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  • OT Robot

    This is a bit off topic, but I'll ask anyway. The kids at school have the mobile robot moving. Now we want to do somthing with it. I'm not into "weapons" on the bot, but I would like to transmit Audio/ Video back to a computer or TV. I have an X10 wireless tranmitter/ receiver and camera, but the unit is very directional has a small range, and it doesn't like transmitting through walls. I've been to the X-10 site but it doesn't look like they have anything better. The positive is that it is cheap and it does work.

    I have an old VCR camera that still works well (I would prefer to use this) and I also have a digital video camera that I can use. I also have some CCD survailence cameras (with no documentation) Can anyone recommend a low dollar battery operated transmitter that I can use to transmit the picture from the camera? I would like a range of 500 feet or better and not be limited to line of site operation. I've seen a transmittter on E-bay that fits the bill except it is not battery operated, and I don't have a 500 foot extension cord. Converting it to DC may be an option though.

    I've been to many robot sites but haven't seen what I'm looking for.

    Thanks in advance, Matt

  • #2
    Cell phone and a cpu?

    I lost the site, but a kid genius was building insect type robots with cell phones and cpus. He'd download the new software as needed. He has a camera mounted on each. He was experimenting with fuzzy logic I guess since he was trying to get the computer to make decisions based on outcome.

    I was impressed. I bet we see more of his work in the future.

    David

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    • #3
      Have a look here:

      http://abc.net.au/science/k2/homework/vcrtrans.htm

      There are a number of video transmitters available
      Free software for calculating bolt circles and similar: Click Here

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      • #4
        http://cgi.ebay.com/ws/eBayISAPI.dll...093946738&rd=1

        Looks to have 3/4 amp power requirement.

        Ending about $50 puts it into the cheap range.

        No clue how far it transmits.

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        • #5
          Check with the local radio/tv/satellite stores. There is a product called a video sender that transmits audio and video 500'. When I worked at the satellite shop we used to sell them for about $50.00. They broadcast on channel 14.

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          • #6
            Bernie, The transmitters I've seen that will do 500 feet are 120V AC. I supose I might be able to hack one to see if it is capable of being battery powered. Kids would like to be able to run the bot down the hall and see what's going on from my room X10 and the other CCD stuff I've seen doesn't seem to have the range or they have the line of sight problem. I found one video transmitter on an e-bay auction the fit the bill, but it was AC.

            Evan, didn't see what you were refering to on the site. Some interesting educational stuff, but I missed the transmitters.

            David, the IR stuff is cool. I may add that later. Could be a cool thing to see what goes on at school with the lights off. On second thought maybe not.

            Thanks to All
            Matt

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            • #7
              I have a 2.4 ghz wireless video system. I bought a small CCD Panasonic color video camera for it, and the TX also sends audio. I hooked it all up to my R/C humvee, and drove it around my house via the TV set.
              Now I am not kidding you, All the R/C airplane flying, and everything else I have ever done, NOTHING was as much fun or entertaining as driving that little car thru the house as IF I was sitting inside it. IT blows away any computer sim you have. The Tamiya Humvee I have is 1/12th scale, and gets going up to 15-20 mph, sometimes I was able to open it all the way up in the house, then slam on the breaks make a turn and gun it again.
              I chased my cat around the house.
              Another time I brought the car to work, and I drove it around into people's offices, I could hear them saying, WHo the hell is controlling that?
              THe wireless system I have I think is only 100 milliwatts, I get about 1000ft range straight line, 500 ft about if your shooting thru woods.
              I thought about putting it in one of my airplanes, but mine requires 12v for the TX, and 5v for th camera, makes for unusual power requirements, a DC to DC converter could introduce noise that I dont want.
              THe newer systems the guy sells now are all 5v.

              [This message has been edited by BillH (edited 05-02-2004).]

              Comment


              • #8
                Okay, I wanna.. build one with servos on a tripod, put it into the woods to ambush bambi. Mount it on a small 4 wheeler.

                Imagine.. sitting in the nice warm camper watching bambi stroll by, then machinegunning him. Perhaps I like this ideal better than the rocket launcher I was working on.

                David

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                • #9
                  techtchr,
                  check out www.supercircuits.com, (512-778-6950). If they don't have what you need then it isn't made. They are located just outside of Austin in Liberty Hill, Texas. All kinds of wireless A/V equipment at great prices. I have no affiliation with them but I have bought alot from them as have a number of my friends. Our local Narcs buy quite a bit of their James Bond type goodies for their unsuspecting customers.

                  Comment


                  • #10
                    This is the guy where I got my stuff from, as a note, the stuff he sells is made by Lawmate, so could probably find elsewhere for less.
                    http://www.blackwidowav.com

                    Comment


                    • #11
                      Matt,

                      The point is that an RF modulator is also a transmitter. Just connect an antenna to the broadband output of the modulator, usually 5 to 12 volts powered and you have a transmitter, cheap and simple.
                      Free software for calculating bolt circles and similar: Click Here

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                      • #12
                        Evan,
                        I understood that from the article, but I interpretted it as this might or might not work, but since it involves stuff I already have it is worth a shot.

                        David,
                        I purchased my motor controller from a guy in PA. It runs 12-36 volts. I'm running two 24 volt wheel chair motors I salvaged from the local metal recyler. The unit can be connected to an RC car controller or a Basic Stamp. I'm thinking if you can find a sensor to detect deer scent you could probably hook up the basic stamp and your gun to the unit, and not even get out of your chair while you're sipping the wild turkey. You could watch the bot do the whole thing in front of the big screen.

                        Matt

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                        • #13
                          Woe to the man who wears doe scent in the woods.. HA HA>.
                          I actually have been playing with the model rocket engines.. No real explosive payload since that is illegal.

                          Tech:ie... You should start them kids 3d modeling. It is the future. So far, I hate to say it, cause the salesmen are aggressive butt-holes but the Bobcad looks the best.
                          Kinda stacking primitives to get the basic shape you want, triangles, cylinders spheres and cubes, then stitching them together.
                          I'm learning, but I am a old dog and this is a new trick.
                          ANy experience in 3d modeling is helpful in the way you think. Ayam is a free one, so is animor.. If there is any really sharp kids they need to learn DIrectX instead of the engines.

                          David..

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                          • #14
                            David,
                            We use a 3D modeling package called Inventor. It is put out by AutoDesk. Long story, but I've never had training on it. Everything is self taught. The teacher that teaches it is excellent. They learn the program their freshman year and use it throughout their HS career. By the time I get them into my Sr. Design class, they are usually more proficient at it than I am.
                            The program will allow you to create almost any shape you can imagine, assemble multiple shapes, create orthographic drawings and much much more. Down side is that one industrial seat is about $2000 I think. We have 100 educational seats for far less. It is also a drag and drop file system into our new CAM software(which I'm still learning).

                            You should see the rockets two of my kids drew and then modeled. Along with a floating launch pad. Very detailed. Both are going to excellent Engineering schools next year. I'm very proud of them.
                            Matt

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                            • #15
                              Matt,

                              I found this. It might be what you are looking for. Not quite the range you specified but that might be improved by using a better antenna on the receiver.

                              http://www.smarthome.com/7654s.html
                              Free software for calculating bolt circles and similar: Click Here

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