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These Temperature/Humidity sensors are some of the finest & highest-accuracy devices available. These have have a true I2C interface for easy reading. The SHT30-D sensor has an excellent ±2% relative humidity and ±0.3°C accuracy for most uses. Vin - this is the power pin. The chip can use 2.5-5VDC for power. To power the board, give it the same power as the logic level of your microcontroller - e.g. for a 5V micro like Arduino, use 5V. For a 3.3V controller like a Raspbery Pi, connect to 3.3V GND - common ground for power and logic