SparkFun
SparkFun Humidity and Temperature Sensor Breakout - Si7021
A low-cost, highly accurate digital humidity and temperature sensor breakout board based on the Silicon Labs Si7021. Communicates over I²C with just two data...
A low-cost, highly accurate digital humidity and temperature sensor breakout board based on the Silicon Labs Si7021. Communicates over I²C with just two data lines, providing relative humidity and precise temperature readings for environmental monitoring projects.
The breakout includes built-in 4.7 kΩ pull-up resistors for I²C. If connecting multiple I²C devices on the same bus, you may want to disable these resistors to avoid conflicts.
Specifications
- Sensor – Silicon Labs Si7021
- Measurements – Relative humidity and temperature
- Interface – I²C
- Pull-Up Resistors – 4.7 kΩ (built-in, can be disabled)
- Connections – VCC, GND, SDA, SCL
- Board Dimensions – 15 × 15 mm (0.6″ × 0.6″)
Key Features
- High Accuracy – Precise humidity and temperature readings
- Simple I²C Interface – Only 4 pins to connect (VCC, GND, SDA, SCL)
- Built-In Pull-Ups – Ready to use out of the box
- Low Power – Ideal for battery-powered and data-logging applications
Ideal For
- Weather stations
- Environmental data logging
- Humidor and climate control systems
- IoT sensor networks
Package Contents
- 1× SparkFun Si7021 Humidity and Temperature Sensor Breakout
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- breakout
- A breakout is a small circuit board that makes a tiny or hard-to-solder component easier to connect to with standard pins. It matters because this OLED module can be wired into a microcontroller project without needing to solder directly to the display’s fine contacts.
- IoT
- Short for Internet of Things, meaning physical devices that connect to networks or the internet to send data or be controlled remotely. It matters if you want projects such as connected sensors, remote controls or classroom data-logging activities.
- UPS
- An uninterruptible power supply is a battery-backed power system that keeps a device running when external power is unplugged or fails. For an embedded computer, it helps prevent sudden shutdowns that can corrupt files or interrupt a project.
Find this product in
Brands
Si7021 Breakout Schematic
Schematic · 82.0 KB · Click any page to view full size
Si7021-A20 Sensor Datasheet
Datasheet · 1.6 MB · Click any page to view full size
Si7021 Sensor Datasheet
Datasheet · 353.1 KB · Click any page to view full size
Supplier page — sparkfun.com
Supplier Description · 639.5 KB · Click any page to view full size
Resources & Downloads
Guides, code examples, and more
Related Tutorials
Free guides on learn.littlebird.com.au
