Pixel clock firmware with a message queue

A 32×8 LED matrix clock on the shelf. Make it show the time, then let the house push it messages — a timer from the kitchen, a "bins tonight" reminder — without the messages piling up or the clock disappearing.

Requirements

Render the time with a readable 5×7 font on a 32×8 matrix (a browser simulator of the matrix is in the repo)

Accept messages over MQTT with a priority and a lifetime

Show one message at a time, scrolling if it does not fit, returning to the clock in between

Higher priority pre-empts, equal priority queues, expired messages are dropped

Brightness follows an ambient light reading with a floor so it never goes fully dark

Bonus Points

A Home Assistant discovery payload so the clock appears as a notify target

esp32led-matrixmqtthome-assistant

Beginner

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