Difference: I2SAndSound (1 vs. 5)

Revision 52022-09-24 - UliRaich

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META TOPICPARENT name="Exercises"

I2S and sound

Introduction

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FMT Gnd  
XSMT short-circuit with A3V3   3.3 V output from regulator LDO
The SD card module, which may be used to store the music files, uses D5,D6,D7,D8 for its interface pins. These pins should therefore be avoided when choosing the pins for the PCM5102 module. D3 and D4 are used for PSRAM in case of the WROVER-B module.
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I2S microphones

Two different I2S microphone breakout boards are available:

Both microphones are supported by the MicroPython I2S driver.
INMP441 front view INMP441 back view
inmp441_front.png inmp441_back.png
SPH0645 front view SPH0645 back view
sph0645_front.png sph0645_back.png
 

I2S examples

Mike Teachman, the author of the I2S MicroPython driver has supplied a series of test programs for his driver. These examples need some slight modifications due to different connections of the I2S pins with respect to his hardware:

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META FILEATTACHMENT attachment="max98357a.png" attr="" comment="" date="1611505403" name="max98357a.png" path="max98357a.png" size="208396" user="UliRaich" version="1"
META FILEATTACHMENT attachment="pcm5102.png" attr="" comment="" date="1611505405" name="pcm5102.png" path="pcm5102.png" size="130048" user="UliRaich" version="1"
META FILEATTACHMENT attachment="pcm5102back.png" attr="" comment="" date="1611510513" name="pcm5102back.png" path="pcm5102back.png" size="90367" user="UliRaich" version="1"
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META FILEATTACHMENT attachment="inmp441_front.png" attr="" comment="" date="1664009577" name="inmp441_front.png" path="inmp441_front.png" size="146466" user="UliRaich" version="1"
META FILEATTACHMENT attachment="inmp441_back.png" attr="" comment="" date="1664009578" name="inmp441_back.png" path="inmp441_back.png" size="160263" user="UliRaich" version="1"
META FILEATTACHMENT attachment="sph0645_front.png" attr="" comment="" date="1664009578" name="sph0645_front.png" path="sph0645_front.png" size="112645" user="UliRaich" version="1"
META FILEATTACHMENT attachment="sph0645_back.png" attr="" comment="" date="1664009579" name="sph0645_back.png" path="sph0645_back.png" size="123912" user="UliRaich" version="1"

Revision 42021-07-07 - UliRaich

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META TOPICPARENT name="Exercises"

I2S and sound

Introduction

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LRCLK D1: GPIO 22 left/right clock
FMT Gnd  
XSMT short-circuit with A3V3   3.3 V output from regulator LDO
Added:
>
>		The SD card module, which may be used to store the music files, uses D5,D6,D7,D8 for its interface pins. These pins should therefore be avoided when choosing the pins for the PCM5102 module. D3 and D4 are used for PSRAM in case of the WROVER-B module.

I2S examples

Mike Teachman, the author of the I2S MicroPython driver has supplied a series of test programs for his driver. These examples need some slight modifications due to different connections of the I2S pins with respect to his hardware:

  • SCK_PIN: corresponds to the hardware pin BCK and must be set to GPIO 26
  • WS_PIN: corresponds to hardware pin LRCK and must be set to GPIO 22
  • SD_PIN: corresponds to hardware pin Din and must be set to GPIO 21
With these modifications, play-tone.py should work. In order to make play-wav-from-flash-blocking.py work modified the WAV_FILE to wav/side-to-side-8k-16bits-stereo.wav. Then I created the folder /wav on the ESP32 with ampy and copied side-to-side-8k-16bits-stereo.wav to the folder.
 -- Uli Raich - 2021-01-24

Comments

Revision 32021-07-07 - UliRaich

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META TOPICPARENT name="Exercises"

I2S and sound

Introduction

Line: 26 to 26
 
SD n.c.  
Gain Gnd important: don't leave this pin floating!
Din D2: GPIO 21 audio data
Changed:
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BCLK D3: GPIO 17 bit clock
>
>
BCLK D0: GPIO 26 bit clock
 
LRC (LRCLK) D1: GPIO 22 left/right clock

Connecting the PCM5102:

pcm5102.png pcm5102back.png

PCM5102 pin pin on ESP32 CPU card signification
Changed:
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Vcc 3.3V  
>
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Vcc 5V  
 
Gnd Gnd  
Changed:
<
<
BCK D3: GPIO 17 bit clock
>
>
BCK D0: GPIO 26 bit clock
 
Din D2: GPIO 21 audio data
Changed:
<
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Lck (LRCLK) D1: GPIO 22 left/right clock
>
>
LRCLK D1: GPIO 22 left/right clock
 
FMT Gnd  
Changed:
<
<
Xmt Vcc  
>
>
XSMT short-circuit with A3V3   3.3 V output from regulator LDO
 -- Uli Raich - 2021-01-24

Comments

Revision 22021-01-24 - UliRaich

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META TOPICPARENT name="Exercises"

I2S and sound

Introduction

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  • the PCM5102a, a stereo converter board with a connector for head phones. If we want to connect a loudspeaker to this board we have to pass through an audio amplifier.

Connecting the MAX98357A

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>		max98357a.png
 Here is a table showing how I connected the MAX98357A to the ESP32 board:

MAX98357A pin pin on ESP32 CPU card signification
Changed:
<
<
GND GND  
>
>
Gnd Gnd  
 
Vcc 3.3V  
SD n.c.  
Changed:
<
<
Gain GND  
>
>
Gain Gnd important: don't leave this pin floating!
 
Din D2: GPIO 21 audio data
BCLK D3: GPIO 17 bit clock
Changed:
<
<
RC (LRCLK) D1: GPIO left/right clock
>
>
LRC (LRCLK) D1: GPIO 22 left/right clock

Connecting the PCM5102:

pcm5102.png pcm5102back.png
 
Added:
>
>
PCM5102 pin pin on ESP32 CPU card signification
Vcc 3.3V  
Gnd Gnd  
BCK D3: GPIO 17 bit clock
Din D2: GPIO 21 audio data
Lck (LRCLK) D1: GPIO 22 left/right clock
FMT Gnd  
Xmt Vcc  
 -- Uli Raich - 2021-01-24

Comments

Line: 35 to 47
 
META FILEATTACHMENT attachment="max98357a.png" attr="" comment="" date="1611505403" name="max98357a.png" path="max98357a.png" size="208396" user="UliRaich" version="1"
META FILEATTACHMENT attachment="pcm5102.png" attr="" comment="" date="1611505405" name="pcm5102.png" path="pcm5102.png" size="130048" user="UliRaich" version="1"
Added:
>
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META FILEATTACHMENT attachment="pcm5102back.png" attr="" comment="" date="1611510513" name="pcm5102back.png" path="pcm5102back.png" size="90367" user="UliRaich" version="1"

Revision 12021-01-24 - UliRaich

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Added:
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META TOPICPARENT name="Exercises"

I2S and sound

Introduction

In order to play audio files we need:

  • the audio file itself, which we expect to be in uncompressed wav format
  • a file system from which to read the file. This is available in MicroPython either in its internal flash or on an SD card
  • a fast 16 bit DAC to convert the audio data into an analogue form that can be consumed by a loadspeaker
  • an amplifier to get enough signal power needed for the loadspeaker
  • a software driver implementing the I2S protocol
The digital data must be transferred to the DAC, which is done through the I2S protocol invented by Philips in the end 1980 ies.

There are two cheap I2S boards converting digital audio data to an analogue audio signal and communicating through the I2S protocol:

  • the ! MAX98357A, a mono converter board with integrated amplifier to which we can directly connect a loadspeaker
  • the PCM5102a, a stereo converter board with a connector for head phones. If we want to connect a loudspeaker to this board we have to pass through an audio amplifier.

Connecting the MAX98357A

Here is a table showing how I connected the MAX98357A to the ESP32 board:

MAX98357A pin pin on ESP32 CPU card signification
GND GND  
Vcc 3.3V  
SD n.c.  
Gain GND  
Din D2: GPIO 21 audio data
BCLK D3: GPIO 17 bit clock
RC (LRCLK) D1: GPIO left/right clock

-- Uli Raich - 2021-01-24

Comments 

<--/commentPlugin-->

META FILEATTACHMENT attachment="max98357a.png" attr="" comment="" date="1611505403" name="max98357a.png" path="max98357a.png" size="208396" user="UliRaich" version="1"
META FILEATTACHMENT attachment="pcm5102.png" attr="" comment="" date="1611505405" name="pcm5102.png" path="pcm5102.png" size="130048" user="UliRaich" version="1"
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