Smart-building IoT projects

This started as a way of seeing temperature and humidity around a house. It grew into a private building view where each room can show its sensor readings, history, device state, and—where it makes sense—controls.

ESP32-C3 devices publish structured messages through AWS IoT. Small serverless services validate and store the readings, while a React dashboard puts them back onto the two floors of the house. The same path carries configuration in the other direction.

• Each physical device has its own identity and certificate.
• Readings keep their device, room, timestamp, and units attached.
• The interface distinguishes a requested change from one the device has actually applied.

The first version paired an ESP32-C3 with an SHTC3 for temperature and humidity. I later added an SCD40 CO₂ sensor on the same I²C bus and carried the new reading through the firmware, device metadata, cloud services, history charts, and room view.

The deployed device reports temperature, humidity, and CO₂ using the point names and units expected by the rest of the platform. The board is still deliberately homemade: protoboard, short wiring runs, and a printed enclosure that can be opened again.

I measured the assembled board before drawing the enclosure, then printed and adjusted the shell until the sensor openings, lid, and USB-C access all worked with the hardware that was actually on the bench.

A separate ESP32-C3 acts as a Bluetooth bridge for a Terma MOA Blue electric radiator. I used a small probe program to work out how the real controls behaved, then turned that into a bridge between cloud configuration and the radiator’s BLE characteristics.

Requested temperatures are range-checked, written to the radiator, read back, and then reported to the platform. The web interface waits for that device response before it calls a change applied. One radiator has been tested through that complete path; adding another is still future work.

The sensor, cloud, dashboard, and first radiator-control paths have all been used on the real system. I’m still changing the hardware packaging and the operational side of it, so this page is a record of where the project is now rather than a finished-product claim.