# reTerminal DM4 Buzzer Control - Jira Summary

## Summary

Implemented buzzer control functionality for reTerminal DM4 device with test scripts and documentation.

## Device Information

- **Model:** reTerminal DM4 (Raspberry Pi CM4)
- **Buzzer Location:** Bottom right corner of screen
- **Control Path:** `/sys/class/leds/usr-buzzer/brightness`
- **Control Method:** Linux LED subsystem (on/off only)

## Implementation

### Test Scripts Created

1. **Bash Test Script** (`test_buzzer.sh`)
   - Location: `/home/pi/buzzer/test_buzzer.sh` on device
   - Tests: 8 different buzzer patterns (single, double, triple, long, rapid, slow, success, error)
   - Usage: `ssh guard "/home/pi/buzzer/test_buzzer.sh"` or `/home/pi/buzzer/test_buzzer.sh`

2. **Python Test Script** (`test_buzzer.py`)
   - Location: `/home/pi/buzzer/test_buzzer.py` on device
   - Same test patterns as bash script
   - Usage: `ssh guard "python3 /home/pi/buzzer/test_buzzer.py"` or `python3 /home/pi/buzzer/test_buzzer.py`

### Basic Control Commands

```bash
# Turn ON
echo 1 | sudo tee /sys/class/leds/usr-buzzer/brightness

# Turn OFF
echo 0 | sudo tee /sys/class/leds/usr-buzzer/brightness

# Check Status
cat /sys/class/leds/usr-buzzer/brightness  # 0=OFF, 1/255=ON
```

### Python Control Example

```python
import subprocess
import time

BUZZER = '/sys/class/leds/usr-buzzer/brightness'

def beep(duration=0.2):
    subprocess.run(['sudo', 'tee', BUZZER], input='1', text=True)
    time.sleep(duration)
    subprocess.run(['sudo', 'tee', BUZZER], input='0', text=True)
```

## Common Use Cases

- **Success Alert:** 2 short beeps
- **Error Alert:** 3 fast beeps
- **Notification:** 1 short beep
- **Warning:** 1 long beep

## Requirements

- `sudo` privileges required
- Test scripts available on device at `/tmp/`
- Buzzer is simple on/off (no volume/frequency control)

## Documentation

- **Quick Reference:** `BUZZER-CONTROL.md` - Concise guide with commands and test script references
- **Detailed Guide:** `BUZZER-CONTROL-SIMPLE.md` - Comprehensive documentation
- **Flask API:** `FLASK-BUZZER-CONTROL.md` - Web API implementation

## Testing

Both test scripts have been uploaded to the device and verified working. Scripts test:
- Single beep patterns
- Multiple beep patterns
- Different timing intervals
- Common alert patterns (success, error)

## Status

✅ **Complete** - Test scripts created, uploaded to device, and documentation provided.

## Files

- `test_buzzer.sh` - Bash test script
- `test_buzzer.py` - Python test script
- `BUZZER-CONTROL.md` - Quick reference documentation
- `BUZZER-CONTROL-SIMPLE.md` - Detailed documentation
- `FLASK-BUZZER-CONTROL.md` - Flask API documentation