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Ideal for environmental sensing and data logging and perfect for build a weather stations or humidor control system; built-in 4.7KΩ pullup resistors for I2C communications. SEN-13763
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14 days for return
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Description
The Si7021 is a low-cost, easy-to-use, highly accurate, digital humidity and temperature sensor. This sensor is ideal for environmental sensing and data logging and perfect for build a weather stations or humidor control system. All you need are two lines for I2C communication, and you’ll have relative humidity readings and very accurate temperature readings as a bonus!
There are only four pins that need to be hooked up in order to start using this sensor in a project. One for VCC, one for GND, and two data lines for I2C communication. This breakout board has built-in 4.7KΩ pull up resistors for I2C communications. If you’re hooking up multiple I2C devices on the same bus, you may want to disable/enable the pull-up resistors for one or more boards. On the Si7021, the pull-ups are enabled by default. To disable them, simply use some solder wick to remove the solder on the jumper labeled PU. This will disconnect the resistors from VCC and from the I2C bus.
The Si7021 also comes equipped with a hydrophobic PTFE filter covering the inlet on the sensor. This filter blocks contaminants but allows water vapor to pass through, keeping your sensor safe from water damage while still proving accurate sensor readings.
The tiny white cover on the IC is known as a Polytetrafluorethylene (PTFE) Membrane Filter. It keeps moisture out but allows humidity in. This filter is very low-profile, hydrophobic and oleophobic, and excludes particulates down to 0.35 microns in size.
Features
- Uses the I2C interface
- Typical humidity accuracy of ±2%
- Typical temperature accuracy of ±0.3C
- Operates from 0 to 100% humidity but this sensor isn’t recommended for harsh environments where it could come in contact with water (such as rain)
- 3.3V sensor - use inline logic level converters or 10kΩ resistors to limit 5V signals
- Only one Si7021 sensor can reside on the I2C bus at a time
- Dimensions: 0.6" x 0.6"
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Other products in the same category (16)
Adafruit module with Si7021 temperature and humidity sensor. Sensor Sillicon Labs can measure temperature in the range of -10 ~ 125 ° C, and humidity in the range of 0-100 & RH. The sensor communicates using the I2C interface. Adafruit 3251
Module with a temperature and humidity sensor based on the SHT40 system. Equipped with a STEMMA QT connector, it communicates via the I2C interface. Adafruit 4885
Module with DHT20 sensor. It allows you to measure humidity in the range from 0 to 100% and temperature from -40 to 80 ℃. Seeed Studio 101020932
Module with a digital temperature and humidity sensor based on the SHT35. Communication via the I2C interface. DFRobot SEN0333
Module with a temperature and humidity sensor based on the SHT40 system. It communicates via the I2C interface. SEN0428
The AM2315C is an advanced packaged temperature and humidity sensor offering easy integration with microcontrollers thanks to its 2.5V-5.5V power supply and standard I2C interface, providing greater resistance to external conditions than typical SHT sensors, with measurement accuracy of ±2% RH and ±0.3°C
Module with a digital temperature and humidity sensor based on the SHT31-F system. Communication via the I2C interface. DFRobot SEN0332
Module with BME680 sensor to measure the concentration of volatile organic compounds, pressure, temperature and humidity. It communicates via the I2C interface. Pimoroni PIM357
Module with a temperature and humidity sensor DHT22. It allows you to measure humidity in the range from 0 to 100% and temperature from -40 to 80℃. DFRobot SEN0137
Module with pressure, temperature and humidity sensor BME280. It allows to read the atmospheric pressure in the range from 300 to 1100 hPa and communicates via the I2C interface. Pimoroni PIM472
Module with a steam sensor. It can be supplied with the voltage of 3.3 V or 5 V. It has an analog output. DFRobot SEN0121
A module with a temperature and humidity sensor based on the AHT20 system. Equipped with a Gravity connector, it communicates via the I2C interface. DFRobot SEN0528
Wireless sensor with LoRaWAN network communication. Dedicated to industrial long-distance data acquisition with a wide measurement range of temperature from -40°C to 85°C and humidity from 0 to 100% RH. Seeed Studio 114992867
Module with a temperature and humidity sensor based on the SHT31-D system. Equipped with a STEMMA QT connector, it communicates via the I2C interface. Adafruit 2857