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Type: Posts; User: Jeroen

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  1. hi @Kurt To complement my original post: I cut...

    hi @Kurt

    To complement my original post: I cut the pads on the backside of my Teensy and power the device from 1200mah lipo connected to a charger / LiPoly Backpack from Afafruit. As described...
  2. How to power hungry devices from the same battery as Teensy?

    Hi,

    I have an audio project with a small D class amp and some small speakers. The while thing runs fine when I power the Teensy 4 from a single lipo 3.7 volts and I power the amplifier separately...
  3. Hmm well I was not able to measure the current...

    Hmm well I was not able to measure the current draw.

    I'm still using the same setup but I got rid of the noise by switching to the lineout instead of the headphone jack to connect the audioshield...
  4. Wel it was designed to power a Trinket so yeah...

    Wel it was designed to power a Trinket so yeah makes sense.

    Thanks a lot for your replies @Mark I'll see if I can actually measure the power draw. I'm an electronics n00b but I do have a...
  5. Hi Mark, OK I stepped away from the LCD for a...

    Hi Mark,

    OK I stepped away from the LCD for a bit. I ordered the 5V booster/charger you suggested but in the meanwhile I hooked up my audio project to https://www.adafruit.com/product/2124 and a...
  6. Hi Mark, I was thinking about this setup:...

    Hi Mark,

    I was thinking about this setup: https://learn.adafruit.com/assets/28039

    But I take it from your answer that I won't be able to hook up the LCD to 5V when running the rest on 3V?
    ...
  7. Teensy 4.0 on lipo battery with DOG LCD guidance

    Hi,

    I'm looking to create a portable project running on a LiPo battery. 3.7v

    I bought a dog lcd with backlight and the docs mention adding resistors and capacitators when running on 3V.

    If I...
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    Thanks Paul I did that (see above) and now I'm...

    Thanks Paul

    I did that (see above) and now I'm just using standard Teensy example code. I don't see any speeed settings in that so I'm guessing you use the default (25? 30? Mhz) setting in the...
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    Thanks Frank! we are not alone :)

    Thanks Frank! we are not alone :)
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    Nice 1 man show I got going on here :) OK well...

    Nice 1 man show I got going on here :)

    OK well now I moved to teensyduino beta 7, used the exact same code of my original post.

    Finishes instantly, MASSIVE SPEEDUP :)

    p.s. I'm, sure I'll be...
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    Let me first stress that I am a n00b at Arduino...

    Let me first stress that I am a n00b at Arduino programming.

    So now I have trouble getting SDFAT library to work alongside Teensy libs.

    #include <Audio.h>

    This already throws errors:
  12. Replies
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    OK I went browsing through this:...

    OK I went browsing through this: https://github.com/greiman/SdFat/tree/master/examples/TeensySdioDemo

    And distilled an example down to:



    /*
    * Example use of chdir(), ls(), mkdir(), and ...
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    Slow to list 1000+ files

    I'm building an audio project that has like one or two thousand RAW mono audio samples, each a second, max 5 seconds.

    I just want to store all the filenames in an array on startup but with 1300...
  14. OK thanks. I just hooked up another amp and that...

    OK thanks. I just hooked up another amp and that works.

    Can't imagine I already smoked by my new Adafruit amp... seems weird, that's not easy to do I don't think..

    FYI, these lines can be...
  15. I tried this, no change // Simple WAV file...

    I tried this, no change



    // Simple WAV file player example
    //
    // Three types of output may be used, by configuring the code below.
    //
    // 1: Digital I2S - Normally used with the audio...
  16. I tried measuring the voltage on the L+ and GND...

    I tried measuring the voltage on the L+ and GND using my multimeter on V~ 200V (there is no lower setting) but it says 0.
  17. Here's the code: I have changed the wires as...

    Here's the code:

    I have changed the wires as per your suggestions (thanks!)



    // Simple WAV file player example
    //
    // Three types of output may be used, by configuring the code below.
    //
  18. Cannot get Teensy Audio shield line out to produce sound

    Trying to get some sound out of my audio shied using the wavfile playing Arduino example.

    Works fine through the headphones jack. And I have heard it play via the connected amp Adafruit MAX 98306....
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    Thanks Mark. I got into this microcontroller...

    Thanks Mark. I got into this microcontroller stuff as a programmer, I don't have much hardware electronics knowledge. So I had to google most of your message :)
    But yeah great feedback!

    I do...
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    OK this is great info :) I'm hoping my project...

    OK this is great info :)
    I'm hoping my project can do with less power:

    Building a portable audio player. Sound quality doesn't need to be great. I'll just be playing mono voice files indoors. But...
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