Si7021 Industrial High Precision Humidity Sensor I2C Interface

Description

The main chip is GY-213V-HDC1080(Can use SHT21 HTU21D SI7021 chip to make the same sensor)

This I2C digital humidity sensor is a fairly accurate and intelligent alternative to the much simpler Humidity and Temperature Sensor – SHT15 Breakout It has a typical accuracy of ±4% with an operating range that’s optimized from 10% to 80% RH. Operation outside this range is still possible – just the accuracy might drop a bit. The temperature output has a typical accuracy of ±0.2°C from -20~85°C.

The HDC1080 sensor chip has 2 address-select pins, so you can have up to 4 shared on a single I2C bus. It’s also 3-5V power and logic safe so you don’t need any level shifters or regulators to use with a 5V or 3V microcontroller.

Please note: TI has indicated that there’s a ‘settling’ effect for the humidity and that you will need to re-hydrate the sensor once you receive it. To rehydrate it, place it in a location with 85% humidity for 24 hours or 60% humidity for 10 days.

The HDC1080 is a digital humidity sensor with an integrated temperature sensor that provides excellent measurement accuracy at very low power. The HDC1080 operates over a wide supply range and is a low-cost, low-power alternative to competitive solutions in a wide range of common applications. The humidity and temperature sensors are factory calibrated.