A Letter Detection Method for Mailbox Based on Infrared Diffuse Reflection

Introduction Mailboxes are essential facilities for receiving mail, typically used for receiving untracked ordinary letters. However, because it requires manual confirmation of whether mail has been deposited into the mailbox, it not only necessitates regular mailbox checks but also fails to ensure timely mail reception. This paper proposes a simple method for detecting letters inside mailboxes based on infrared diffuse reflection, aiming to transform existing mailboxes into “Internet of Things”(IoT) mailboxes with mail detection and reporting capabilities. The mailbox is mainly divided into four parts: the box body, power supply, sensor, and communication. Among them, the box body is the...

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