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Adafruit Feather HUZZAH, based upon the ESP8266. The long and short female headers are soldered to the board, and the AHT20 sensor is wired directly to the VDC and I2C pins.

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Underside of the HUZZAH. The two wires at the top are the VDC and ground for the sensor, the other two wires are the I2C lines. Yellow kaptan tape insulates the solder pads.

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A better view of the underside, right-side up this time.

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Closeup of the AHT20 sensor. Visible are the four wires providing power, ground, and the I2C bus lines. They're soldered through-hole on the other side.

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Solder connections on the AHT20.

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The Adafruit FeatherWing OLED display. At the top and bottom you can see the solder pads for the male headers.

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Display underside, showing the business ends of the header pins.

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Assembled sensor, with the display mounted.

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End-on, showing the micro USB jack which providers power and a serial connection (when plugged into a computer).

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The other end, showing the sensor's connections.

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A deployed sensor, zip tied to the back of a flatpanel television.

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It's not a great picture, I had to take it from a distance.

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The sensor takes measurements every five seconds, and uploads a measurement every sixty seconds to my exocortex.