Unicorn - An ESP8266 thermometer and humidity meter

by Thorinair, published

Unicorn - An ESP8266 thermometer and humidity meter by Thorinair Feb 18, 2018
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Unicorn is an ESP8266 based high precision wireless thermometer and humidity meter. To achieve high accuracy, the sensor used is the SHT21. Once measured, the device uploads the data to variables hosted on VariPass. The whole device is designed to run off a single 18650 Li-Ion battery, and can potentially keep running for a month thanks to ESP's deep sleep functionality (Not yet tested however!).


  • Measures temperature and humidity using an SHT21 sensor.
  • Measures battery status as percentage or voltage.
  • Can connect to up to 8 different WiFi networks and switch between them.
  • Uploads data to VariPass.
  • A status LED indicates the success of the upload process when enabled.
  • Runs off a single 18650 Li-Ion battery.
  • Supports ESP's deep sleep feature for prolonged battery life.
  • Lots of configuration available in the software.
  • Features a slot on the back which fits an M5 countersunk screw, used for hanging on a wall.
  • USB port is exposed for charging and programming.
  • Case designed in such a way to minimize heat transfer.
  • A small hole on the back used to reset the board using a paper clip.

Required Hardware

Required Software
Unicorn runs software written by myself, It is available on my GitHub.

Printing & Assembly
Print everything without any supports and exactly as already oriented for best results.

Assembly is pretty straight forward and with the correct hardware, everything snaps into place. Picture 3 shows the general layout and assembly of all the printed parts and hardware. Four M3*16 screws hold the upper parts in place, and four hold the lower. One M3*10 screw along with an inserted nut into the Unicorn_Sensor.stl holds the side cover.

You will need to do a lot of soldering to wire everything up. Please check pictures 4, 5 and 6 on this upload and pay attention to the cable colors.

As always, I am providing the .blend file as well in case you wish to modify this.

Print Settings


Nightmare Rarity






0.2 mm



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