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  1. hevans1944

    Led bar graph

    And the winner is... @Harald Kapp! Again. Sometimes discrete solutions are better than microprocessors, and this is just the situation where a discrete solution using seven 8-bit shift registers works better. You still might want to add an open-collector buffer at each of the shift register...
  2. hevans1944

    Electronics Moron Needs Help

    Don't youse guys wish ya were Cub Scouts again? With today's technology to "soup up" yer Pinewood Derby entries?:D As a Dad, I enjoyed one year helping to re-build a derby race track that was set up in the basement of a neighborhood church. Neither of my sons were interested in becoming Scouts...
  3. hevans1944

    Detecting horizontal position

    @Bluejets, we may have a language problem here since the OP is from India. Maybe a cultural problem too. After spending the last eighteen of my working years working with and for these people, I can assure you that their view of the world is... different. Perhaps @tarun71gaur is reluctant to...
  4. hevans1944

    Detecting horizontal position

    Still not enough information to understand what your are trying to DO, unless your only problem now is how to "freeze" the display when the rod is horizontal. Presumably you have tried out the tilt switch or switches and now have a "tilt sensor" input to your Arduino which you can use to command...
  5. hevans1944

    How can I bypass a switch on a humidifier?

    Since you are into building stuff, you might try "reverse engineering" that undocumented Chinese POS to make your own driver for the ultrasonic "mist transducer." This is a virtually impossible task for the neophyte builder because there is likely no information about the transducer or the...
  6. hevans1944

    Searching for a 30A 36-42V DC (Emergency) switch.

    Good advice @Minder and @bertus. Plus, most DC contacts are NOT rated for switching inductive loads. A 10H inductor will draw a nice fat, hissing, DC arc with just a few amperes of current applied. That is NOT what you want to happen inside your switch or contactor.
  7. hevans1944

    Why and how is PWM implemented in Field Oriented Control (FOC) ?

    PWM is widely used to implement so-called "micro-stepping" of DC stepper motors. By using a high-frequency (much higher than the actual stepping frequency) PWM current, that has the pulse-width modulated to model a sinusoidal wave form, the quadrature (in space) magnetic fields can be almost...
  8. hevans1944

    Searching for a 30A 36-42V DC (Emergency) switch.

    Try Amazon. At least here in the States they have a large selection of 30A switches.
  9. hevans1944

    Coronavirus transmission prevention device.

    That, plus eventually they will run out of supplies if there is no one outside to deliver any, at any cost. Thus the uber rich only prolong the inevitable. Not willing to believe they would actually get dirt under their fingernails trying to grow food underground in a bunker.
  10. hevans1944

    Detecting horizontal position

    I am gonna make a leap of faith here and assume you meant to write "Read the position..." But we still don't know WTF you are trying to DO with your base plate with a hinged rod attached to it. Can you enlighten us with an explanation, or is this some sort of secret you are withholding for...
  11. hevans1944

    Coronavirus transmission prevention device.

    The rate of occurrence for the Lyrid meteor shower is only 10 to 20 per hour, and this only during the peak that occurred the night of April 21 through the early morning of April 22. The shower continues through the end of the month but with decreasing rate of occurrence. Maybe you should get a...
  12. hevans1944

    Coronavirus transmission prevention device.

    That would be hard to predict, but here in the USA our country has been bankrupt for a long time, depending on investors both here and abroad pouring in cash to finance the interest on our national debt, with no signs that any effort to reduce the principle is in sight. It's a Ponzi scheme that...
  13. hevans1944

    Picture to Circuit Board coding

    Back in the day, Vector Electronics was always my "go to" source for prototyping materials. Reliable products, well manufactured, mostly affordable if it could be charged to a customer's contract. Then (I don't remember when) other manufacturers entered the game with mostly good products that...
  14. hevans1944

    Picture to Circuit Board coding

    Wonder no more! I used to purchase prototyping boards from an electronics distributor that offered name-brand, made in the U. S. of A., fully documented boards... I could go to the manufacturer's website and download a spec sheet showing exactly how the board I ordered would look on both sides...
  15. hevans1944

    COVID-19

    Amen to that. America and Americans are a resilient lot, slow to move sometimes but like a juggernaut when finally in motion. I suspect our Congress will eventually have to intervene with laws defining who gets what, where, and when. If the isolation continues much longer, with people out of...
  16. hevans1944

    Picture to Circuit Board coding

    If you have any more of these prototyping boards, I have an elegant solution to your dilemma: take a small piece of fine sandpaper and remove the lettering from one side of the board. Your choice as to which side, but I suggest that you "fix" all the boards at the same time, and remove the...
  17. hevans1944

    Picture to Circuit Board coding

    On my laptop running Windows 10 Professional, holding down the "CTRL SHIFT +" keys (three keys) simultaneously causes the image to enlarge each time the "+" key is released and pressed again... up to a maximum of eight presses. Doing this still does not reveal much about the markings on the...
  18. hevans1944

    Creating a user interface for arduino.

    Yeah, back in the day, I always used a hardware debounce circuit based on SPDT switch contacts, connected to cross-coupled inverters. Unfortunately, tactile switches are more common nowadays and these are mainly only available as SPST, although I suppose other arrangements are possible. Anyhoo...
  19. hevans1944

    Pneumatic solenoid valve help

    Lessons learned (hopefully): (1) Don't use solderless breadboards for power wiring; and (2) solder wires that carry heavy currents. It's nice that you got the pneumatic solenoid valve working without a datasheet. When you discovered that it worked okay when connected directly to the battery but...
  20. hevans1944

    Bearing found inside subwoofer! Does it go to it?

    Sounds like a complete ball-bearing (outer race, inner ball carrier with balls, inner race) from your description of size (about that of a quarter) plus thickness. Might have come from a disassembled toy, however unlikely that might be. How old are the "little kids" and how handy are they with...
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