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  • Author Author: tariq.ahmad
  • Date Created: Date Created
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Making a WiFi Connected Audio Spectrum Analyzer with ESP32 -- Episode 570

This IoT/Web based Spectrum Analyzer uses a single ESP32 to create up to 64 channels to visualize the different audio bands.It uses only 6 external components to function .It has no LEDS or TFT screens but it uses a HTML webpage to display all the frequency bars. The ESP32 used is running on both processor cores. Core 1 is used to run the main loop of the program while core 0 is used to constantly update the webdata. Although the program itself makes it possible to run on a single core, using both cores will lead to better performance. This is so easy to build and program; you just have to try it! You won’t even have to install the ARDUINO software. Just use the web programmer to upload the precompiled binary file.

 

Supplemental Content:

Layout Schematic
image image

Bill of Material:

Product Name Manufacturer Quantity Buy Kit
Resistor Te Connectivity 4 Buy Now
Capacitor TDK 1 Buy Now
Switch Tactil Te Connectivity 1 Buy Now
 

Additional Parts:

ESP32 DOIT DEVKIT V1.0. You can use other ESP32 but you will have to adjust the wiring accordingly
A breadboard or experimantal PCB to build the circuit on.

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  • Thanks for sharing this cool project...however i cant get around 'kMatrixHeight' was not declared in this scope when I compile...am I to add this or is there something i need to edit? Any help is much appreciated

  • in reply to shenqyd

    Left audio input pin

    Right audio input pin

    Audio ground connection

  • in reply to dougw

    hi doughw would u help, what does L R Gnd in schematic mean

  • in reply to skydiver

      Looks like there may be a typo in the manifest file ?

    image

    image

  • Hi all ,
    Has anyone got this working on an esp32 dev board using Arduino IDE ?
    Tried the web programmer but its failing with 

    Error: Downlading firmware WebSpecElement.bin failed: 404

    Many thanks 
    Jase

  • in reply to DavidB

    Hallo, ich habe das gleich Problem wie David, erst kommt die Fehlermeldung: Failed to initialize. Try resetting your device or holding the BOOT button while selecting your serial port. Dann nach Boost die Meldung: Error: Downlading firmware WebSpecElement.bin failed: 404 was kann ich tun? ESP-WROOM-32 38 Pin - USB-C PORT Silicon Labs CP210x USB to UART Brige (COM4) bitte um Hilfe
    -----------------------------------------------
    Hello, I have the same problem as David, first I get the error message: Failed to initialize. Try resetting your device or holding the BOOT button while selecting your serial port. Then after Boost the message: Error: Downlading firmware WebSpecElement.bin failed: 404 what can I do? ESP-WROOM-32 38 Pin - USB-C PORT Silicon Labs CP210x USB to UART Brige (COM4) please help

  • in reply to r2dev

    Hi R2dev

    Thanks for this important hint....

    In my case the compiler continued with lots more verbose messages then eventually stalled with the verify icon locked in a "yellow" state. (I am using Arduino IDE V2.1.0.) I had to scroll back to find the offending error message and exit the Arduino IDE to continue working.

    The key part of the misleading error message is: 

        C:\Users\....\Arduino\Webspector-main\Webspector\I2SPLUGIN.h:52:9: error: 'adc_gpio_init' was not declared in this scope

    Now that the code compiles and uploads I can add the miscellaneous hardware - I am confident that it is working as probing around SVP pin with my fingers picked up enough noise to analyse. It would be interesting to display the raw time domain signal either simultaneously or as a selectable option. This would make a really cheap teaching tool.

    Does anyone know of a project using Arduino ESP32 scope with a web based display?

    Thanks DavidB

  • Hi Mark, interesting project.

    I am having problems with the webprogrammer. I have used a windows 10 and windows 11  PC and tried both Edge and Chrome. I have successfully loaded the blink sketch into the ESP32 on both PCs. The first message I get is "Failed to initialize. Try resetting your device or holding the BOOT while selecting your serial port." After trying the boot button the new message that I get is "Error: Downlading firmware WebSpecElement.binfailed: 404" Yes that was how downloading was spelt in the error message.

    From the Chrome inspection console I see this message "GET donnersm.github.io/.../WebSpecElement.bin 404" four times. Browsing to the indicated webpage returns a file not found error. 

    Does the webpage still exist? Has the browser evolved to the point where this functionality is no longer supported?

    Thanks David

  • in reply to Jcdl

    Todo o resto funciona mas o analisador não.. Já não sei mais o que fazer... Se puder ajudar agradeço muito.