Predictive Maintenance Device
Thought for 7 sec
I’ll freeze the modular interface standard, select the carrier components, calculate the verified power budget, build and wire the complete carrier schematic, then run connectivity/ERC checks and resolve concrete issues.
Worked for 2 mins 4 sec
Created a project doc
Block Diagram
Block Diagram
Carrier Architecture
Functional Groups and Sourcing Gate
Inter-block Nets
Power:
24V_RAW, 24V_PROT, FIELD24V_S1..S4, 5V, MODEM_VBAT, 3V3, GND, ISO_5V, ISO_GND.Buses:
I2C_SDA/SCL, SPI_SCK/MOSI/MISO, per-slot SLOTn_CS/INT/EN, CELL_TX/RX, RS485_TX/RX/DE, USB_D+/D-.Execution is blocked because the account has no available ACUs. The universal POC/MVP requirements and modular architecture are documented, but no schematic components or nets were added.
Remaining work:
- Finalize component selections and module connector pinout
- Calculate the datasheet-based power budget
- Build and wire the carrier schematic
- Run ERC/connectivity verification
- Create firmware starter and board bring-up files
Add ACUs to resume from this exact scope.
Add ACUs
Estimate ACU needs
Review documented requirements
No schematic yet
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Block Diagram
Carrier Architecture
Text
24 VDC FIELD INPUT -> fuse / reverse-polarity / surge TVS / EMI filter -> protected 24V bus -> switchable current-limited FIELD_24V to four expansion slots -> 24V-to-5V synchronous buck (cellular bursts + modules) -> 5V rail -> 3.3V regulator -> ESP32-S3, storage, RTC, logic -> dedicated cellular rail converter -> LTE modem USB-C service (ESD + CC) <-> ESP32-S3 native USB ESP32-S3 <-> Wi-Fi external antenna ESP32-S3 <-> LTE modem UART + PWRKEY/RESET/STATUS; modem <-> nano-SIM + antenna ESP32-S3 <-> microSD (SPI) ESP32-S3 <-> RTC (I2C + backup cell) ESP32-S3 <-> isolated RS-485 transceiver <-> TVS/termination/bias <-> field connector ESP32-S3 <-> four keyed expansion slots: shared SPI/I2C, per-slot CS/INT/EN, module-ID convention, 3V3, 5V, GND, and independently protected/switched FIELD_24V Indicators/debug: power, status, network, cellular, storage, fault; critical rail and bring-up test points
Functional Groups and Sourcing Gate
Table
| Block | Reference classification | Decision |
|---|---|---|
| Input protection / 24V power | Pending reference search | Import exact/close reference if standalone; otherwise datasheet design |
| ESP32-S3 / native USB | Pending reference search | Import exact/close reference if standalone; otherwise datasheet design |
| Cellular / SIM | Pending reference search | Library parts and modem datasheet; no daughterboard |
| Storage / RTC / supervisor | Pending reference search | Library parts and datasheets |
| Isolated RS-485 | Pending reference search | Import exact/close reference if standalone; otherwise datasheet design |
| Expansion interfaces | None expected | Carrier-specific from scratch using library connectors/protection |
| Indicators / debug | None expected | From scratch |
Inter-block Nets
Power:
24V_RAW, 24V_PROT, FIELD24V_S1..S4, 5V, MODEM_VBAT, 3V3, GND, ISO_5V, ISO_GND.Buses:
I2C_SDA/SCL, SPI_SCK/MOSI/MISO, per-slot SLOTn_CS/INT/EN, CELL_TX/RX, RS485_TX/RX/DE, USB_D+/D-.Carrier Architecture
Functional Groups and Sourcing Gate
Inter-block Nets
