Stop Redesigning the Same Circuits
KiCad 10 Design Block-ready circuits with native workflow support: schematics, PCB layouts, BOMs, and design notes for the most common hardware building blocks.
Recommended starting point
Start fast with the ESP32-S3 Core Controller
Best for first-time users who want a practical connected board foundation with USB-C programming, Wi-Fi/BLE, and clear integration notes.
Why this is the easiest start
- Free to start and immediately usable in a real project.
- Includes clear bring-up guidance and practical pinout notes.
- Pairs naturally with the full ESP32 starter bundle later.
Choose Your Approach
Templates
Download KiCad source files and integrate them into your own design. Full control, customizable, perfect for learning.
PCB Composer
Select tiles, configure signals, and receive a routed board. No KiCad knowledge required. Production files ready in 24h.
How PCB Composer works
Select your tiles. We compose, route, and deliver production files in 24h.
Step 1
Select tiles
Pick from our library of production-ready circuit modules — power, MCU, analog, connectivity.
Step 2
Configure signals
Map GPIO, power nets, and I2C/SPI connections. Power rails are auto-resolved.
Step 3
Get your files
We compose, route, DRC-check, and deliver JLCPCB-ready Gerbers + BOM + assembly files in 24h.
Every project re-invents the same wheel
MPPT charger, buck supply, ESP32S3 core, switching stage, power telemetry. You've designed each one before - or spent hours hunting for a verified reference you can trust.
These templates are the circuits we reach for in professional production hardware: clean layouts, pre-screened supplier BOMs, and design notes explaining every non-obvious decision.
All Templates
ESP32-S3 Core Controller
Production-ready ESP32S3 core with USB-C programming, auto-download circuit, and documented RF keep-out guidance.
MPPT Solar Charger — Acid Output
MPPT charger block optimized for solar input to acid-battery charging workflows in embedded power systems.
Buck Power Supply 3.3V/5V 2A
Dual-output buck supply block providing regulated rails for digital and peripheral sections.
Low-side Switch 5A 24V
Low-side switching block for pumps, valves, fans, and other inductive or resistive loads up to 24V/5A class.
Current/Power Measurement 5A 25V
Measurement block for current and power telemetry in embedded power systems.
Battery fuel gauge + gas gauge IC
USB-C PD sink controller
Don't see what you need?
Request a custom template — describe the circuit and we'll build it.
Request a templateSave with Bundles
Pre-assembled sets of templates that work together. Save up to 25 % compared to buying individually.
Power Pack
-32%Power subsystem set for greenhouse-style controllers: MPPT charger + buck regulation + low-side switching.
ESP32 Complete System
-21%Core controller plus supporting power, measurement, and switching blocks for full system integration.
IoT Starter Bundle
-19%Starter stack for connected deployments: MPPT input + buck conversion + ESP32S3 control.
Greenhouse Controller — built entirely from templates
A complete wireless greenhouse monitoring and control system designed by combining five blocks from this catalog.
The build log documents every integration decision: how 0120, 0101, 0110, 0010, and 0140 fit together on a single board.
What every template includes
KiCad Schematic
Fully annotated with selection notes and test-point references.
PCB Layout
2-layer, DRC clean, Gerber-ready for JLCPCB / PCBWay / Aisler.
BOM (Excel + CSV)
Pre-screened suppliers — Mouser, TME, Farnell, plus alternates.
Design Notes PDF
Component selection rationale, integration tips, and known pitfalls.
3D STEP Model
Ready for Fusion 360, FreeCAD, or any MCAD tool for enclosure work.
Lifetime updates
BOM revision corrections and schematic improvements pushed free.
What customers get
A practical starting point, not just a file download
Customers use these templates to cut down design churn, reduce bring-up risk, and move faster from concept to a testable board.
Production-minded starting files
Each block includes schematics, PCB layout context, and enough structure to plug into a real project immediately.
Clear design notes
You get guidance on layout choices, bring-up steps, and common pitfalls instead of raw files only.
Reusable building blocks
The catalog is designed so you can combine modules into larger systems without re-solving the same problems.
Faster validation
The result is a cleaner path to prototyping, debugging, and production handoff for your hardware team.
Need a custom template or integration help?
We offer custom template design and hardware design services for teams who need something beyond the catalog.
Frequently Asked Questions
What's the difference between a template and an orderable file?
A template is a KiCad source package (schematic, PCB layout, BOM, design notes) — you download it and integrate it yourself. An orderable file from PCB Composer is a professionally routed multi-tile board delivered as Gerbers + BOM + CPL ready to upload directly to JLCPCB. No KiCad involved.
Do I need KiCad to use the templates?
Yes — templates are KiCad 9/10 source files. If you want production-ready files without opening KiCad, use PCB Composer instead.
Do I need KiCad to use PCB Composer?
No. PCB Composer is fully browser-based. You select tiles, configure connections, and we handle all KiCad work on the backend. You receive a ZIP with Gerbers, BOM, and assembly files.
Is the Composer output production-ready?
Every composition goes through automated DRC validation and a human review step before delivery. The output is JLCPCB-compatible and has been verified against the same board rules used in production hardware.
What about mixed-signal boards (e.g. ADC + MCU)?
PCB Composer flags mixed-signal tile combinations and enforces analog/digital ground separation rules automatically. The reviewer checks keep-out zones and star-point connections before approving.
Can I buy the source files for a Composer board?
Yes — after checkout you can purchase the individual templates used in your composition. The order confirmation includes a cross-sell link to each template.