# 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

---

## 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

---

## 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

---

## 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.