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Recent content by webmasterpdx

  1. W

    Want to test a Hall Effect Sensor

    Hall Effect sensors Beware of just using the sensor chip itself. It's voltage change can be very small for a large magnetic field, so you'll typically need some amplification. Then, if your sensor is to be used in the real world, you'll either have to build a self calibrating sensor using a...
  2. W

    Could u suggest a best Microcontroller for the data transfer.

    USB OTG OK, I needed to refresh myself with USB for a minute. If you want to build your own instead of the $70 device, then what you want is USB On The GO (OTG). USB OTG is a special protocol designed specifically for connecting USB devices together. It allows them to emulate a USB host...
  3. W

    Could u suggest a best Microcontroller for the data transfer.

    You might take a look at the microchip.com site and their 8-bit parts. They have several USB microcontrollers and they are really cheap ($3 or so). You might need to get 2 such devices. I'm thinking there is one problem here though. If you want a general device, or a device for a specific...
  4. W

    Bicycle Turn Signal

    I think what you are confusing are what drivers are supposed to do if their signal lights are broken. Then, the driver can only use his left hand out the window. Drivers are "Supposed" to know what this means, but most young fellas don't! :-) I think most drivers would find use of the right and...
  5. W

    Bicycle Turn Signal

    Think how you'd turn both on at once if you wanted to add a brake light effect later on. Where that would be useful is when you are biking with others, as typically you are following one another and if someone hits their brakes, the person behind them can clip them. You'd want to turn off that...
  6. W

    Bicycle Turn Signal

    wire When running wire back through the bike.....get an old appliance that someone wants to throw away and see if it has any old cable. Often you'll get a wire holding multiple wires inside it. That way, you are only running a single cable back (this is less fault prone, easier to implement and...
  7. W

    Bicycle Turn Signal

    That switch doesn't look right. I think you wanted to have a rocker switch. If you do this: +---------------------------------------------------- ----+----+ rest of circuit +---------------------------------------------------...
  8. W

    Bicycle Turn Signal

    Sounds like you have a bead on things.... Sorry about the arm. I have injured arms too from half my garage falling on me, so it just hurts to do anything much with my arms (both of them), so I can relate. I think it's good that you are building the joule circuit as it is a good circuit to...
  9. W

    Bicycle Turn Signal

    Much Better Ah, this is different than what I thought you had in mind. This is much simpler. I wouldn't bother trying to complicate it (unless you want it to get fancy) by using a PIC. This circuit can be put on a piece of protoboard, so you don't even need a PCB (unless you are buying it as a...
  10. W

    Bicycle Turn Signal

    PIC vs 555 A PIC is about the same size and probably not much more expensive than a 555 timer. It has an internal clock. I think the one I mentioned has an 8MHz internal clock. It has 6 configurable i/o pins, 2 internal timers (fully programmable). 4 lines can be configured as A/D (but there is...
  11. W

    Audio storage and playing circuit?

    Chipcorder alternative. Chipcorder is way advanced for this little project. I presume you want something small and neat. I'm assuming you know electronics.... First, for any sound, your sampling rate needs to be at least twice the highest frequency used. Generally for a simple cheap sound...
  12. W

    Bicycle Turn Signal

    I didn't have time to download the whole project. Would have been easier if there was a diagram or something on that other homepage. However, such a project is so easy in the first place. Here is how I'd do it. 1. 2 buttons on the handlebars either a rocker switch to go right/left or one...
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