transistor. The transistor's emitter is grounded and it's collector lead wires to one side of the load. The other side of the load wires to + battery voltage. We would need to know the igniter's current requirements to properly size the transistor and it's base resistor.

I Now have the correct data:
The ignitors we will be using "At minimum need a 9V batterys voltage and current to ignite" as described on the manufacturers website. Sorry if thats not that much use. But because of this I will be powering the arduino board and LED's on the box with with the USB's power. The Battery to ignite the ignitors will be a 9V battery (Its the cheapest/most avaleable) With that, what type/Model (NPN/PNP > Im not that good with Transistors) of transistors will I need? and if its not too much, where could i get them? I live in england so its quite difficult/expensive to get things from overseas.
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