This is one component of a system that detects when my dog is near the back door, and notifies me by sending a message to a Solace event broker.
There are two components to the system:
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A proximity sensor connected to a microcontroller, that sends messages to Solace when it detects a presence within 70cm distance.
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An application that receives those messages from Solace and makes a dinging sound in response.
This is the second of the two.
The first is https://github.com/damaru-inc/proximity