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  1. hevans1944

    Microcontroller controlled by pushbutton for LED flashlight

    @BobK: I was aware of the in-circuit debug limitations (this baseline series doesn't have enough memory to support a debug executive) of the PIC10F200/2/4/6 series, but I am not ready to invest more money for a header board that will emulate this series and have limited usefulness for more...
  2. hevans1944

    Interrupt Handling

    Sounds to me like you need some test equipment, such as a CAN bus monitor, to see what is actually going on.
  3. hevans1944

    Interrupt Handling

    That sounds good. Just make sure both the Freescale controller and the ECU implement a CAN flow-control protocol: each tests the check-sum on each received message, asks for a re-transmission if there is a check-sum error, and that both have adequate speed to process each message received...
  4. hevans1944

    Interrupt Handling

    What are you transmitting the CAN messages to? Is this a full-duplex or half-duplex communications link? Does the receiver of the CAN message implement either software or hardware flow control? Do you have the capability to implement either software or hardware flow control? Interrupts are...
  5. hevans1944

    Safe distance to look at a 950mn 5w Infrared LED from?

    What does this even mean? I don't see "5 metres" mentioned anywhere. The datasheet (scroll down to the bottom of the page you linked) for your infrared LED says it produces a maximum of 1000 mW for 10 W power input, an optimistic 10% efficiency. Infrared is tricky. Most plastics are transparent...
  6. hevans1944

    Microcontroller controlled by pushbutton for LED flashlight

    Last night I ordered ten more PIC10F206 and ten PIC10LF320, both in PDIP packages, from Digi-Key via Priority US Mail. They should arrive here next Monday. In the meantime, I discovered the software simulator for the PIC10F206 in MPLAB X and took it out for a spin. Another learning curve to...
  7. hevans1944

    Safe distance to look at a 950mn 5w Infrared LED from?

    This looks like an infrared illuminator for a night-vision application. As a general rule, never look directly into a solid-state light source whether it be diode laser or LED. If there is any doubt about it, wear a set of protective goggles appropriate to the wavelength emitted. Vision is a...
  8. hevans1944

    Rest in Peace, Kris

    I have not been a member of this forum very long, and stumbled across it almost my accident. One of the people who kept me coming back was Kris. His willingness to delve deep into a user's problem and come up with a complete design solution, including professionally drawn schematics and Bill of...
  9. hevans1944

    Electronics engineering

    When I started my career it was mandatory that I study a foreign language. At that time Germany was a rapidly rising star in engineering, so I said to myself "Was ist los mit mer?" I had studied (and failed to learn) German in high school. Same-o same-o in college. I was destined to be an...
  10. hevans1944

    Electronics engineering

    Never tug on Superman's Cape.:)
  11. hevans1944

    Microcontroller controlled by pushbutton for LED flashlight

    Thanks, Adam. Apparently MPLAB X has a software simulator too, but it needs to be enabled under "Hardware Tools"... go figure. I will go upstairs to the HP laptop and give it a go. Maybe I should also join the Microchip forum, wherein I found an ancient post that said how to enable the software...
  12. hevans1944

    Microcontroller controlled by pushbutton for LED flashlight

    Adam, It is so frustrating trying to program and test a microprocessor when all that is visible are four I/O ports. MPLAB X can't even show the contents of the registers, or at least I haven't found out how to do this. I'm just about 100% certain it shows the program memory contents after doing...
  13. hevans1944

    chassis

    There is no such thing as the best chassis. You use whatever suits your design, which means deciding between metal and plastic, aluminum or steel, factory made or home made. A lot depends on what you want to mount on or inside of your chassis. Locomotive robots probably need a fairly sturdy...
  14. hevans1944

    Fail-Safe Latching Relay

    An ordinary SPST relay with normally-open contacts performs as you describe. You wire the contacts between one end of the coil and the power lead to the coil. The other power lead goes to the other end of the coil. Until power is applied, the relay coil remains de-energized and the contacts are...
  15. hevans1944

    Microcontroller controlled by pushbutton for LED flashlight

    Lest I get off into left field here (American baseball term), it appears that Adam is now using a PIC10F320, or possibly a PIC10(L)F320, instead of the original PIC10F200 that is mounted on the prototype board that Jeff sent us, and that I have been afraid to mess with using MPLAB X and the...
  16. hevans1944

    Water Level Sensor

    I bet dollars to donuts that the OP has yet to look in the tank for the missing float.
  17. hevans1944

    DRSSTC: Dual Resonant Solid State Tesla Coil

    Here is a link to the forum Terms and Rules, which can also be found at the bottom of each page. I don't think anything is forbidden when discussing high voltage and vacuum experiments as long as all parties to the discussion are knowledgeable and competent in those areas, as obviously you are...
  18. hevans1944

    DRSSTC: Dual Resonant Solid State Tesla Coil

    You could probably (with a lot of effort!) remove the nails one-by-one and replace them with nylon screws. Are you member of any of the Tesla Coil Web Rings? It is always a pleasure to see what creative folks can accomplish with modern technology applied to 19th Century resonant transformers. I...
  19. hevans1944

    disconnect switches

    Best way to make sure the engine "doesn't start up for any reason" is to remove the spark plug, maybe lock it away in a tool box or bank safety deposit box.:D
  20. hevans1944

    disconnect switches

    Oh. Well, a knife switch will do just fine for that. Or maybe an automotive fuse block you can mount near the spark plug and insert a fuse (just about any size will do) into when you want to "ground out" the spark plug. I am thinking of the newer type fuses that have a little plastic handle and...
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