Using an IR sensor and a Raspberry Pi 4 it is possible to track up to 10 mailboxes at the same time, when a letter arrives it sends an SMS.
rocconeto/Message-sender-with-Raspberry-and-IR-sensor
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Using an IR sensor and a Raspberry Pi 4 it is possible to track up to 10 mailboxes at the same time, when a letter arrives it sends an SMS.