This Si7021 I2C humidity and temperature sensor is now discontinued. We suggest the LM35 Temperature Sensor for Arduino as a great replacement. The Si7021 is a top - notch monolithic CMOS IC. It combines humidity and temperature sensor elements, an analog - to - digital converter, signal processing, calibration data, and an I2C interface. Using industry - standard, low - K polymeric dielectrics for humidity sensing, it offers low - power operation, low drift and hysteresis, and long - term stability. Factory - calibrated, the sensors' calibration data is stored on - chip, making them fully interchangeable without recalibration or software changes. Available in a 3x3 mm DFN package and reflow solderable, it can upgrade existing 3x3 mm DFN - 6 RH/temperature sensors with wider - range precision and lower power consumption. An optional factory - installed cover protects the sensor during assembly and product life, excluding liquids and particulates. Ideal for measuring humidity, dew - point, and temperature in various applications like HVAC/R, asset tracking, industrial, and consumer platforms. Applications include HVAC/R, thermostats/humidistats, indoor weather stations, and automotive climate control. Specifications: Operating Voltage 1.9 - 3.6V (3.3V recommended), Standby Current 60nA, Temperature Range - 40 - 85°C (- 10 - 60°C recommended), Temperature Accuracy ±0.4°C (- 10 - 85°C), Humidity Range 0 - 100%RH (20% - 80%RH recommended), Humidity Accuracy ±3%RH (0 - 80%RH), Temperature Conversion Time 7ms, Humidity Conversion Time 17ms, Interface I2C, Gadgeteer and soldering pad with 2.5mm spacing, Size 32X32mm, Mounting hole inner diameter 3.2mm, spacing 25mm. Documents include Wiki Doc, Datasheet, and Schematic. Shipping list: Si7021 Temperature and Humidity Sensor x1, Gadgeteer IDC10 Cable x1.
Using the Si7021 Temperature and Humidity Sensor is easy. First, connect it to your Arduino following the I2C interface instructions. Make sure to use the recommended 3.3V operating voltage for best performance. When using it, keep the temperature in the range of - 10 - 60°C and humidity between 20% - 80%RH as much as possible. This will help get the most accurate readings. The sensor comes with a Gadgeteer IDC10 Cable which you can use for connection. For assembly, if you have the optional cover, it can protect the sensor from damage during the process. But remember, it doesn't protect against liquids and particulates. As for maintenance, there's not much to do. Just keep it clean and dry. If you want to check the detailed information, refer to the Wiki Doc, Datasheet, and Schematic provided. Also, since this sensor is now discontinued, you might want to consider the LM35 as a replacement if you face any issues.
