Search results

Search Forums New Posts
  1. N

    A ground / negative connection question

    Yes. The power supply is connected to +5 and GND (0volts, power supply negative). There are two +5 connections, which should go together and to the supply positive. There are four places to connect together to GND, which goes to the supply ground (-ve). The last one is the power supply bypass...
  2. N

    measuring time and distance

    As Bluejets says, it seems that you'll need something extra to get accurate distance measurement. I asked above whether the wheels spin? You suggested monitoring the front wheels. If they slip relative to the ground, you internal counter won't be tracking the true ground, so your onboard idea of...
  3. N

    measuring time and distance

    I guess there are two main ways to make the led bar display. Simple LEDs on output pins and smart LEDs. Simple hardware using one LED per output pin will use more pins, but is conceptually simpler. The arduino IDE comes with examples. One of them is "Blink" which shows how to blink an LED. This...
  4. N

    measuring time and distance

    Often, nowadays, as you have drawn, the easiest answer is a microcontroller, but this requires software rather than hardware. This is not so difficult, but a different skillset. A purely hardware solution might be quite complicated, but microcontrollers tend to be very flexible and with many...
  5. N

    measuring time and distance

    It seems you have a lot of it sorted out. Which parts are giving you trouble?
  6. N

    measuring time and distance

    So lots of lines to get a real-time readout as he goes? Long barcode? . Hence my question about whether finish time is all he wants, or progress bar comparison as he races towards the end.
  7. N

    measuring time and distance

    Am I reading this right? You want real-time progress this run compared to the same distance from the prvious or reference run? Like a bar display showing running behind, or ahead of previous? So what's the quantity of interest? Distance versus time? I guess your wheels spin? So distance might...
  8. N

    How can I make Audio Amplifier from 2SK3549-01 MOSFET

    OK, so if you have enough clock cycles to use a higher carrier, and still get the resolution you want, then higher is better. If you arrange a low pass filter on the output, then this may cut the amount of carrier that the speaker sees. As I mentioned, I don;t know much about speakers: they are...
  9. N

    How can I make Audio Amplifier from 2SK3549-01 MOSFET

    Thanks for the waveforms. I see the lower one is marked "delta PWM" I'm not sure that I follow this. The PWM signal appears to follow the slope rather than the voltage. This is as also suggested by the "delta". It is as if there is an integration somewhere. I guess for a sineusoid, this would...
  10. N

    How can I make Audio Amplifier from 2SK3549-01 MOSFET

    I guess the speaker cone's repsonse depends on drive, PWM frequency and momentum? Can't say I've done those sums. If the speaker looks inductive, does the cone react more to voltage or current? Perhaps a comment about how to go from PWM to something speaker-friendly? If he has limited voltage...
  11. N

    How can I make Audio Amplifier from 2SK3549-01 MOSFET

    Thanks for the image. >>Honesty I don't know what common emitter configuration means , Not to worry. Google it if you want. You'll get here. https://en.wikipedia.org/wiki/Common_collector = emitter follower https://en.wikipedia.org/wiki/Common_emitter Recognising these two will speed you...
  12. N

    How can I make Audio Amplifier from 2SK3549-01 MOSFET

    Great, so you went for a common emitter configuration as suggested. :) Found you could skip the FET you asked to use. ok. . That ground-like symbol at the bottom, on the emitter of Q1, is to the supply positive, right? And the other one at the bottom of V1 is ground, zero volts, right? Alec_t...
  13. N

    How can I make Audio Amplifier from 2SK3549-01 MOSFET

    Have a look at the configuration https://forum.arduino.cc/index.php?topic=451897.0 I've not looked at the value and not for your components, but the configuration might be of interest. Might want to add a resistor in the base of the transistor, to limit base current, depending on your...
  14. N

    Is this voltage and amp schematic correct?

    Is this it? I assume that the battery symbols are in fact connectors, U1, U4. Your device under test is a battery? You plug a battery into either U1 or U4. You plan to short the battery to the ACS758 to measure your "amperage"? In your diagram it seems both U1 and U4 are in series with the...
  15. N

    Is this voltage and amp schematic correct?

    Not much to debate here, sorry. Just googled it, as that's the modern standard for "correct: I guess. Your's is the first time, I've seen anyone use the battery symbol shorter line for "+" and longer one for "-". Even my daughter's physics text says it's the other way round. :) Generally...
  16. N

    Fluctuating ADC Reading for 4-20mA Pressure transducer input?

    Have you tried the ADC with a known constant input, such as a voltage derived from the power supply or other regulated source? Might confirm your ADC and use of it are good.
  17. N

    gyroscope (un)desired traits for the extended kalman filter

    I'm not sure what you mean to ask, sorry. Been some time since I have programmed any such thing. By truncation, do you mean truncation of the distribution?
  18. N

    Need help building RF Detector

    Another option is rather than look for the RF, to detect the equipment, whether it is on or off. https://en.wikipedia.org/wiki/Nonlinear_junction_detector https://hackaday.com/2017/09/20/spy-tech-nonlinear-junction-detectors/ . Have not tried this, so cannot confirm nor deny.
  19. N

    I am building an electric fence driver and need to know if has too much or too little power

    In some places electric fences in urban areas are banned. I guess you;re not in an urban area. Fences for cows might be quite different, or set differentlt, from those for smaller animals. . Discharging from a capacitor is a good concept as you can calculate the maximum energy delivered. . A...
  20. N

    Need help with Arduino Code for coil winder

    Probably need to move this to a new thread, as you have posted to a very old thread. You ask for a solution to the whole problem. Perhaps you could outline what software components you have now and which parts are giving you trouble?
Top