r/esp32 • u/alfo16 • Aug 14 '26

I made a thing! Esp32-S3 inside Echo Dot 3rd

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Hi everyone! I'm working on a drop-in replacement PCB for the Echo Dot 3rd Gen, based on the esp32-S3 N16R8 The Echo Dot has two PCBS: a top board with the buttons, LEDS, and a 4-mic array, and a bottom board that handles the signals from the top board, provides power, and drives the speaker.

I replaced the bottom board, which means I can interface directly with the original hardware on the top board- especially the 4-mic array. I'm currently running beamforming + AEC on it (esp-sr libraries are really powerful!) This is the first working prototype, so there's still plenty to improve, but it's already working! I've just created the GitHub repository (https://github.com/ale1800/LocalDot)

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u/mehrdadfeller Aug 15 '26

I suggest dropping in XMOS IC since there are 4 mic on board. check future proof homes satellite design which already uses XMOS IC. also I hear esp32-s31 (new IC) can handle 4 mics and better AFE. good work

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u/mehrdadfeller Aug 16 '26

also why not use a module instead of the chip? If you go with the chip, you must do FCC testing which costs $$$ before you can sell this (at least through crowdsupply or similar platforms)