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  1. Hi Thanks I checked it with two fixed...

    Hi

    Thanks

    I checked it with two fixed resistors and it works quite well.
  2. 3.3V - 1000ohm or a bit more fixed resistor - the...

    3.3V - 1000ohm or a bit more fixed resistor - the analog in - and a PT1000 (a bit above 1000Ohm) to the ground

    So about 2000-2300 ohm from 3.3V to ground.
  3. It's indeed to only turn on the current when...

    It's indeed to only turn on the current when measuring.

    Because I plan it to be battery powered and only need a measurement every few seconds (or even less), I want to conserve unneeded energy.
  4. possible to power a voltage divider for a analog in by a digital out?

    Hi

    Probably a stupid question:

    Is it possible to use a digital out to give the +3.3V to a voltage divider which is read bij an analog pin?
    (aprox. 1000 Ohm - 1000 Ohm divider).

    Is it stable...
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    thanks for the answer

    thanks for the answer
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    Hi Which preamp do you use for the headphone?...

    Hi

    Which preamp do you use for the headphone?


    Alain
  7. Is it suffient to solder the used pins?

    Is it suffient to solder the used pins?
  8. I should have been clearer. Is it possible to...

    I should have been clearer.

    Is it possible to configure the M8Q via the I2C and is this a rather straight forward proces?
  9. GNSS/GPS Any experience with the sparkfun Ublox SAM-M8Q breakout board?

    Hi

    Has anybody experience with the SparkFun GPS Breakout - Chip Antenna, SAM-M8Q (Qwiic)?

    Specialy "programming" the Ublox.

    Alain
  10. Thread: Bat detector

    by AlainD
    Replies
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    Edwin Have you tried to use the tl972 with a...

    Edwin

    Have you tried to use the tl972 with a higher gain and using the SGTL at a lower gain?


    Alain
  11. audio library + lora devices (for non audio messages)?

    Hi

    Has anybody combined audio processing with lora devices (non audio messages)?

    I've seen SPI versions and also a few uart based lora devices.


    Alain
  12. Hi This will take quite some practice ;-( I...

    Hi

    This will take quite some practice ;-( I also rather start first development with a known working audio adaptor board.

    I just find it strange that this is not offered. nobody?

    Alain
  13. Audio Adaptor Board with headers soldered on in the EU?

    Hi

    Is there a place in the EU that sells a Audio Adaptor Board with headers already soldered on?


    Alain
  14. Any precautions when using a class D mono amp...

    Any precautions when using a class D mono amp (1-3watt) to drive 1 side off a headphone?

    Alain
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    Hi The invensense ICS-40730...

    Hi

    The invensense ICS-40730 has about 9db more SNR than you're PCB mic, but listens from the bottom.
  16. Thread: Bat detector

    by AlainD
    Replies
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    Hi I did read that there was a PGA...

    Hi

    I did read that there was a PGA (programmable Gain Amplifier) inside the teensy, but it's only in the 3.2.

    if I did the calculations right 12 bit divided by 2 (wave form) gives a SNR of ...
  17. Thread: Bat detector

    by AlainD
    Replies
    548
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    47,024

    Hi Thanks I also did read somewhere that...

    Hi

    Thanks

    I also did read somewhere that there's an amp in differential mode, but I'm very unsure and it beyond my knowledge.

    Alain
  18. Thread: Bat detector

    by AlainD
    Replies
    548
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    47,024

    Thanks for the good work.

    Thanks for the good work.
  19. Thread: Bat detector

    by AlainD
    Replies
    548
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    47,024

    Could Frank decribe the improvements? Jean-Do:...

    Could Frank decribe the improvements?

    Jean-Do: are you using it in "differential output" mode?


    Alain
  20. Thread: Bat detector

    by AlainD
    Replies
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    47,024

    Hi I found the "FabMicroMEMS-PCB.odt " very...

    Hi

    I found the "FabMicroMEMS-PCB.odt " very instructive as you're other documents.
  21. Thread: Bat detector

    by AlainD
    Replies
    548
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    47,024

    Hi I've read the ICS40730 mems mic properties...

    Hi

    I've read the ICS40730 mems mic properties and to me it seems a very nice device, but I'm not looking at ultrasound ;-)
    Am I reading the specs correctly that it even can be used without an...
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    Except for the speed problem, why not using 1...

    Except for the speed problem, why not using 1 T3.6 and doing the delay line in the Teensy's RAM. That seems a lot easier to me and probably just as fast.
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    driving a 3W LED (700mA approx 3.5V fc)

    I want to drive a 3W LED. I can use a TIP120 or MOSFET to switch it from the teensy.

    But what's the best practise to drive it, I suppose constant current source?

    I did find a LDD-600LW, which...
  24. From what I read a uln2803A seems as easy as it...

    From what I read a uln2803A seems as easy as it gets?

    On the other hand, most modules that I found need 5V.
  25. ULN2803A Darlington Array and maybe a TIP120 to switch/control PC case fans

    Hi

    I'm thinking to control 4 or more PWM PC Case fans from a teensy LC (or 3.2).

    I would do 2 things :

    a) use 5V to send a pwm signal to every fan seperate
    b) switch 12V on and off (group...
  26. Has nobody some info about this? BTW. I don't...

    Has nobody some info about this?

    BTW. I don't mind the needed c++ changes.
  27. Hi I found that the SGTL5000 can turn parts...

    Hi

    I found that the SGTL5000 can turn parts off. Is it save to turn the not used parts off while using the audio library?
    Any power use nr's if everything is "powered off" ?

    See...
  28. Why a switch and not using the snooze library to...

    Why a switch and not using the snooze library to get low power states?
  29. Has nobody needed/tried this? I found mA nr's...

    Has nobody needed/tried this?

    I found mA nr's while in use, but I'm interested if it's possible to sleep, hibernate or even turn off the Audio board.
    ...
  30. Would this amp (or the prop shield) be usable for...

    Would this amp (or the prop shield) be usable for a headphone?

    If yes would it be advisable to add a resistor in parallel to th headphone to get rid of some power?
  31. Audio Adaptor Board low power or shutdown, how?

    Hi

    I'm considering an audio application powered by 3xAAA. It's used only for a duration of about 10-20 minutes and then back a few days later.

    From past experience with similar simple...
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    Hi If I look at the soft pod on adafruit...

    Hi

    If I look at the soft pod on adafruit (https://www.adafruit.com/product/178) I see that those need a 10K resistor between Vcc and the ribbon and another one between the ribbon and ground.
  33. Hi I remember that the wires for IS should be...

    Hi

    I remember that the wires for IS should be short. Any guidelines for a mic?

    Alain
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    Hi If I read the data sheet for the MAX9817...

    Hi

    If I read the data sheet for the MAX9817 correctly, I see Attack/release values for the AGC of 1/4000 ms/ms. Does that mean that a loud sound is compensated within 1ms (lowering of the gain),...
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    Hi Kurt Are you still using this setup with...

    Hi Kurt

    Are you still using this setup with the lm386 or did you made some changes afterwards?
    Still happy with it?
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    The LM386 can be powered by 5V. This means that...

    The LM386 can be powered by 5V. This means that teensy and amplifier can use the same supply and battery 5V solutions are easily available. Those can charged by usb (and testing can be done while...
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    About the LM386: are there more considerations...

    About the LM386: are there more considerations than written in the last of kurtE's posts Connecting-a-Speaker-to-Teensy-3-1-DAC-A14?
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    Hi Have you tested it with the teensy? I...

    Hi

    Have you tested it with the teensy?

    I also found the lm4881 based amp, but it needs 12V and the board is rather large.


    BTW. I have nothing against the audio shield, but I don't like the...
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    Hi Paul Another question: I read that the...

    Hi Paul

    Another question:

    I read that the audio shield has to have very short connections to the teensy. Are there problems to be expected when the teensy and the audio shield are both...
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    Hi Would a headphone amplifier like the hama...

    Hi

    Would a headphone amplifier like the hama HA202 or the FiiO A1 solve this also?
  41. yes, thanks

    yes, thanks
  42. Without a 10uF capacitor in series to avoid the...

    Without a 10uF capacitor in series to avoid the DC through the headphone?
  43. a question How is you're headphone connected...

    a question

    How is you're headphone connected to the teensy? Is there a seperate amp or is it a direct connection and working?
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    Could be also a nice example for a I/O shield, if...

    Could be also a nice example for a I/O shield, if it's usable from a teensy LC.

    --> no soldering off small cables. and no things on the bottom.
    ...
  45. Well it depends. slave devices or custom PCB's...

    Well it depends. slave devices or custom PCB's are currently a big extra step for people that want to start.

    A 3.2++ (or even LC++, but I think it's already has all IO to the side pins) with...
  46. No off course not. For me such a large Teensy...

    No off course not. For me such a large Teensy isn't for everybody, but I see quite a few things on the forum that are "needing" large numbers of I/O.
    Although using slave LC's is maybe a better...
  47. mmm a huge I/O Teensy with 30 pins on each side...

    mmm a huge I/O Teensy with 30 pins on each side would give 3 pcb's instead of 4. It would be breadboard testable, fit on a Perma-Proto Half-sized Breadboard PCB and be usable with single layer...
  48. Hi I don't see a breadboard useful to make a...

    Hi

    I don't see a breadboard useful to make a complete setup, but very useful to setup a subset for testing.
    For example : If I use rotary encoders with a push button I don't need to connect all...
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    Hi As you're talking about a shield that has...

    Hi

    As you're talking about a shield that has the consequence that only the side pins are usable. If interrupts are useful for the application this limits things ;-) My guess is that knob rotary...
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    I'm looking for buttons where I even want to do...

    I'm looking for buttons where I even want to do action depending on short-long push and conditional even actions on release. So I really don't mind 10-20msec delay's

    I would say that the counting...
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