Expected duration: 1 - 2 weeks Summary Production-ready carrier board for Raspberry Pi Compute Module 5 (CM5). All sensing is integrated on the PCB (no modules): MQ-2-class gas sensor front-end with heater driver, MAX9814-class mic preamp + electret mic, PIR motion circuit, and BME280 T/P/H (I²C). Board provides 4× USB 3.x Type-A via a PCIeattached USB host and powers from USB‑C 5 V. Includes a GPIO user push‑button and RGB status LED. Must-Have Features • Compute: CM5 on mating connectors; follow CM5 datasheet pinout, GPIO_VREF rules, and rail budgets. • USB: PCIe Gen2 ×1 → USB 3.0 host (e.g., VIA VL805‑Q6 + SPI NOR) → 4× SS Type‑A; per‑port VBUS power switch (adj. ILIM ≈1.0–1.2 A), PPTC, VBUS TVS, and ESD; optional SS common‑mode chokes. • Integrated sensors (no modules): MQ‑2‑class gas element + MOSFET heater driver + ADC interface; MAX9814‑class mic preamp + electret; BME280 (I²C) for T/P/H; digital PIR (preferred) or discrete RE200B + BISS0001. • User I/O: momentary push‑button to GPIO22 (reset/user input) and RGB LED on GPIO5/6/13 with series resistors; also expose CM5 PWR_Button (pin 92) for soft power and optional LED_nACT (pin 21) / LED_nPWR (pin 95, buffered). • Power: USB‑C 5 V sink (RD pulldowns), input TVS + eFuse; local 3.3 V rail sized for sensors/logic. • Manufacturing: full package (schematic PDF + source, layout, Gerbers, drill, stack‑up, impedance targets, BOM with MPNs, centroid, assembly drawings, 3D STEP).
Proposal Checklist • EDA tool/version; 1–2 relevant USB3/PCIe + analog (audio/sensors) projects. • Your PIR approach (digital vs. discrete) with part suggestions. • USB per-port power path (switch, PPTC, TVS, ESD) and ILIM value you propose. • Timeline per milestone; fixed-price bid; two rounds of review included.
Ref: Raspberry Pi Compute Module 5 Datasheet, 27 Nov 2024: https://datasheets.raspberrypi.com/cm5/cm5-datasheet.pdf Raspberry Pi Compute Module 5 IO Board documentation, 27 Nov 2024: https://datasheets.raspberrypi.com/cm5/cm5io-datasheet.pdf
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