1. Doors access with keys
2. Doors access with remote sensors
3. Doors access with bio metrics
4. Doors access with credits
Doors access with keys: Most of the houses have the keys to access. Doors acts as a security for a house and owners keep the keys to open it.
Doors access with remote sensors: In the recent days some houses are built with technology. Even doors fixed to a house also uses the remote sensors to open and close automatically.
Doors access with bio metrics: Bio metrics is a method to identify a person. Bio metric kind of access will be used by business organizations. As there are many people accessing the business doors will be automatically operated with Identification cards. Most of the ID cards may have bio metrics.
Doors access with credits: Some doors may need to use credits to access them, the best example of such kind are public places train station and bus stations.