xterra-overland-dashboard/docs/implementation-roadmap.md

Revised Milestone Order

Milestone 1: ESP32 Hardware Bring-Up

Goal

Verify cargo-controller hardware.

Tasks

• Flash ESP32 firmware
• Verify WiFi AP
• Verify HTTP API
• Verify relay outputs
• Verify DS18B20 framework
• Verify UART initialization

Success Criteria

• ESP32 boots reliably
• Relays operate correctly
• HTTP API responds correctly
• No crashes or watchdog resets

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Milestone 2: JBD/Xiaoxiang BMS Integration

Goal

Replace placeholder battery values with live battery telemetry.

Tasks

• BLE communication
• JBD packet parsing
• Battery SOC
• Voltage
• Current
• Remaining Ah
• Runtime calculations
• Battery temperature

Success Criteria

• Live battery telemetry available
• Battery data exposed through API
• Placeholder battery values removed

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Milestone 3: Pico Hardware Bring-Up

Goal

Verify dashboard hardware.

Tasks

• Display initialization
• Touch initialization
• Buzzer verification

Success Criteria

• Display functional
• Touch functional
• Buzzer functional

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Milestone 4: UART Communications

Goal

Connect Pico and ESP32.

Tasks

• UART transport
• Status requests
• Status responses
• Relay commands
• Error handling
• Timeout detection

Success Criteria

• Live data displayed on Pico
• Relay control operational

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Milestone 5: Dashboard UI

Goal

Create the primary user interface.

Tasks

• Dashboard screen
• Battery screen
• Temperatures screen
• Power screen
• System screen

Success Criteria

• All screens functional
• Navigation stable
• Live updates working

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Milestone 6: DS18B20 Integration

Goal

Implement all production temperature sensors.

Sensors

• Fridge Zone 1
• Fridge Zone 2
• Rear Seat Area
• Outside Air

Success Criteria

• Sensors report correctly
• Sensor failures detected

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Milestone 7: Alarm System

Goal

Implement monitoring and alerting.

Tasks

• Alarm manager
• Alarm overlay
• Buzzer integration
• Communication alarms
• Battery alarms
• Temperature alarms
• Sensor fault alarms

Success Criteria

• Alarms trigger correctly
• Audible alerts function correctly

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Milestone 8: Vehicle Integration

Potential Features

• Ignition state
• OBD-II
• CAN bus
• Fuel level
• Engine data

Future planning only.

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Milestone 9: Future Expansion

Potential Features

• Additional relays
• Inverter control
• Lighting control
• GPS
• Starlink diagnostics
• Home Assistant

Future planning only.