Using ESPHome and an ESP32 to build a custom smart home sensor with no code required. The whole thing can be built for less than $10, using the 3-pack of ESP32's below, plus the cheaper SHTC3. Links for stuff I mentioned: Home Assistant: ESPHome: Parts + Alternatives ESP32C6 (3-pack - € each): ESP32C6 (single - €6): Adafruit SHTC3: DFRobot SHTC3 (Cheaper): Pimoroni Jumper cables and mini breadboards: Adafruit BME280 (the one with a pressure sensor):