techmannih/nema34-mounted-stepper-controller
A 48 V USB‑C PD 3.1 EPR NEMA‑34 stepper controller PCB combining STM32/TMC5160 control, external MOSFET motor bridges, protected power and regenerative braking, USB data, telemetry, diagnostics, status LEDs, and buzzer alarms.
- Version
- 0.3.92
- License
- unset
- Stars
- 1
engineering/reference-comparison.json
{
"reviewed_date": "2026-10-11",
"baseline_commit": "0a53acee2ff69f08097d9d3b2407c6b0b190f70f",
"scope": "Design comparison, not hardware qualification or complete reference parity",
"references": [
{
"package": "imrishabh18/rp2040-motor-controller",
"version": "1.0.42",
"release_id": "e8d285f7-c3d8-46f5-9a54-344fdde0124e",
"url": "https://tscircuit.com/imrishabh18/rp2040-motor-controller",
"files": [
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"path": "README.md",
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},
{
"path": "index.circuit.tsx",
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},
{
"path": "schematic/CurrentTelemetrySection.tsx",
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{
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{
"path": "schematic/MotorOutputsSection.tsx",
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{
"path": "schematic/PdVoltageControlSection.tsx",
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"path": "schematic/ProductionTestPoints.tsx",
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{
"path": "schematic/StatusLedSection.tsx",
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{
"path": "schematic/ThermalProtectionSection.tsx",
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{
"package": "imrishabh18/nema-23-stepper-controller",
"version": "1.3.2",
"release_id": "ce2edb82-bc7a-4eb3-9cbd-280f173e6dcd",
"url": "https://tscircuit.com/imrishabh18/nema-23-stepper-controller",
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{
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],
"features": [
{
"id": "separate_usb",
"feature": "Separate POWER and DATA ports",
"status": "implemented",
"evidence": "docs/usb-pd-architecture.md",
"detail": "J1 EPR power; J10 independent USB DATA/MCU supply. Two CC Rd on DATA. Physical compliance remains a separate gate."
},
{
"id": "pd_voltage",
"feature": "Software-selectable PD voltage",
"status": "intentional_difference",
"evidence": "docs/pd-configuration.json",
"detail": "References select 5\u201320 V / 5\u201328 V. This motor design is fixed 48 V / 5 A EPR; firmware rejects other contracts. No arbitrary-voltage UI is promised. TI image remains missing."
},
{
"id": "power_protection",
"feature": "Input protection and reverse blocking",
"status": "implemented",
"evidence": "engineering/power-audit.json",
"detail": "eFuse, independent power permit, reverse-blocked logic supplies and motor-side brake backup. Limits use this board\u2019s own ratings."
},
{
"id": "driver",
"feature": "Motor driver and local thermal paths",
"status": "implemented",
"evidence": "docs/native-decoupling-check.json",
"detail": "Retained TMC5160A/external bridges by user decision; 12 V VSA supply and 58 filled/capped via-in-pad locations. Target-current thermal qualification is open."
},
{
"id": "motor_connector",
"feature": "Keyed motor connector and mating cable",
"status": "implemented",
"evidence": "docs/motor-harness.md",
"detail": "JST VH retained for higher-current target. VHR-4N, SVH-41T-P1.1 and 16 AWG pigtails defined; actual harness not built/tested."
},
{
"id": "temperature",
"feature": "Temperature readout and motor inhibition",
"status": "implemented",
"evidence": "firmware/README.md",
"detail": "TMP102 + U33 hardware inhibit; missing/stale sensor blocks firmware. NEMA17 has software-only board-temperature response; do not remove our independent inhibit."
},
{
"id": "phase_current",
"feature": "Actual signed winding-current readings",
"status": "implemented",
"evidence": "docs/critical-copper-check.json",
"detail": "INA240A1 \u00d72, 5 m\u03a9 telemetry shunts, 100 mV/A nominal. Independent 33 m\u03a9 regulation shunts. Calibration and PWM sampling remain open."
},
{
"id": "rgb",
"feature": "Visible multicolor status",
"status": "implemented",
"evidence": "docs/indicators.md",
"detail": "D16 common-anode RGB, U35 reset-controlled PCA9538 sinks and current limiting. U37 buffers PC13 reset into PD_3V3; host-tested fault/power/suspend behavior. Optical and powered qualification remain open."
},
{
"id": "buzzer",
"feature": "Audible fault alert",
"status": "implemented",
"evidence": "docs/indicators.md",
"detail": "BZ1 active buzzer, Q26 low-side driver, gate pulldown, clamp and local bulk supply. Reset or communication failure silences the driver. Audible/current qualification remains open."
},
{
"id": "power_indicator",
"feature": "Independent logic-power indication",
"status": "implemented",
"evidence": "docs/indicators.md",
"detail": "D17 and R128 independently indicate board V3V3; USB-only MCU power does not light it. Included in the additional 75 mA logic-rail allocation."
},
{
"id": "power_probes",
"feature": "Dedicated PD / VMOTOR / GND measurement pads",
"status": "implemented",
"evidence": "docs/pd-programming.md",
"detail": "Top TP_PD_VBUS, TP_VMOTOR and TP_PWR_GND added with five EEPROM fixture pads; total 19 service pads. Fixture construction and physical probe access remain to be qualified."
},
{
"id": "encoder",
"feature": "Centered underside optional encoder",
"status": "implemented",
"evidence": "docs/assembly-check.json",
"detail": "U18 at (0,0) alone on bottom, C52/C53 on top; all three DNP, excluded from fitted BOM/CPL/paste. AS5047P SPI retained instead of AS5600 I2C."
},
{
"id": "encoder_mechanics",
"feature": "Shaft magnet / holder / working gap",
"status": "open",
"evidence": "docs/motor-assembly.md",
"detail": "Single-shaft 34HS31-6004S1 has no documented rear rotating-shaft attachment. DNP footprint is complete; usable shaft feedback is not."
},
{
"id": "programming",
"feature": "MCU reset and programming recovery",
"status": "implemented",
"evidence": "firmware/README.md",
"detail": "STM32 internal flash, SWD/NRST service pads and SW1; RP2040 BOOTSEL/UF2 circuitry is not copied. USB CDC setup is not a firmware flasher."
},
{
"id": "pd_programming",
"feature": "Blank PD EEPROM programming and approved image",
"status": "open",
"evidence": "docs/pd-programming.md",
"detail": "U36 isolates both controller I2Cc wires. EEPROM-side SDA/SCL, VREF, GND and isolation pads plus a fixed-5 V blank-board procedure are implemented. TI full-flash image, built fixture and readback/APP-boot evidence remain missing."
},
{
"id": "industrial",
"feature": "Retain only defined external functions",
"status": "open",
"evidence": "docs/connector-harnesses.md",
"detail": "J7 and remaining STEP/DIR/enable/home/limit stages removed from current TSX. Onboard SPI ramp and local START/STOP replace the undefined external command equipment; native copper refresh pending."
},
{
"id": "mechanics",
"feature": "Motor mounting, holes and cable/tool access",
"status": "open",
"evidence": "docs/motor-assembly-check.json",
"detail": "Four PCB drills and exact motor-axis alignment retained. Unsupported front-post/adapter/clamp hardware withdrawn; no rear fastener dimensions invented. Alignment-only preview, physical mounting and retention unverified."
},
{
"id": "thermal",
"feature": "Heatsink, enclosure and brake load",
"status": "open",
"evidence": "docs/power-validation.md",
"detail": "References\u2019 thermal vias/clearance method applies; their motor current, bulk capacitor and heatsink assumptions do not. Qualified thermal envelope and external brake cooling are missing."
},
{
"id": "firmware",
"feature": "Executable motor / interface application",
"status": "open",
"evidence": "firmware/README.md",
"detail": "Executable bounded local START/STOP/internal SPI ramp path implemented and host-tested; shipped STM32 binary remains locked pending TI image and powered qualification. Reference READMEs include no executable motion firmware."
},
{
"id": "markings",
"feature": "Visible labels, branding and net names",
"status": "implemented",
"evidence": "board-markings.tsx",
"detail": "Knockout POWER/DATA labels, connector markings and explicit route net identities already checked; every new service pad needs its own visible label."
},
{
"id": "fabrication",
"feature": "Sourcing, assembly files and routed DRC",
"status": "open",
"evidence": "docs/verification.json",
"detail": "Current source ECO invalidates older native routing/release evidence. New route, full review and stock approval are pending; no orderable release."
}
],
"review_lines": [
{
"id": "encoder_bottom_dnp",
"request": "Small encoder on bottom, doNotPlace",
"features": [
"encoder"
]
},
{
"id": "reference_boards",
"request": "Use Rishabh\u2019s reference boards",
"features": [
"separate_usb",
"pd_voltage",
"power_protection",
"driver",
"motor_connector",
"temperature",
"phase_current",
"rgb",
"buzzer",
"power_indicator",
"power_probes",
"encoder",
"encoder_mechanics",
"programming",
"pd_programming",
"industrial",
"mechanics",
"thermal",
"firmware",
"markings",
"fabrication"
]
},
{
"id": "encoder_center",
"request": "Perfectly centered, correct motor encoder arrangement",
"features": [
"encoder",
"encoder_mechanics"
]
},
{
"id": "justify_connectors",
"request": "Explain J7, J2 and every additional connector",
"features": [
"motor_connector",
"industrial",
"thermal"
]
},
{
"id": "specified_interfaces",
"request": "Only specified interfaces",
"features": [
"separate_usb",
"motor_connector",
"industrial"
]
},
{
"id": "assembly_motor_connection",
"request": "More assembly work; actual motor connection",
"features": [
"motor_connector",
"mechanics",
"encoder_mechanics"
]
},
{
"id": "discover_other_issues",
"request": "Carefully discover and resolve remaining issues before renewed review",
"features": [
"rgb",
"buzzer",
"power_indicator",
"power_probes",
"pd_programming",
"firmware",
"thermal",
"mechanics"
]
},
{
"id": "review_paused",
"request": "Review paused until issues addressed",
"features": [
"rgb",
"buzzer",
"power_indicator",
"power_probes",
"pd_programming",
"firmware",
"thermal",
"mechanics",
"encoder_mechanics"
]
}
]
}
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