Proximity Sensor for Dog Leash

I'm seeking a skilled engineer to develop a proximity sensor for a dog leash and harness connection.

Key Features:
- **Type**: Proximity sensor
- **Usage**: To sense the connection between a dog leash and harness
- **Features**:
- Wireless connectivity
- Weather resistance (for outdoor use)
- Safe around dogs (non-intrusive, sturdy)

Ideal freelancers should have prior experience in creating sensors with wireless capabilities and knowledge in developing pet-safe devices. A strong understanding of weather-resistant materials and technology is also vital for this project.

The proximity sensor should have a short detection range of 0 to 30cm.

The sensor should use a rechargeable battery. The sensor should provide an audible alarm and preferably a smartphone alarm when the dog leash and harness connection is detected or broken.

The sensor should utilize Bluetooth for wireless communication. The sensor is primarily for safety monitoring purposes, ensuring that pet owners are alerted if the leash connection is broken. The sensor should have a battery life thats longer the better.

The sensor should provide smartphone and audio alarm when the dog leash and harness connection is detected or broken. The sensor should have a battery life of a couple weeks or months. The sensor should be a small attachment that can be easily added to the leash.