# Hardware Notes

## Core Components

- Arduino MKR1000
- SH1106 OLED display
- AM2302 temperature and humidity sensor
- Two momentary buttons for user input

## Planned Responsibilities

### Arduino MKR1000

- Main controller
- Sensor reading
- Display updates
- Button input handling
- Network connectivity for time and weather data

### SH1106 OLED Display

- Render the current screen
- Present concise text-based information

### AM2302 Sensor

- Provide ambient temperature
- Provide ambient humidity

### Buttons

- `Next` button for navigation
- `Select` button for action or mode selection

## Wiring Status

The physical wiring is already assembled. Current documented wiring is:

## Button Wiring

### Select button

- Signal pin: `A5`
- Wiring: pull-up with `10K` resistor

### Next button

- Signal pin: `A4`
- Wiring: pull-up with `10K` resistor

## Sensor Wiring

### AM2302

- Measurement/data pin: `A3`
- `VCC` -> `3V3`
- `GND` -> `GND`

## Display Wiring

### SH1106

- Interface: `I2C`
- `SCK` -> `SCL`
- `SDA` -> `SDA`
- `VCC` -> `5V`
- `GND` -> `GND`

## Ground

All component ground pins are connected to common `GND`.

## Assumptions To Verify Later

- The SH1106 module is compatible with the MKR1000 voltage levels
- The AM2302 is powered within its supported operating range
- The button pull-up arrangement matches the intended firmware logic
- Available pins are sufficient for the display, sensor, and both buttons

## Risks To Keep In Mind

- OLED modules may vary by interface and initialization details
- Sensor timing can be sensitive depending on the library used
- Network-based features may require retry logic and fallback screen states