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7. I/O and Peripheral Guide

• GPIO numbering: header pins labeled; use manufacturer mapping in board docs.
• Analog inputs: 12-bit ADC, 0–3.3 V range. For higher voltages use voltage divider.
• PWM outputs: frequency up to 1 kHz; suitable for LED dimming, motor control (use drivers for motors).
• UART: default baud 115200; TX/RX pins as labeled.
• I2C: 400 kHz, pull-ups present (verify if external pull-ups required).
• SPI: Mode 0 default, max 10 MHz.
• USB-C: supports data and power; host mode for flash drives.

Best practices:

• Use level shifters for 5 V peripherals.
• Keep grounds common between JUFE and external circuits.
• Use current-limited power supply when testing motors or inductive loads.

12. Maintenance and Firmware Updates

• Check updates monthly or enable auto-update on non-critical systems.
• Backup before major firmware upgrades.
• Reboot schedule: weekly reboots can improve reliability for long-running deployments.
• Cleaning: power off before cleaning; use dry cloth; avoid solvents.

9. Networking and Remote Access

• Secure the device: change default passwords, disable open AP after setup.
• Use WPA2/WPA3 for Wi‑Fi networks.
• SSH keys: prefer key-based auth; disable password auth in production.
• Firewall: built-in firewall blocks unused ports by default; configure via dashboard.
• Remote access options:
  • VPN: connect JUFE to your VPN for secure remote management.
  • Cloud service: optional encrypted telemetry to cloud with token-based auth.
  • mDNS: device.local hostname for local discovery.

11. Power Management

• Sleep modes: deep sleep reduces consumption to <10 mA; wake on RTC or GPIO.
• Startup scripts run after wake; preserve state to /data/state.json before sleep.
• Battery use: recommended battery management IC for safe charging and monitoring.

6. User Interface and Modes

• Modes:
  • Device Mode: headless operation with local scripts.
  • Desktop Mode: attach monitor via optional HDMI adapter for GUI access (if supported).
  • OTA Mode: accept over-the-air firmware and app updates.
• Web dashboard: provides status, logs, sensor readings, and configuration.
• CLI: access via SSH; common commands:
  • system status
  • jufe-update
  • jufe-restart
  • jufe-log --follow