This smart mailbox sensor prototype was contract work for a client. I was approached to work on a connected mailbox notifier that would inform the user not only when mailbox is opened, but whether mail was added or taken away. I determined feasibility by researching possible sensors. Once a sensor was identified, I designed the electronics and developed the firmware for the first prototype using Particle development boards. I also designed the mobile app and the backend using OpenHAB. The logo, image, and video below are copyright of George Gruber.