The object presents its capabilities to the user from its placement next to the locked door. The user can then realize the purpose of the card reader and slide any card through the machine. The affordance the object presents is having the slit that fits a card. It resembles everyday objects like credit card swipes.
The first thing the user knows to do is try and insert their card in an attempt to get the door unlocked. The feedback that the machine can give are with the three lights, a red, yellow, and green. In its resting locked state, it displays yellow. When the user slides their card, it either turns green notifying access granted or red which is access denied.
The benefits of this machine is providing security to the building. Anyone that does not have a Wellesley one-card cannot enter the building. The problem I often encounter is the direction the card strip should face. I often mistaken it and have to try again. Perhaps an image of a card with the strip could be placed on the machine. Then the direction will be known to the user.
The machine needs 12 V and travels 80mA so it draws .96 Watts of power. This power requirements makes me quite happy. The amount is low but it makes sense because the machine only needs power to shine a light and let the door unlock. https://www.securityinformed.com/software-house-rm2l-pi-technical-details.html?utm_source=SSc%20International%20Edition&utm_medium=Redirect&utm_campaign=US%20Redirect%20Popup%20Cookie#more-info.
Great product to choose and very well done summary of its interfaces.