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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...

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...

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...

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...

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...

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?
...

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...

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...

Thanks Frank! we are not alone :)

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...

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:

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 ...

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...

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...

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...

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.

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.
//

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....

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...

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...