| name | uno-q-hardware |
| description | Arduino Uno Q board pinout and voltage rules — JDIGITAL/JANALOG/Qwiic/JSPI pin tables, PWM pins, 3.3V ADC limits, MPU vs MCU split. Read this before answering any question that names a pin (D0–D21, A0–A5) or voltage. |
Arduino Uno Q Hardware
The Uno Q has two processors that talk over an RPC Bridge.
- MPU (Linux side) — Qualcomm QRB2210, 4× Cortex-A53 @ 2.0 GHz, Debian Linux. Runs Python, AI inference, web servers. MPU I/O is 1.8 V and not accessible from Arduino sketches.
- MCU (Arduino side) — STM32U585, Cortex-M33 @ 160 MHz, Zephyr OS + Arduino Core. Runs
.ino sketches. All Arduino headers (JDIGITAL, JANALOG, JSPI, Qwiic) are 3.3 V.
Sketches always target the MCU. The MPU is where Sensai itself runs.
When to load the references
- Student asks about a specific pin (D-number, A-number) → read
references/pinout.md.
- Student asks about voltage, 5 V sensors, ADC range, or "is it safe" → read
references/voltage-safety.md.
- Writing any sketch that uses
analogWrite, analogRead, I2C, SPI, or Serial → check references/pinout.md for the pin's role first.
Quick facts (use without loading references)
- PWM pins: D3, D5, D6, D9, D10, D11 (marked with
~ on the silkscreen).
- Built-in LED: D13.
- I2C2 (default Wire): D20 (SDA), D21 (SCL).
- Qwiic connector: dedicated I2C4, plug-and-play for Modulino sensors.
- ADC inputs A0–A5: 0–3.3 V only. 5 V on these pins damages the MCU — call this out every time.
Reference files
| File | Contents |
|---|
references/pinout.md | Full JDIGITAL / JANALOG / Qwiic / JSPI tables — pin, MCU port, and alternate function. |
references/voltage-safety.md | 3.3 V vs 5 V rules, MPU↔MCU I/O split, common ways students damage the board. |
