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  1. Thread: Bat detector

    by dwd
    Replies
    876
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    110,149

    I guess it depends how reliable it needs to be....

    I guess it depends how reliable it needs to be. If we must never exceed a fixed limit (e.g. if there is a fixed in-memory buffer limit) it would be better to dynamically partition the files. By that...
  2. Thread: Bat detector

    by dwd
    Replies
    876
    Views
    110,149

    Hi Cor, Does the existing SD Library (or the...

    Hi Cor,

    Does the existing SD Library (or the new one) support the use of folders? If so, you could just store the list of folders and the contents of the current folder in RAM. For example if you...
  3. Thread: Bat detector

    by dwd
    Replies
    876
    Views
    110,149

    That is an interesting paper. It gives rise to...

    That is an interesting paper. It gives rise to another enhancement request, as well as the stereo microphones, could stereo cameras be added with a 20-30Hz strobe trigger for a bank of flash guns?...
  4. Thread: Bat detector

    by dwd
    Replies
    876
    Views
    110,149

    Many thanks Edwin, those answers make a lot of...

    Many thanks Edwin, those answers make a lot of sense and I hopefully understand better how everything works. The comment about the sound pressure generated by a bat was just to highlight how...
  5. Thread: Bat detector

    by dwd
    Replies
    876
    Views
    110,149

    No matter what I try, I cannot generate any...

    No matter what I try, I cannot generate any signal through the microphone. (I can inject noise by touching various parts of the mic board.) That makes me think my initial guess that I broke the...
  6. Thread: Bat detector

    by dwd
    Replies
    876
    Views
    110,149

    Sorry for the confusion, when I said "I hear...

    Sorry for the confusion, when I said "I hear nothing" I meant apart from noise. No signal from and sound or ultrasound I can generate.

    I'll try harder tomorrow, but tested quickly just now. With...
  7. Thread: Bat detector

    by dwd
    Replies
    876
    Views
    110,149

    Looks like that did the trick, as I now have some...

    Looks like that did the trick, as I now have some signal displayed, if I turn the gain up over 50. However, I hear nothing. (Tried rubbing fingers and jangling keys. I even tried gently rubbing the...
  8. Thread: Bat detector

    by dwd
    Replies
    876
    Views
    110,149

    I put an oscilloscope across the AF in on the...

    I put an oscilloscope across the AF in on the audio board and touched the middle pin on the mic board and could see some nice noise ~1v peek to peek (not 0.2v as originally states, as someone had...
  9. Thread: Bat detector

    by dwd
    Replies
    876
    Views
    110,149

    Thanks for the suggestions, Edwin. The results...

    Thanks for the suggestions, Edwin. The results are:

    Playing WAV file shows as expected in display (waterfall) and audible in headphones
    3.3v good (well, 3.2v but hopefully close enough) both...
  10. Thread: Bat detector

    by dwd
    Replies
    876
    Views
    110,149

    That sounds like a good place for me to start! Do...

    That sounds like a good place for me to start! Do you know where I can find a suitable file? (If you have one you don't mind sharing, you could upload it to your GIT repo, with test instructions.)
    ...
  11. Thread: Bat detector

    by dwd
    Replies
    876
    Views
    110,149

    Thanks CorBee. You asked for software improvement...

    Thanks CorBee. You asked for software improvement suggestions before, perhaps a [self] test option, if you hold down the right push-button during power-on (like the reset option). Not 100% sure what...
  12. Thread: Bat detector

    by dwd
    Replies
    876
    Views
    110,149

    Some good news, after some shipping delays and...

    Some good news, after some shipping delays and illness, all the parts have arrived and have been put together and it turns on, can be programmed and even has a nice display. Not so good news is the...
  13. Thread: Bat detector

    by dwd
    Replies
    876
    Views
    110,149

    For now I just plan to build the detector, but I...

    For now I just plan to build the detector, but I will probably add some extra headers, so I can experiment when I have more time (probably next winter). A plug in Bluetooth audio transmitter may be a...
  14. Thread: Bat detector

    by dwd
    Replies
    876
    Views
    110,149

    That sounds interesting. I have been thinking...

    That sounds interesting. I have been thinking about this while waiting for all my parts to arrive. Are you using a module like HC-05/06? I was wondering about using an ESP32 as a co-processor (it...
  15. Thread: Bat detector

    by dwd
    Replies
    876
    Views
    110,149

    Thanks Edwin. That worked better. Your parts list...

    Thanks Edwin. That worked better. Your parts list has LP2950Z which produced no hits. I'll see is I can order the rest of the parts tomorrow and see if I can beat the bats.
  16. Thread: Bat detector

    by dwd
    Replies
    876
    Views
    110,149

    Sorry I am so late to this party, but I only...

    Sorry I am so late to this party, but I only accidentally discovered this project last week. Actually, I was possibly too early as I had an idea to build a similar bat detector with FFT & frequency...
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