Document the monitor and its limits

Put the evidence beside the code

Your README should identify the board, MicroPython version, sensor module, data pin and resistor/pull-up arrangement. Include the test command and a few actual serial records. Label synthetic replay records so they cannot be mistaken for measurements.

The project gives you a working boundary between device I/O and a testable policy. It does not grant a calibration certificate or demonstrate reliable unattended control. It has no wireless connection and makes no network requests, despite the Pico W's wireless capability.

Extend one layer

An interesting next step is a serial-log viewer on your computer. Parse complete JSON lines, count unknown readings separately and graph only valid measurements. Do not replace missing temperatures with zero: that creates invented cold readings.

A local display is another possible branch. First check the exact display module's supply, I2C voltage and addressing against the Pico and the vendor guide. A display sold in the same store is not automatically electrically compatible without those checks.

Completion check

Explain the difference between GPIO and physical pin numbering, why the LEDs have individual resistors, what a hysteresis band changes, and why a failed read turns off both status outputs. Run the host tests after any policy changes, then show your own device evidence.

Continue free with Python errors and data handling, or the microcontroller and RTOS foundations when you want to investigate scheduling and interrupts. This loop is deliberately simple; it is not an RTOS demonstration.