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PCB Design

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

Annotated PCB view comparing narrow signal traces with a wider power trace
New
NotesPCB Design

Net Classes and Trace Width: When Should a PCB Trace Be Wider?

A practical guide to PCB net classes and trace width for small boards: signal traces, 3V3, 5V, battery paths, ground, power vias, and a pre-Gerber checklist.

PCB DesignHardwareESP32Power DesignKiCad
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Original diagram showing a signal trace and its compact return path over a continuous ground plane
New
NotesPCB Design

PCB Ground Planes: GND Is More Than a Net Name

A practical guide to PCB ground planes, return current, GND layout mistakes, stitching vias, decoupling paths, and copper pour checks.

PCB DesignHardwareESP32Power DesignKiCad
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Close-up of SMD capacitors and resistors on a printed circuit board
NotesPCB Design

Choosing Capacitors for Electronics: Simple Part, Easy Mistake

A beginner guide to choosing capacitors for circuits: capacitance, voltage rating, decoupling, ceramic types, DC bias, and ESP32 values.

PCB DesignHardwareCapacitorsPower DesignESP32
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Close-up of a soldering iron working on a small SMD capacitor on a PCB
NotesPCB Design

How to Hand-Solder SMD Components for Beginners

A beginner-friendly SMD soldering guide covering tools, easy parts, resistors, capacitors, multi-pin ICs, flux, hot air, and PCB inspection.

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

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

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-S3USB-CLi-ionPower Design
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A PCB board next to a checklist clipboard being reviewed before fabrication
NotesPCB Design

A Practical PCB Review Checklist Before You Send It to Fab

A practical PCB review checklist before fabrication: schematic, ERC, footprints, clearance, power, antenna, USB pairs, silkscreen, Gerbers, and BOM.

PCB DesignHardwareChecklistKiCad
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ESP32-S3 reference schematic divided into functional blocks for review
NotesPCB Design

Reading an Open-Source ESP32 Schematic Before Reusing It

An ESP32 TouchDown case study for reviewing an open-source schematic before reuse, covering power, reset, boot, USB, connectors, and tests.

PCB DesignHardwareESP32Open Source
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AQuality32 ESP32 air quality monitor PCB with sensor and display layout
ResourcesPCB Design

AQuality32 - Open-Source ESP32 Air Quality Monitoring Device

Author: Daniel M. Pineda-Tobón, Albeiro Espinosa-Bedoya, John W. Branch-Bedoya

Open-source AQuality32 ESP32 PCB for battery-powered CO2, particulate matter, temperature, and humidity monitoring, validated in HardwareX.

PCB Design
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EJA-M ESP32 buoy PCB for field sensing with solar power and enclosure-ready layout
ResourcesPCB Design

EJA M v1.0 - ESP32 LoRa/GPS Board for a Marine Monitoring Buoy

Author: Leonardo Ward

Open-source PCB design for EJA M v1.0, an ESP32-WROOM-32D board with LoRa, GPS, an RTC, and battery/servo power management, built for an ocean monitoring buoy.

PCB Design
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ESP32 Bit Pirate Dock PCB with voltage level shifting carrier board layout
ResourcesPCB Design

ESP32 Bit Pirate Dock - Voltage-Translating Carrier Board for the ESP32-S3 DevKit

Author: AndreiVladescu

Open-source ESP32 Bit Pirate Dock carrier PCB for ESP32-S3-DevKitC-1 with selectable 1.8V, 3.3V, and 5V I/O translation.

PCB Design
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ESP32 TouchDown touchscreen controller PCB with display and connector layout
ResourcesPCB Design

ESP32 TouchDown - All-in-One ESP32 Capacitive Touchscreen Board

Author: Dustin Watts

Open-source ESP32 TouchDown PCB with ESP32-WROOM-32D, 480x320 capacitive touchscreen, USB-C, microSD, and LiPo charging.

PCB Design
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ESPiezoMeter RS485 field tool PCB for ESP32-C3 Modbus and BLE data logging
ResourcesPCB Design

ESPiezometer - ESP32-C3 Field Validator for RS485 Piezometric Sensors

Author: Armando Blanco

Open-source ESPiezometer PCB for an ESP32-C3 field tool that validates and calibrates RS485 piezometric groundwater sensors on site.

PCB Design
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PatternFlow LED synthesizer PCB with ESP32-S3, controls and LED output connectors
ResourcesPCB Design

Patternflow - Open-Source ESP32-S3 LED Synthesizer PCB

Author: SeungHun Lee (engmung)

Open-source Patternflow ESP32-S3 PCB for HUB75 LED matrix control, four rotary encoders, and real-time generative light patterns.

PCB Design
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Open Book e-reader PCB with Raspberry Pi Pico, e-paper display connector and controls
ResourcesPCB Design

The Open Book - Open-Source Raspberry Pi Pico E-Reader PCB

Author: Joey Castillo (Oddly Specific Objects)

Open-source The Open Book PCB for a Raspberry Pi Pico e-reader with 4.2-inch e-paper display, AAA battery power, and hand-solderable parts.

PCB Design
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Licensed design-file render of the PCF85063A real time clock breakout PCB
ResourcesPCB Design

PCF85063A Breakout Real-Time Clock (RTC) - Compact Real-Time Clock Module

Author: Soldered Electronics

Open-source PCB design for a compact PCF85063A RTC breakout that helps microcontrollers keep accurate time over I2C/Qwiic, including backup battery support.

PCB Design
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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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