Many people experience anxiety about whether they locked their front door after leaving home. This uncertainty can lead to unnecessary stress, wasted time returning to check, or even security risks if the door was accidentally left unlocked. While smart lock systems exist, they often require expensive home automation setups or are overcomplicated for users who simply want confirmation their door is secure.

A Simple Solution Within Reach

One approach could involve creating a basic digital key or key attachment that communicates with the door lock to indicate its status. This might work by:

• Using a small battery-powered device attached to (or replacing) the traditional key with simple indicator lights (green for locked, red for unlocked)
• Alternatively developing a separate fob or smartphone app that pairs with a small lock sensor using short-range wireless technology like Bluetooth

The system could automatically notify users about the lock status when they leave, without requiring internet connectivity or complex installation. This solution would be particularly useful for renters, forgetful individuals, and those who need extra reassurance about home security.

Making It Work With Existing Systems

The design could prioritize compatibility with common door locks while keeping costs low. Initial versions might focus on:

• A basic key fob that lights up to indicate lock status
• A universal sensor that clips onto existing deadbolts without modifications
• Simple alerts through lights or vibrations rather than complex smartphone integrations

More advanced versions could later add features like remote notifications or activity logs, but would maintain the core value proposition of being a straightforward, affordable solution.

Standing Apart From Smart Locks

Unlike full smart lock systems that require professional installation and internet connectivity, this solution would focus solely on addressing the specific pain point of lock-status confirmation. It would complement rather than compete with existing smart home products by being:

• More affordable than systems like August or Yale locks
• Simpler to use, with no app required for basic functionality
• Easier to install, making it renter-friendly

The key advantage would be solving one common problem exceptionally well, rather than trying to be a comprehensive smart home solution.