# Hardware Bring-Up Checklist

## ESP32 Cargo Controller

### Compile

* Firmware compiles successfully
* Required libraries installed:

  * ArduinoJson
  * OneWire
  * DallasTemperature

### Upload

* Board: ESP32 Dev Module
* Serial monitor opens at 115200 baud
* Boot message appears

### WiFi AP

Verify ESP32 creates AP:

* SSID: XterraController

### HTTP API

Test:

```
http://192.168.4.1/status
```

Expected:

* JSON response
* Battery placeholder values present
* Relay states present
* Sensor health present
* Network status present

### Relays

Test endpoints:

```
/relay/starlink/on
/relay/starlink/off
/relay/fridge/on
/relay/fridge/off
```

Verify:

* GPIO16 controls Starlink relay channel
* GPIO17 controls Fridge relay channel
* Relay logic is correct
* If relay behavior is backwards, update relay active-high/active-low logic

### DS18B20 Sensors

Verify:

* Sensor bus initializes
* Missing sensors do not crash firmware
* Connected sensors report temperatures
* Sensor fault state works

### UART

Verify:

* UART initializes
* ESP32 does not crash without Pico connected
* Serial JSON protocol works once Pico or USB-UART test is connected

---

## Pico Dashboard

### Pico Boot

Verify:

* Pico 2 W boots
* MicroPython or CircuitPython environment works
* Main script runs

### Display

Verify:

* ST7796S initializes
* Screen fill works
* Text drawing works
* Rotation/orientation is correct

### Touch

Verify:

* FT6336U initializes
* Touch events are detected
* X/Y coordinates match screen orientation
* Bottom navigation zones match expected touch positions

### Buzzer

Verify:

* Active buzzer turns on
* Active buzzer turns off
* Buzzer does not block UI loop

### UART to ESP32

Verify:

* Pico sends status request
* ESP32 responds with status response
* Pico parses response
* Pico updates app state
* Pico sends relay command
* ESP32 toggles relay
* Pico receives relay response

---

## System Integration

### Dashboard

Verify:

* Battery placeholder data displays
* Temperatures display
* Relay states display
* Communication state displays

### Alarms

Verify:

* Communication loss alarm triggers
* Sensor fault alarm triggers
* Fridge high-temp alarm triggers
* Low battery alarm triggers
* Critical alarms trigger buzzer

---

## Do Not Proceed Until

Before moving to production wiring:

* ESP32 firmware boots reliably
* Relays behave correctly
* UART protocol works
* Pico display works
* Pico touch works
* Buzzer works
* No high-current loads pass through ESP32 relay contacts