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Witty Fox - SI7021 Humidity Temperature Sensor Breakout Board

Witty Fox - SI7021 Humidity Temperature Sensor Breakout Board

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  • The sensor can detect the surrounding environment of the humidity and temperature
  • It is High reliability and excellent long-term stability
  • These sensors have a precise relative humidity sensor {± 3% RH (max), 0–80% RH}
  • This sensor has an industrial Grade High Accuracy Temperature Sensor {±0.4 °C (max), –10 to 85 °C}
  • These sensors are compatible with Arduino, Raspberry Pi, NodeMCU, and other microcontrollers

Witty Fox - SI7021 Humidity Temperature Sensor Breakout Board

Witty Fox Si7021 humidity temperature sensor offers better accuracy and a wider range for temperature and humidity readings, as compared to DHT11 and DHT22. It also comes in a significantly smaller r size as compared to the former 2 sensors. The Si7021 has ±0.4 °C temperature accuracy at a range of -10 to +85 °C± and 3% relative humidity measurements with a range of 0–80% RH. This sensor is perfect for environmental monitoring projects and uses the I2C interface for data transfer which makes it compatible with the majority of available microcontrollers.

The Si7021 temperature and humidity sensor offer an accurate, low-power, factory-calibrated digital solution ideal for measuring humidity, dew-point, and temperature, in applications ranging from HVAC/R and asset tracking to industrial and consumer platforms. e. It can be used as hardware and software-compatible drop-in upgrades for existing RH/ temperature sensors.

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Video Tutorial of Witty Fox - SI7021 Sensor:

Wireless Data logging humidity-temperature readings with Witty Fox Si7021 & ESP32


  • HVAC/R 
  • Thermostats/humidistats 
  • Respiratory therapy
  • Indoor weather stations
  • Micro-environments/data centers
  • Automotive climate control and defogging
  • Asset and goods tracking
  • Mobile phones and tablets

Package Includes:

  • 1 x Witty Fox Si7021 Sensors


Humidity Sensor ± 3% RH (max), 0–80% RH
Temperature Sensor ±0.4 °C (max), –10 to 85 °C
Operating Range  0 to 100% RH
Operating Voltage  1.9 to 3.6 V
Dimensions  3 x 2 x 1cms
Weight  5 grams

Shipping & Returns

  • All orders confirmed before 3 pm IST are shipped on the
    same day, barring rare pickup delays on holidays or disturbances
  • Delivery time in Metro cities is 1-3 days, Others it is
    3-7 days. It varies based on location, reliant on courier services
  • Return window: 7 days from receipt unless stated
    otherwise. No refunds/replacements after
  • Returns only for non-working/damaged products are accepted
  • Initiate return requests to our customer service team via Support ticket or contact us at +91-8123057137
  • Refunds are processed within 3-4 working days post inspection and approval.

For more details, please check our Shipping and Return Policy

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1. What is SI7021 Humidity Temperature Sensor?

  • The SI7021 I2C Humidity and Temperature Sensor is a monolithic CMOS IC that integrates humidity and temperature sensing elements, an A/D converter, signal processing, calibration data, and an I2C interface. The  use of patented, industry-standard, low-k polymer dielectrics for moisture sensing  enables the construction of  monolithic CMOS sensor ICs with low power consumption, drift and hysteresis, and excellent long-term stability. increase. The humidity and temperature sensors are factory calibrated and  calibration data is stored in  on-chip non-volatile memory. This allows the sensor to be completely replaced without the need for recalibration or software changes.

2. How to use a SI7021 Humidity Temperature Sensor?

  • The Si7021 is a low-cost, easy-to-use, highly accurate digital temperature and humidity sensor. It only requires two wires for I2C communication and can also take relative humidity readings and accurate temperature readings. This sensor is ideal for environmental sensing and data collection, ideal for  weather stations and humidor control systems. The Si7021 also features a hydrophobic PTFE filter that covers the sensor inlet. This filter blocks contaminants but allows water vapor to pass, protecting the sensor  from water damage and providing accurate sensor readings.