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Notes

Hardware notes for small products

New
Hardware

What Is a MEMS Microphone? From a Silicon Diaphragm to ESP32 Audio

Macro photo of a MEMS microphone package showing its acoustic port and package marking

Learn how MEMS microphones work, how analog, PDM, and I2S outputs differ, and how to avoid PCB, power, and acoustic-port mistakes.

HardwareFirmwareESP32-S3+4
Hardware

ESP32 Battery Power Design: From USB-C Charging to the 3.3V Rail

Top-view PCB render of the ESP32-S3 battery power reference design used in the article

Review an ESP32-S3 battery power path from USB-C and TP4056 charging to protection, load sharing, 3.3V regulation, and load budget.

HardwarePCB DesignESP32-S3+3
Hardware

ESP32-C3 or ESP32-S3: Which Chip for a Robot with a Screen and Audio?

ESP32-C3 board with a small OLED next to an ESP32-S3 board with a color display and speaker

Comparing ESP32-C3 and ESP32-S3 on GPIO, RAM, PSRAM, USB, I2S, and LVGL headroom, with a concrete recommendation for a basic Mochi build and a Mochi AI build.

HardwareProduct DesignESP32-C3+2
Hardware

First Notes On Hardware Design For Small Products

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

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

HardwarePCB DesignFirmware

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