[QUOTE=Alcapwne;33547939]How do I use a wireless webcam underwater then?[/QUOTE]
I think the signal not working is the least of you issues.
What I mean is, I'm making an underwater ROV and I need it to be wireless as far as possible, but I need a video feed. What I'm currently gonna do is have a floating platform with the transmitters and receivers to operate the Arduino which will control the motors and stuff, but I need to still have the webcam feed to a PC - why can't I literally just extend the transmitter bit by adding a wire in?
[QUOTE=ruarai;33549102]Because when they transmit it, you can't just put that into the other end. You MIGHT be able to do a wire before the transmission, but you would have to be lucky, and know where it is.[/QUOTE]
Yeah that's what I mean, find out which part of the webcam innards is the transmitter and then just extend it with a wire but keep it connected to the same place on the PCB
[QUOTE=Alcapwne;33549205]Yeah that's what I mean, find out which part of the webcam innards is the transmitter and then just extend it with a wire but keep it connected to the same place on the PCB[/QUOTE]
It's not going to work.
Buy a camera with a CMOS sensor that outputs a PAL or NTSC signal and feed that into a video transmitter.
Still your going to have a hard time getting any significant range.
[img]http://i54.tinypic.com/2ex26gh.png[/img]
4 of these lasers für 3 dollars on dealextreme. I didn't expect much, but they make a very nice dot with almost no noise around it.
The Ben Heck Show does some awesome stuff with Arduinos.
[url]http://revision3.com/tbhs[/url]
[QUOTE=Alcapwne;33547939]How do I use a wireless webcam underwater then?[/QUOTE]
You wouldn't be able to(well atleast not to a useful point), water refracts as well as blocks the RF signal.
[QUOTE=DrLuke;33549257][img]http://i54.tinypic.com/2ex26gh.png[/img]
4 of these lasers für 3 dollars on dealextreme. I didn't expect much, but they make a very nice dot with almost no noise around it.[/QUOTE]
What's the power output on them? and the voltage? And the range? 8)
[QUOTE=Chryseus;33549250]It's not going to work.
Buy a camera with a CMOS sensor that outputs a PAL or NTSC signal and feed that into a video transmitter.
Still your going to have a hard time getting any significant range.[/QUOTE]
Acoustics travel well in water, but good luck getting any bandwidth out of it.
I think you can probably get a 100kHz (or higher) carrier wave, and with enough encoding power you could probably compress a video stream to like 32kbit/s, so it'd be exceedingly difficult, prohibitively expensive, and look like absolute crap, but it's possible [i]in theory[/i].
Realistically, though, your best option is to just have the thing tethered with a big fat cable to send signals over. Trying to get any signal through water is a pain in the ass. And you might even have problems with that, as the water (particularly salt water) will act as the other half of a giant capacitor.
[QUOTE=LoneWolf_Recon;33551215]What's the power output on them? and the voltage? And the range? 8)[/QUOTE]
2~5 mW, 3V, what range do you mean? If it's the range of the laser, I'd have to guess maybe a hundred meters.
[QUOTE=toaster468;33550525]The Ben Heck Show does some awesome stuff with Arduinos.
[url]http://revision3.com/tbhs[/url][/QUOTE]
He's also a dipshit, he copied Afrotechmods, [url]http://www.youtube.com/watch?v=6sxnma4btrg[/url]
Has anyone heard of [URL="http://www.nerdkits.com/"]NerdKits[/URL]?
[QUOTE=Vi3GameHkr;33560592]Has anyone heard of [URL="http://www.nerdkits.com/"]NerdKits[/URL]?[/QUOTE]
Yes, they are basically just an AVR with a programmer and some other parts.
Has anyone heard of [URL="http://www.parallax.com/propeller/"]the Propeller chip[/URL]? Is it good?
[QUOTE=ddrl46;33563324]Yes, they are basically just an AVR with a programmer and some other parts.[/QUOTE]
It actually isn't that bad, due to the bootloader, one doesn't need to buy a real programmer, and that makes this very easy and cheap to start with. Atleast in theory, they of course charge horrendous prices. (14$ for a breadboard, atmega168, 16MHz crystal, and a 0.1 uF cap)
[QUOTE=DrLuke;33564867]It actually isn't that bad, due to the bootloader, one doesn't need to buy a real programmer, and that makes this very easy and cheap to start with. Atleast in theory, they of course charge horrendous prices. (14$ for a breadboard, atmega168, 16MHz crystal, and a 0.1 uF cap)[/QUOTE]
Problem however is that the kit costs more than an AVR with a real programmer and the other parts it comes with.
[QUOTE=Val67;33564657]Has anyone heard of [URL="http://www.parallax.com/propeller/"]the Propeller chip[/URL]? Is it good?[/QUOTE]
I've heard of them, but never used them.
They seem a little bit like a novelty chip. It has an 8-core architecture and all sorts of odd features like dedicated video hardware, but it lacks simple things like a hardware multiplier or interrupts. Arguably both of these features being missing is a trade-off made for multi-core design. Hardware multipliers can easily be one of the largest structures, physically, in a processor, so having eight of them was probably out of the question. Additionally, the need for interrupts is mitigated by the fact that you can actually [i]dedicate an entire core[/i] of the processor to just sitting there and waiting for a stupid pin to change because you have so many of them.
[QUOTE=Alcapwne;33549205]Yeah that's what I mean, find out which part of the webcam innards is the transmitter and then just extend it with a wire but keep it connected to the same place on the PCB[/QUOTE]
You usualy see a somewhat large spiral shape on the PCB which acts as the antenna.
Can't you just run that up to a floating antenna?
[QUOTE=Fatal-Error;33567493]You usualy see a somewhat large spiral shape on the PCB which acts as the antenna.
Can't you just run that up to a floating antenna?[/QUOTE]
I dunno, can I do that?
[QUOTE=Alcapwne;33567841]I dunno, can I do that?[/QUOTE]
I see no reason why not, I did a similar thing with my wireless keyboard and mouse.
The range was shit so I used an old Wi-Fi antenna on it.
[editline]4th December 2011[/editline]
Grab Yenka physics and do some simlations if you are worried about range.
It is surprising how much water attenuates the strength of radio signals.
I'm going to attempt to build a Z80 Homebrew computer, and since EPROM Programmers/Erasers are too expensive for my boot-up code, I'm going to build my own EEPROM Programmer using an AVR, shift registers, and a serial terminal.
[IMG]http://i42.tinypic.com/33u614l.png[/IMG]
This is a lousy schematic I drew, currently writing up some code for the AVR to run. Should I release this once I finish?
[QUOTE=amazer97;33573110]I'm going to attempt to build a Z80 Homebrew computer, and since EPROM Programmers/Erasers are too expensive for my boot-up code, I'm going to build my own EEPROM Programmer using an AVR, shift registers, and a serial terminal.
[IMG]http://i42.tinypic.com/33u614l.png[/IMG]
This is a lousy schematic I drew, currently writing up some code for the AVR to run. Should I release this once I finish?[/QUOTE]
Correct me if I'm wrong but isn't the convention to draw a dot where wires intersect and simply cross lines that don't connect, rather than drawing a hump on them?
Or is that what you mean when you say it's lousy?
You can also draw humps.
I personally prefer humps.
[QUOTE=Trumple;33573658]Correct me if I'm wrong but isn't the convention to draw a dot where wires intersect and simply cross lines that don't connect, rather than drawing a hump on them?
Or is that what you mean when you say it's lousy?[/QUOTE]
I've seen people use both styles, I prefer the humps because it stands out more (especially if you are drawing it out). By lousy I mean I rushed it :v:
[QUOTE=DrLuke;33573777]You can also draw humps.
I personally prefer humps.[/QUOTE]
Me too. [img]http://fi.somethingawful.com/images/smilies/emot-q.gif[/img]
Anyone know of any good beginner schematics for a small Z80 computer with preferably some EEPROM, RAM, and an UART? I'm looking around but I can't find anything that I can build with only beginner's knowledge. I can't find much information on how to program other chips (The PIO, CTC, and SIO) so I'm getting a bit confused.
[QUOTE=amazer97;33574578]Anyone know of any good beginner schematics for a small Z80 computer with preferably some EEPROM, RAM, and an UART? I'm looking around but I can't find anything that I can build with only beginner's knowledge. I can't find much information on how to program other chips (The PIO, CTC, and SIO) so I'm getting a bit confused.[/QUOTE]
Ciarcia's [url=http://www.scribd.com/doc/13388965/Build-Your-Own-Z80-Computer]'Build your own Z80 computer'[/url] is pretty well known, and most of the parts there are either still in production or have direct replacements.
[QUOTE=q3k;33594050]Ciarcia's [url=http://www.scribd.com/doc/13388965/Build-Your-Own-Z80-Computer]'Build your own Z80 computer'[/url] is pretty well known, and most of the parts there are either still in production or have direct replacements.[/QUOTE]
I'll take a look into it, thanks!
[QUOTE=ddrl46;33564932]Problem however is that the kit costs more than an AVR with a real programmer and the other parts it comes with.[/QUOTE]
I would argue, however, that the kit also includes learning materials and various parts so I don't have to take the time to find that myself.. The quality of the learning materials I have no idea about, so I have no say, but it was appealing to me. Thanks for your opinions.
It seems as if the Arduino is a prime choice for a microcontroller though?
[QUOTE=Vi3GameHkr;33600839]I would argue, however, that the kit also includes learning materials and various parts so I don't have to take the time to find that myself.. The quality of the learning materials I have no idea about, so I have no say, but it was appealing to me. Thanks for your opinions.
It seems as if the Arduino is a prime choice for a microcontroller though?[/QUOTE]
The Arduino isn't a microcontroller. It's a dev board and bootloader powered by an Atmel ATMega328 microcontroller.
But, yes, the Arduino a good place to start. Not sure about these 'kits', though.
[QUOTE=Vi3GameHkr;33600839]I would argue, however, that the kit also includes learning materials and various parts so I don't have to take the time to find that myself.. The quality of the learning materials I have no idea about, so I have no say, but it was appealing to me. Thanks for your opinions.
It seems as if the Arduino is a prime choice for a microcontroller though?[/QUOTE]
You can get everything for free on their website:
[url]http://www.nerdkits.com/videos/[/url]
[url]http://www.nerdkits.com/projects/[/url]
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