v0.1 · Language and compiler

Hardware, defined in software.

Defining hardware in the age of AI.

Circutri← Personal/07-motor-controller

Variant Bench · Prototype ▾local · synced

07-motor-controller

⌄ boards

MotorControllerBoard.circuit

Netclasses.circuit

⌄ components

CanPhy.circuit

CanPort.circuit

Controller.circuit

DebugHeader.circuit

HBridge.circuit

Logic5V.circuit

MotorPort.circuit

PowerInput.circuit

PowerRegulation.circuit

⌄ modules

MotorController.circuit

⌄ variants

Bench.circuit

Enclosed.circuit

Release.circuit

MotorControllerBoard.circuit×

1import robotics::modules::{MotorController}

2import robotics::netclasses::{HighCurrent, CANDifferential}

4/// MotorControllerBoard: one brushed motor on a 24V robot bus, commanded

5/// over CAN.

6board MotorControllerBoard:

7 schematic = MotorController

9 requirements {

10 operating_temperature = -20C..70C

12 power_in: accepts 20V..28V ← 28V exceeds U3's 26V input

13 power_in: draws {

14 continuous: <= 10A

15 peak: <= 20A

16 }

17 }

19 pcb {

20 layers = 4

21 copper = 1oz

22 thickness = 1.6mm

23 }

25 netclasses {

26 schematic.motor_power: HighCurrent

27 can_bus: CANDifferential

28 }

Problems 1ChecksOutput

FAIL1 error · 16 checked

partspartexplainagent

› Keep the bus at 28V; make the regulator take it.

circutri check ✗

●U3 tops out at 26V. Swapping it for an LMR36015 (60V).

circutri check ✓

✗ 1 error 16 domains checked · Bench · PrototypeSaved · auto save · circuit

Weeks of schematicsEvery wire placed and checked by hand.
Datasheets, read by handHundreds of pages, every limit copied out.
Ordered. Assembled. Powered on.Then it fails on the bench.
One more Missed derating, a wrong footprint, a late night.

AO3400

8.7 Typical Characteristics

Figure 8-1. Efficiency, VOUT = 1.8 V

Figure 8-2. Efficiency, VOUT = 3.3 V

Figure 8-3. Load regulation

Figure 8-4. Line regulation

Figure 8-5. Switching frequency

Figure 8-6. Quiescent current

STM32F411

6 Pin Configuration and Functions

NAMENO.I/ODESCRIPTION

PVIN1P

PVIN2I

AVIN3O

EN4P

SS5I

FB6O

AGND7P

PG8I

SW9O

SW10P

PGND11I

VOS12O

BME280

BME280Combined humidity and pressure sensor

1 Features

2 Applications

3 Description

PART NUMBERPACKAGEBODY SIZE

Simplified schematic

Efficiency vs output current

TPS62133

TPS621333-A step-down converter in 3 × 3 mm QFN package

1 Features

2 Applications

3 Description

PART NUMBERPACKAGEBODY SIZE

Simplified schematic

Efficiency vs output current

USBLC6-2

11 Mechanical, Packaging, and Orderable Information

AP2112K

8.7 Typical Characteristics

Figure 8-1. Efficiency, VOUT = 1.8 V

Figure 8-2. Efficiency, VOUT = 3.3 V

Figure 8-3. Load regulation

Figure 8-4. Line regulation

Figure 8-5. Switching frequency

Figure 8-6. Quiescent current

LIS3DH

6 Pin Configuration and Functions

NAMENO.I/ODESCRIPTION

PVIN1P

PVIN2I

AVIN3O

EN4P

SS5I

FB6O

AGND7P

PG8I

SW9O

SW10P

PGND11I

VOS12O

RefValueMakerMPNQty

C14.7µFDiodes56631-7312

C222µHYageo76024-5217

L3LDO 3V3Diodes53388-4378

J410kΩOnsemi14683-3562

D522µHDiodes96991-5911

D6MCUST24130-8626

D722µHDiodes18622-6975

D8USB-CTI80602-6711

D9USB-CDiodes24634-9837

U10LDO 3V3Bourns31611-5137

D11MCUST57687-8955

R12MCUVishay59936-6231

R1310kΩOnsemi39091-8976

C14USB-CWürth52807-9565

D15LDO 3V3ST63444-2941

J16TVSWürth30044-9535

U1722µHSamsung68904-7022

L18MCUYageo69304-8718

J19TVSDiodes85706-1721

J204.7µFST19104-4248

D21100nFST17579-9661

J22LDO 3V3ST78874-7996

D2310kΩYageo96134-1728

U244.7µFOnsemi63304-1322

C25MCUVishay?4

L26TVSYageo33531-7495

U27USB-CWürth35861-3654

J28MCUVishay43693-3251

R29100nFSamsung22886-7328

C30MCUDiodes45912-7228

C31USB-CBourns76965-9518

C32USB-CYageo83151-2862

U33TVSDiodes90415-4906

R344.7µFMurata?7

D35USB-CST61368-7835

C36USB-CMurata56461-3733

C37MCUSamsung78544-2427

L38LDO 3V3Vishay80386-2765

D39100nFVishay73265-6017

J40LDO 3V3Yageo28944-1194

L4122µHOnsemi76701-4362

C42TVSSamsung56827-6476

R4310kΩWürth73663-8853

C44LDO 3V3Murata41625-9313

D45USB-CSamsung77877-9278

D46TVSWürth63267-1463

L47TVSST58148-6813

D48USB-CBourns23407-5484

D4910kΩOnsemi55748-7955

R504.7µFOnsemi73087-6451

C51TVSVishay61442-3596

R5210kΩMurata93207-8548

D5310kΩTI31331-8502

C544.7µFYageo84776-9675

J55LDO 3V3Yageo74872-7017

J56100nFSamsung97538-4355

L5710kΩYageo71533-4348

J584.7µFDiodes74752-9025

J5910kΩYageo55329-8285

R6010kΩSamsung41497-2382

One more .

MeetCircutri

Write the board as code. A compiler checks it against real parts.

Command line

Today

One command line.

Your board is filesPlain .circuit text, in your own Git.
circutri checkReal part data, every rail and pin. Caught before it's ordered.
circutri buildCompiled like software, the same bytes every time.
circutri exportNextGerbers, versioned with the code.

~/iot-sensor-nodezsh

~/iot-sensor-node $

Your AI

Today

Bring your own AI.

Works with Claude Code, Codex, Gemini CLI, or the agent you already use.
Through Circutri's MCP serverYour agent drafts with the same commands you use.
Light on tokensIt gets what failed and why, nothing else.
You stay in chargeEvery change is a diff you approve, then the check passes.

~/iot-sensor-nodezsh

~/iot-sensor-node $ tree -I 'build|registry'

├── Circutri.toml

├── Circutri.lock

├── boards

│ └── SensorNode.circuit

├── components

│ ├── BME280.circuit

│ ├── BatteryPack.circuit

│ ├── Charger.circuit

│ ├── DebugHeader.circuit

│ ├── PowerPath.circuit

│ ├── PowerRegulation.circuit

│ ├── STM32F411.circuit

│ ├── StatusIndicator.circuit

│ └── UsbPower.circuit

├── modules

│ └── MainBoard.circuit

└── variants

└── SmartHomeDefault.circuit

4 directories, 14 files

~/iot-sensor-node $ circutri check

circutri loading workspace `02-iot-sensor-node` (edition 1.0, 12 sources)

circutri warning[CIR-SCH-2003]: 57 stresses on 42 elements of `SensorNode/SmartHomeDefault` were not judged

--> boards/SensorNode.circuit:3:17

3 | schematic = MainBoard

| ^^^^^^^^^ analysed here

= note: each element and what it was not judged for is listed under `gaps:` in the summary

= help: state what its part leaves out, or judge the stress by hand against the datasheet

circutri ✓ check passed: 0 errors, 1 warning in 0.12s

checked: syntax, imports, registry, part library, definitions, buses, linking, zipping, resolution, footprints, symbols, connectivity, power, current, variant, requirements

~/iot-sensor-node $ circutri build

circutri loading workspace `02-iot-sensor-node` (edition 1.0, 12 sources)

circutri warning[CIR-SCH-2003]: 57 stresses on 42 elements of `SensorNode/SmartHomeDefault` were not judged

--> boards/SensorNode.circuit:3:17

3 | schematic = MainBoard

| ^^^^^^^^^ analysed here

= note: each element and what it was not judged for is listed under `gaps:` in the summary

= help: state what its part leaves out, or judge the stress by hand against the datasheet

circutri wrote build/SensorNode/SmartHomeDefault/SensorNode.design.json

circutri wrote build/SensorNode/SmartHomeDefault/build-manifest.json

circutri ✓ build passed: 0 errors, 1 warning in 0.13s

checked: syntax, imports, registry, part library, definitions, buses, linking, zipping, resolution, footprints, symbols, connectivity, power, current, variant, requirements

~/iot-sensor-node $ circutri export

circutri loading workspace `02-iot-sensor-node` (edition 1.0, 12 sources)

circutri wrote export/SensorNode/SmartHomeDefault/F_Cu.gbr

circutri wrote export/SensorNode/SmartHomeDefault/B_Cu.gbr

circutri wrote export/SensorNode/SmartHomeDefault/F_Mask.gbr

circutri wrote export/SensorNode/SmartHomeDefault/B_Mask.gbr

circutri wrote export/SensorNode/SmartHomeDefault/F_Silkscreen.gbr

circutri wrote export/SensorNode/SmartHomeDefault/Edge_Cuts.gbr

circutri wrote export/SensorNode/SmartHomeDefault/SensorNode.drl

circutri ✓ export passed: 6 layers, 1 drill file in 0.21s

~/iot-sensor-node $

Everywhere

macOS, Windows, LinuxNative on your desk, with each system's own controls.
iPadReview a board wherever you are.
The webNothing to install: the same files, the same checks.

Inside the app

Today

Checked against real parts.

Every rail checkedFollowed from its source through every load, at its worst case.
The schematic, drawn from the codeChange a line and the drawing follows.
Parts that carry their datasheet2,000+ and growing, each figure traced to its page.

Circutri← Personal/07-motor-controller

Variant Bench · Prototype ▾local · synced

07-motor-controller

⌄ boards

MotorControllerBoard.circuit

Netclasses.circuit

⌄ components

CanPhy.circuit

CanPort.circuit

Controller.circuit

DebugHeader.circuit

HBridge.circuit

Logic5V.circuit

MotorPort.circuit

PowerInput.circuit

PowerRegulation.circuit

⌄ modules

MotorController.circuit

⌄ variants

Bench.circuit

Enclosed.circuit

Release.circuit

MotorControllerBoard.circuit×

1import robotics::modules::{MotorController}

2import robotics::netclasses::{HighCurrent, CANDifferential}

4/// MotorControllerBoard: one brushed motor on a 24V robot bus, commanded

5/// over CAN.

6board MotorControllerBoard:

7 schematic = MotorController

9 requirements {

10 operating_temperature = -20C..70C

12 power_in: accepts 20V..28V ← 28V exceeds U3's 26V input

13 power_in: draws {

14 continuous: <= 10A

15 peak: <= 20A

16 }

17 }

19 pcb {

20 layers = 4

21 copper = 1oz

22 thickness = 1.6mm

23 }

25 netclasses {

26 schematic.motor_power: HighCurrent

27 can_bus: CANDifferential

28 }

Failcircutri checkdebug.vtref: 1mA → 500mA4 errors · 1 warning

CIR-PWR-1010components/BME280.circuit:19rail `climate_sensor.c_vdd.p1` carries ≈590.29mA at its peak, more than the 480mA its source may deliver

CIR-PWR-1010components/UsbPower.circuit:10rail `usb.vbus` carries ≈591.92mA at its peak, more than the 400mA its source may deliver

CIR-PWR-1026components/PowerRegulation.circuit:5`power_tree.ldo` reaches 225C at a 40C ambient, above its 150C junction rating

CIR-PWR-1034components/PowerPath.circuit:7`power_path.mux` output rail has 16µF, below the ≈22.87µF its switchover needs

CIR-SCH-2003boards/SensorNode.circuit:357 stresses on 42 elements of `SensorNode/SmartHomeDefault` were not judged

power_tree.ldo.VOUT · peak load600mA × 0.8 = 480mA allowed

debug.conn.VTREF500mA
controller.mcu34.5mA
led_indicators[0].r_limit19.8mA
led_indicators[2].r_limit17.5mA
4 more loads18.5mA

16 domains checked · unchecked: formatting

Problems 1ChecksOutput

FAIL1 error · 16 checked

partspartexplainagent

Search parts, makers, packages

LMR36015SwitchingRegulator

DRV8701MotorDriver

CSD18540Q5BNMosfet

TCAN1042CanTransceiver

STM32G431Microcontroller

WSL2512ShuntResistor

EEU-FR1H221Capacitor

CL31B106KBHNNNECapacitor

SRP7028A 4R7MInductor

✗ 1 error 16 domains checked · Bench · PrototypeSaved · auto save · circuit

Standards

Switch the variantBench, enclosed, release: one click.
Re-judged at onceEvery standard checked against the new variant.
Caught. Fixed. Passed.RoHS failed; the agent fixed it.
One design, every variantFor robots, sensors, devices, whatever you build.

Circutri — 07-motor-controller

app.circutri.com/p/07-motor-controller

Circutri← Personal/07-motor-controller

Variant Bench · Prototype ▾local · synced

07-motor-controller

⌄ boards

MotorControllerBoard.circuit

Netclasses.circuit

⌄ components

CanPhy.circuit

CanPort.circuit

Controller.circuit

DebugHeader.circuit

HBridge.circuit

Logic5V.circuit

MotorPort.circuit

PowerInput.circuit

PowerRegulation.circuit

⌄ modules

MotorController.circuit

⌄ variants

Bench.circuit

Enclosed.circuit

Release.circuit

Board · MotorControllerBoard×

[ IPC-2152 · track width ]PASS

[ Derating · 80% ]PASS

[ IPC-2221 · creepage ]PASS

Problems 0ChecksOutput

PASS0 errors · 16 checked

partspartexplainagent

Search parts, makers, packages

LMR36015SwitchingRegulator

DRV8701MotorDriver

CSD18540Q5BNMosfet

TCAN1042CanTransceiver

STM32G431Microcontroller

WSL2512ShuntResistor

EEU-FR1H221Capacitor

CL31B106KBHNNNECapacitor

SRP7028A 4R7MInductor

✓ 0 errors 16 domains checked · Bench · PrototypeSaved · auto save · circuit

Meet your standards.

Workflows

The whole loop runs from one command line.

The same commands serve you, your agent and your CI. Checking and building never touch the network.

Start a project

Start from a workspace, not a blank canvas

One command lays out the manifest, the board and the module folders. Your agent drafts the first module in .circuit; you read it, change it and keep it in Git like any other source.

$circutri new iot-sensor-node

No silent success

Any error exits non-zero and writes no artifact. An unknown field is an error, never ignored.

Stable error codes

Every finding has a CIR code. A released code never changes meaning and is never reused.

Byte-identical output

Same sources, same registry, same toolchain: the same bytes on every platform.

Locked and offline

A locked workspace never resolves differently and compiles with no network at all.

Verified part data

A part is usable only after its pins, classes and limits pass verification.

Honest results

PASS, FAIL or DEFERRED, and every run lists the domains it did not check.

Circutri

Built for the age of AI.

Blog

Why PCB design needs a new language

I tried schematic tools and code-first tools. Both kept losing the thing I cared about most, and that is why Circutri is a language of its own.

Read the article

Hardware, defined in software.

MeetCircutri

One command line.

Bring your own AI.

Runs natively on

Checked against real parts.

Meet your standards.

The whole loop runs from one command line.

Start from a workspace, not a blank canvas

No silent success

Stable error codes

Byte-identical output

Locked and offline

Verified part data

Honest results

Why PCB design needs a new language