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    Core electrical engineering classes

    I am getting a MS in computer science and will be finishing up soon. I have started looking around for possible employers. I would love to do something in the field of robotics. Preferably for a...
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    Discussion Re: Python Project Sharing and help Thread

    I duno, that Teflon coating my ChemE friend laid down in my kitchen to "make cleaning it easier" is pretty slick. Its a damn death trap really... :tongue:



    (I wish... I bet it would be really...
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    Re: Surge protector grounding

    There is no for anything else in the house to be shorting to. Everything in the house is two pronged and there is no ground to be found. Thats why I wanted to ground the surge protector to the cold...
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    Re: Surge protector grounding

    When the surge protector is powered on is when I get the voltage difference.

    By leaky ground, do you mean that one of the devices on the surge protector is leaking current to ground?

    I am...
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    Surge protector grounding

    A while ago, some of you may recall, I posed about my TV possibly getting fried by poor grounding and a passing electrical storm.

    I was asking around, and it seemed a possible solution would be to...
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    Cutting an LCD ribbon

    Ok, so I am trying to make a DIY projector for my TV on the cheap using an overhead projector and an old LCD panel from a LCD monitor.

    I took apart the monitor and I am almost there but found that...
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    Re: Grounding and lighting storms, oh my

    Thanks Adrenalynn,

    It wasn't a direct hit, but it was somewhere in the city. I had unplugged the computer but forgot about the surge protector with the TV.

    So during the day, the power...
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    Grounding and lighting storms, oh my

    So we had a lighting storm a few days ago. I am reasonably sure it fried my TV. I pulled the back case off and there is a black charred mark on the circuit board going around a capacitor into a black...
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    Re: Solar NiCad charging

    I guess the current is what I am a little confused about.

    I assume the battery acts as a resistor as it is being charged (?) but I cant find anything that talks about the behavior of a battery as...
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    Solar NiCad charging

    I am wanting to set up a circuit to charge two batteries via a solar cell and I can't find a whole lot of good information on it.

    I found this:
    ...
  11. Thread: Xbee socket

    by Resilient
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    Xbee socket

    I got a pair of Xbees and a USB connector for one. I was planning on just using an IC socket for the other but now find that it is not a standard pin spacing. My college electronics shop doesn't have...
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    Re: Interrupt handling

    Thanks Fergs,
    I am using it for quadrature encoders and I will set it up with external hardware interrupts. But I will be doing some stuff with timers soon and know there are going to be some bugs...
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    Re: Interrupt handling

    I was reading through the mega640 data sheet and it looks like there are two kinds of interrupts, some that throw a flag and others that dont.

    I am a little confused as to which is which. It...
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    Re: Interrupt handling

    Thanks for the information. Its kind of what I had guessed. I was just sort of curious if there were a better way from a theoretical standpoint.

    And yeah, it's AVR.

    Thanks!
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    Interrupt handling

    I am trying to get rid of a little but in my wheel encoder code dealing with interrupts.

    I have an int that keeps track of the number of encoder bars that have passed that is updated by an...
  16. Question(s) Re: RoboRealm and Axon serial communication issues

    In case anyone happens to stumble upon this thread later, Roborealm resolved the issue. A couple days after I emailed them they released a patch fixing the serial communication with the Axon.
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    Re: Wallwart specs

    Thanks for the help. I will need to regulate the voltage. Just wanted to make sure I didn't need to worry about amperage (other than ensuring I can supply at least as much as the converter could)
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    Re: Wallwart specs

    Yeah, I am trying to go the other way. I am going to hook the camera up to a 12v batter instead of the wall wart.

    I just wanted to make sure that it wont kill the camera if I hook it straight to a...
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    Wallwart specs

    So I am trying to mount a wireless surveillance camera on my robot.

    What I am confused about is what I need to provide it for power. The DC converter that it would typically use is 12v and 2.5...
  20. Question(s) RoboRealm and Axon serial communication issues

    I have asked at RoboRealm and at SocietyOfRobots and have gotten little help, so I figured I would try here.

    Has anyone gotten serial communication to work with the Axon (using the USB port) and...
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    Re: QRD1114 white vs black detection

    Problem sort of solved.

    Turns out, black paper backdrops, actually really reflective when it comes to IR. Who knew.

    Like as good or better than white paper. Totally works fine on black paint....
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    QRD1114 white vs black detection

    I am trying to hook my QRD1114 up to my Axon micro controller to tell white from black on a surface. Right now, if it is far away from a surface, it detects nothing and if it is close it detects the...
  23. Re: open source sound identification and location

    Alright, so a possible solution is to land, listen for noise, then go again. So this will eliminate the need to filter the white noise.

    Ill be learning as I go. Right now I am not knowledgeable...
  24. Re: open source sound identification and location

    Unfortunately I don't have control over the sound being emitted. Essentially I know there will be a beep every so often (dont know the frequency of the sound or the frequency of the beeps). I need to...
  25. open source sound identification and location

    Does anyone know of any open source software packages for picking out particular sounds (Like a beep that happens every 2 seconds) out of a lot of background noise?

    Thanks
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    How to deal with unexpected stops.

    Here is the situation I am running into.

    I got a PI velocity loop that works pretty well.

    But occasionally due to a sensor glitch or something, it stops. Especially when going slow.

    My...
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    Re: Help understanding a diagram

    I am confused because everything I circled in red looks like a ground. So where is the current coming from?

    Sorry for being a total noob. :( I am sure there is something simple I am missing, but...
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    Help understanding a diagram

    I am trying to build a circuit similar to the HexPummer from solarbotics.

    I attached the diagram from the pdf. What I am confused about is where the the ground and where is the source voltage in...
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    PI loops and feed forward

    I am working on keeping my newfangled wheel encoders from making wild speed oscillations and was looking at some example code.



    err_R = (req_speed_R - enc_speed_R); // calculate...
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    Re: Trinity Fire Fighting Robot Contest

    I wont have one for this event, but I am in the works on one for Robogames which uses nearly identical rules. I am rewriting some code for it right now to make it actually manageable.
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    Re: Axon hardware interrupts, help!

    Damn I was caught! :tongue:
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    Ginormous computer controlled model world

    http://www.miniatur-wunderland.com/exhibit/

    11k ft^2 of computer controlled trains, cars and boats. The technology page has some cool info on the cars.

    Edit: I lied, the boats sound cooler.
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    Re: Axon hardware interrupts, help!

    Thanks for the idea. I wish the AVR documentation was better, but there just inst much info on the rprintf function. I know %ld is not a possible option though. So it may just be a limitation of the...
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    Re: Axon hardware interrupts, help!

    Ok, I am unhappy now.

    Why does:
    rprintf("Left:%d Right:%d\n",left_clicks,right_clicks);

    not actually print out left_clicks and right_clicks? It only prints left_clicks and some other...
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    Axon hardware interrupts, help!

    I have the following code:



    volatile int32_t left_clicks = 0;
    volatile int32_t right_clicks = 0;
    const int WHEEL_UPDATE = 64;


    ISR (SIG_INTERRUPT4)
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    Re: Societyofrobots website trouble

    Anyone? Its kinda important to me because that's where trossen links to for information on the Axon.:sad:
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    Re: Wheel position sensor positioning

    Yeah, the jig wont work with my setup. I am trying to mod it to fit a setup not driven by servos.

    I am just trying to figure out how accurate I need to get it. Like do I need to get a custom jig...
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    Wheel position sensor positioning

    I got wheel watchers and I am wondering how important it is to have them exactly centered on the axis of rotation.

    Essentially, I can easily make it fit if it is 1/32" off center. I know if it...
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    Societyofrobots website trouble

    My Avast! virus protection software is telling me that societyofrobots.com has a JS:Redirector-E trojan. Anyone know anything about this? Has their site been hijacked? Is my anti-virus just flipping...
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    Re: How to use 3mm hubs

    Thanks for the heads up on the cutting I was going to use a dremel.
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