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    Question(s) Re: MosquitIO Pan & Tilt Microcontroller twitchy

    Hi flemster:

    I don't know anything about your kit but I do control servos using PICs. There are two things that can make them twitch.

    1) If you don't put a 220 ohm resistor in the signal...
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    Re: i want to start...

    Hi:

    You can give http://diyrobots.webng.com a try.
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    Re: Polling vs Interrupt-driven Architectures

    These are your statements:

    "Why would you want to wast the code space/time to pull a dozen input signals(as an example) when they could all be on interrupts?"

    "It has nothing to do with...
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    Re: Polling vs Interrupt-driven Architectures

    I see we are back to this again.

    "Seems the subject is moving far afield but I'd like to point out a case where interrupts are definitely prefered over polling.

    Multiple intermittent input...
  5. Re: External forces pushing servo off holding position

    Hi:

    "How does one deal with a situation where you have external forces pushing a servo off of its holding position- in particular, would this lead to servo motor burnout (or wiring meltdown)? "
    ...
  6. Project Re: Non-Tech needs help with a project and willing to pay

    Hi mhamilton :

    I work for $30 per hour. I'm not going to give you a price for the project because you haven't given enough info.

    "only requirement is that very accurately time the duration....
  7. Project Re: Non-Tech needs help with a project and willing to pay

    HI:

    Sure, what does it pay? What kind of display do you want. Is this a one of a kind item. You don't say that it needs to know the weight of the object, so why the pressure sensitive pad?
    ...
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    Re: Selecting Components for DIY Robotic Arm

    Hi tikka308:

    I am not a machinist. So I have to buy ready made parts. I tried making motor in joints human type arms. I also tried motors in base belt human type arm. As soon as you try to get a...
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    Re: Selecting Components for DIY Robotic Arm

    Hi:

    Hobby type servos would NOT work for what you want to do. You have to make the servo free running. Which can be a pain. There are some that are free running but not many and the motor inside...
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    Re: Remote Control? Animatronic

    Hi Steam:

    I took a look at the video. Are you trying to get this "robot" to walk or just slide forward? If you are trying to get it to walk then I don't think you have a chance to get it to work...
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    Re: Remote Control? Animatronic

    Hi SteamAutomaton: If you need one of a kind controller for your project, let me know. I have made servo and motor controllers that have used IR, VEX and serial for inputs. I really can't see how...
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    Question(s) Re: PDA Controller robot design questions

    Hi:

    There is no way that your PDA can control everything over a serial port. You answered your own question. Your PDA needs to talk to a controller that runs the motors and sensors. I have...
  13. Thread: New Member

    by Al1970
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    Discussion Re: New Member

    Hi RGordon: I have been working on many size robots and I also have one that is 6 ft tall also. I use a forklift type arm. I don't know how big your motor that you need can be. I used a wheelchair...
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    Project Re: New Post For Fresh Start On Robot Butler

    Hi:

    I know the people here are going to bite my head off for saying this but I think you are going too high tech. You are spending hundreds of $ to run 4 motors ! You have 100,000's more computer...
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    Re: Polling vs Interrupt-driven Architectures

    I would be nice Adrenalynn if you stop trying to change what I said. I said "The way SOME parts of the brain works, NOT analog. See the word "some" not "all"

    As far as the PC goes, you left out...
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    Re: Pic servo control question

    Sorry but I have to disagree with just about everything say. Adrenalynn and Inxfergy you are trying to twist everything in my write up on using polling or interrupts. Nowhere does it say I hate...
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    Polling vs Interrupt-driven Architectures

    [Moderator Note: I can't insert a post or reorder them out-of-date. This thread was split from here . No big deal, it just needed its own thread. For any reference that doesn't make sense,...
  18. Thread: LIDAR Round 2!

    by Al1970
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    Discussion Re: LIDAR Round 2!

    Hi. I have to go with Adrenalynn on this. I put together a very cheap system just to play around with. I wanted to see if I could build something better than the Sharp IR range finder for about the...
  19. Re: Using wheelchair motors: Is there a solenoid???

    Yes, it is a brake. Take off the cap in the back of the gearmotor. The brake can be taken off by unscrewing a few long screws that hold the coil and plate. Be carefull because there will be a spring...
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    Question(s) Re: Sensor For Person Detection

    Hi Adrenalynn:

    That's what I wanted to know.

    Thanks,
    Al
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    Question(s) Re: Sensor For Person Detection

    Hi Adrenalynn:

    Since you have used thermopiles before; would they be able to tell if a person was in a room where the temperature was 78? I have tried an IR thermometer with no luck.

    Thanks,...
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    Re: Wireless Control

    Hi:

    I use a "VEX" transmitter which you can pick up on E-bay for $20 to $30. I send the signal to a PIC which then can control up to 8 motors. There more info on my site.
    ...
  23. Question(s) Re: How do I cause a dc motor to hold itself at its current position?

    Hi lnxfergy:

    "Isn't that pretty much everyone above said?"

    No, everyone wants to make the motor act like a servo. A servo takes power at all times and if it has to hold an object for...
  24. Question(s) Re: How do I cause a dc motor to hold itself at its current position?

    Just put an encoder wheel to the motor's shaft and it's positional. No reason to make the project harder then it has to be.

    Al

    http://www.geocities.com/robotsandyou/
  25. Question(s) Re: How do I cause a dc motor to hold itself at its current position?

    Hi:

    I don't know what you need the motor to do but I think you and everyone else is going about it in the wrong way. Buy a used wheel chair motor. They are gear down a little, so they are easy...
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    Discussion Re: VEX robotics, anyone know about it?

    Hi:

    I use bits and pieces from VEX to make robots. I am sorry they didn't make all metal gears like they said they would.

    Al

    http://www.geocities.com/robotsandyou/
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    RC & Serial Servo Controller Kit

    The Features Of The Servo Controller

    The kit comes with a prototype board, servo controller
    chip, jack, wire and all the other parts you need. The
    board is voltage regulated so it can be...
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    Question(s) Re: 5v power supply cuasing noise on speakers.

    Hi:

    You answered your own question. You know it is the power supply. Audio chips are not like digital chips. Audio chips are made to amplify. So noise on the power rails is going to be amplify....
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    Digital Servo Specs?

    What is the pulse width and time between pulses when using a digital servo? Can't seem to find the info anywhere on the net.
  30. Thread: Robot With Arm

    by Al1970
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    Re: Robot With Arm

    Hi darkback2: Yes, it cost more than $100 to build.
  31. Thread: Robot With Arm

    by Al1970
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    Re: Robot With Arm

    Thanks 4mem8 & darkback2. Is it a junkbot? It more of a "kitchen sink" bot. The cardboard is from cereal boxes. The pads on the fingers are from sponges. The small fingers are made from paint...
  32. Thread: Robot With Arm

    by Al1970
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    Robot With Arm

    Just got done the other day testing out my new robot. It is made mostly from wood and cardboard to cover the plywood. It is a good design for people like me who don't have the big tools like mills...
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    Buy The Motor Interface Chip

    Buy the chip used in the "How To Radio Control DC Motors Cheaply" article on
    http://robotics.scienceontheweb.net/index.htm
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    How To Radio Control DC Motors Cheaply

    For the people who don't know what a "VEX" is. It is a company that sells robotic parts and kits. They sell a "VEX" transmitter and receiver on their site for $129.99 but you can get a "VEX"...
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