no audio / scope data OK

[optimaxch]

hi,

[env:pico32]
platform = espressif32
board = pico32
framework = arduino
upload_port = COM5
monitor_speed = 115200

.bck_io_num   = GPIO_NUM_26,             // bit clock
.ws_io_num    = GPIO_NUM_32,             // word select L/R
.data_out_num = GPIO_NUM_25,           // data

upload OK, no error messages.

adafruit MX98357

danke aus österreich
rudi

[cgreening]

Hi Rudi,

Did you upload the filesystem image - that contains the WAV file - I'm not sure if there's much error checking on opening the file.

Thanks
Chris

[optimaxch]

hi chris,
yes i tried with two boards, tried sine wave and sampleWAV and uploaded image with tool
(this is adafruit breakout )
i will try sparkfun next....

thanks from austria
rudi

[cgreening]

Sorry Rudi - that was a silly question on my part - of course you've uploaded the file system - otherwise you wouldn't see any waveforms on the scope.

You have me stumped - can you post a photo of the connections going into the MAX? It might be worth trying the tie the gain pin and the SD pin to high or low - just make sure there's nothing weird happening from having them floating.

And you've definitely go power going the MAX breakout board?

[optimaxch]

hi chris,
took me long to adapt your work to ESP32-pico, using platformio.
actually i needed to open a new project, and copied your files and libs to project directory.
using your example i2s_output.
i am running a sparkfun MAX98357 on 5V , gain pin grounded, with crisp sound - very clear!
when adding scope to speaker output - sound is gone...

i am looking for changing gain per software command ?
where to change the gain setting in lib ?

very satisfied , THANKS
good day & health
greetings to london from villach
rudi

[optimaxch]

hi chris,
took me too long to figure out the correct audio settings, when adding own .wav file:

recording
audacity
audio host : Windows WASAPI
track : mono
preferences quality: 8000Hz / 16 Bit

file export wav
save as : wav (Microsoft)
encoding : Signed 16-bit PCM

maybe this helps, other audiophiles...
( its interesting you original sample file is 8000Hz / 32bit float )

can you help to play different .wav files one after next ?
i tried in the loop - without successssssss

thanks
rudi

[optimaxch]

hi chris

i am unable to play separate .wav files one after next..
please can you help.
i like to create an short announcement voice, speaking a text according an event.
for example "power 1 " power 2"...

• and i am unable to place your code inside loop .
  audio.txt

thanks from austria
rudi

[cgreening]

Hey Rudi,

It might be worth having a look at the code I wrote for recording and playing from SD Card which I've updated to work with SPIFFS.

https://github.com/atomic14/esp32_sdcard_audio/tree/main/arduino-wav-sdcard

Jusy uncomment the line in config.h to switch on SPIFFs instead of SD Card.

It's quite a bit simpler and would work well in loops.

I need to come back and simplify the example code here.