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 pullup resistors for I2C communications. If you’re hooking up multiple I2C devices on the same bus, you may want to disable these resistors.
- 0.6″ x 0.6″
- Schematic
- Eagle Files
- Datasheet (Si7021-A20)
- Hookup Guide
- GitHub (Design Files & Example Code)
- GitHub (Library)
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Note: Orders with more than one product are assigned a specific processing period dependent on the particular item.
Before shipping, we will examine the items ordered carefully before shipping. The majority of orders are shipped within 48 hours. The time to deliver varies from 3-7 days.
Returns
The stock is constantly changing and cannot be fully controlled by us due to the involvement of many parties including the factory and our warehouse. This means that the actual stock could alter at any time. Be aware that it is possible that your order could be out of stock after you have made the order.
Our policy lasts thirty days. If you haven't received your item within 30 days, we're unable to offer the option of a refund or exchange.
You are able to return an item when it's unopened and is in the same condition as when you first received it. It should also be returned in its original packaging.
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