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Notes

Firmware notes for embedded products

New
Firmware

Running Linux on ESP32-S31: What the MMU Changes

ESP32-S31 development board connected to a laptop displaying a minimal Linux serial console

ESP32-S31 now has an official Linux BSP Developer Preview. Here is a practical look at its MMU, Buildroot, U-Boot, Linux 6.18, build flow, and the limits that still matter.

FirmwareESP32-S31Embedded Linux+5
New
Firmware

TinyML on ESP32: Running AI on the Device

Camera-equipped ESP32-S3 prototype running person detection locally on a workbench

How I run a small person-detection model on ESP32 with TensorFlow Lite Micro and ESP-NN, from memory limits to testing Espressif's example.

FirmwareHardwareESP32-S3+3
Firmware

Extending Battery Life in an ESP32 Robot with a Display

Diagram of active, idle and sleep states used to reduce ESP32 display power consumption

Analyze battery life for an ESP32 robot with a display: backlight, Wi-Fi, audio, peripherals, sleep modes, wake sources, and runtime.

FirmwareHardwareMochi+3
Firmware

Two-Way I2S Audio on ESP32-S3: I2S Microphone and I2S Speaker

Original open robot prototype showing its controller, speaker, battery and display hardware

A practical explanation of BCLK, WS, DIN, DOUT, full-duplex audio, sample rate, and buffers when building two-way I2S audio on ESP32-S3.

FirmwareHardwareESP32-S3+2
Firmware

First Notes On Firmware For Embedded Products

Opened Mochi prototype showing the ESP32 board, display wiring and 3D-printed enclosure

Early principles for firmware on a small embedded product: scope, module boundaries, logging, and handling errors without guessing.

FirmwareHardwareEmbedded UI

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