Here’s a project using the Adafruit Si7021 Temperature & Humidity Sensor Breakout Board. It utilizes a Raspberry Pi Zero and Pimoroni Display-o-Tron for the readout. Here’s more from Dr H via instructables:
[This project] allows to measure temperature and humidity using the relatively precise Si7021 sensor. In combination with a Pi Zero and a power bank you can build a small mobile device.
With some minor adaptions this example may also be helpful to construct other measuring devices using ic2 sensors. E.g. a cheap mobile photometer for field research, or a device to measure colors precisely. And, as it is i2c, you may use multiple different sensors in parallel.
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