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Firmware

Everything tagged “Firmware” across notes, resources, and Mochi logs.

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

Running Linux on ESP32-S31: What the MMU Changes

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 LinuxLinuxBuildrootRISC-VMMUESP-IDF
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ESP32 sensor prototype and smartphone being tested over Bluetooth Low Energy on an electronics workbench
New
IoT SolutionsIoT Solutions

Deep Dive: BLE Communication for IoT Devices

A practical guide to reliable BLE communication for IoT devices, covering GATT, packets, MTU, notifications, reconnection, security, and power with ESP32 NimBLE.

IoT SolutionsBluetooth Low EnergyBLEESP32NimBLEGATTFirmware
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Engineer reviewing the network and firmware security of an ESP32 development board on a workbench
IoT SolutionsIoT Solutions

IoT Security Trend: A Practical Baseline for Connected Devices

A practical IoT security guide for ESP32 and connected devices, from threat modeling and unique identity to Secure Boot, signed OTA, protected storage, and testing.

IoT SolutionsIoT SecurityCybersecurityESP32Secure BootOTAFirmware
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Camera-equipped ESP32-S3 prototype running person detection locally on a workbench
NotesFirmware

TinyML on ESP32: Running AI on the Device

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-S3TinyMLMachine LearningEdge AI
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Original OLED prototype displaying a simple face during firmware experiments
MochiFirmware

Designing an Emotion State System for the Mochi Robot

Build a Mochi Robot emotion state machine for idle, listening, talking, happy, sad, thinking, and error states with replaceable animations.

MochiFirmwareEmbedded UILVGLFreeRTOS
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Opened Mochi prototype showing the controller, display, wiring and 3D-printed enclosure used during early hardware experiments
MochiHardware

Complete Hardware Architecture for an ESP32-S3 Mochi Robot

A practical breakdown of ESP32-S3 Mochi Robot hardware: display, touch, I2S microphone, amplifier, speaker, battery, charging, and GPIO.

MochiHardwareESP32-S3Firmware
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Real ESP32 display prototype running an LVGL interface during development
NotesEmbedded UI

Displaying Expressive GIFs on ESP32 with LVGL

A practical guide to animated GIF expressions in ESP32 firmware: convert assets, enable LV_USE_GIF, store files, and render with lv_gif.

Embedded UIFirmwareLVGLESP32
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A small round display showing an expressive face, surrounded by GIF, PNG, JPG, and C array format badges
NotesEmbedded UI

GIF, PNG, JPG, or a C Array: Which Image Format Fits Your ESP32 Screen?

Compare GIF, PNG, JPG, and C array images for ESP32 displays by flash use, RAM use, decode speed, alpha, animation, and quality.

Embedded UIFirmwareLVGLESP32
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Original open robot prototype showing its controller, speaker, battery and display hardware
NotesFirmware

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

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-S3AudioI2S
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Opened Mochi prototype showing the ESP32 board, display wiring and 3D-printed enclosure
NotesFirmware

First Notes On Firmware For Embedded Products

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

FirmwareHardwareEmbedded UI
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Opened Mochi prototype showing the wiring and enclosure compromises from early development
MochiProduct Design

Mochi Devlog 01: Early Development

The first Mochi devlog: early hardware questions, first firmware decisions, and what already went wrong.

MochiHardwareFirmware
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Original Mochi workshop prototype with a 3D-printed enclosure and OLED face
MochiProduct Design

What Is Mochi?

A short introduction to Mochi, a small robot developed as an exercise in hardware, firmware, and product experience.

MochiHardwareFirmware
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Real assembled AQuality32 PCB shown from both sides with its battery and main circuit blocks
NotesHardware

First Notes On Hardware Design For Small Products

Initial principles for designing hardware for a small product: scope, power, PCB layout, firmware, and debugging.

HardwarePCB DesignFirmware
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