Doorbell

A virtual doorbell that allows people without a card to access the space easily, by alerting people already in the space using audio, visual and push notifications.

Current goals

 * Allow people who don't have a card to access the space
 * Make it easy and streamline the process for both the person waiting and the person coming to open the door
 * Have a proper layout, documentation, and functionality

Component

 * Raspberry Pi with network connection
 * Warning light
 * Speakers
 * Push button