I would like to use my Raspberry Pi to monitor my fermentation temperature. I would like a thermometer I can attach to the side of the carboy and wire up to the Raspberry from a few feet away.

For bonus points, I would like to place multiple sensors on the carboy.

Any suggestions?

  • 1
    Nice idea. A quick Google reveals a few thermostats/thermometers that work fine with the Raspberry Pi, but there are also several questions on here that offer solutions already.
    – Jivings
    Dec 29, 2013 at 8:56
  • Okay, but all of these sensors seem to measure the air temperature, or are submersible in liquid. I'm looking for something that I can attach/glue to the outside of a carboy to measure the temperature of the glass. Dec 29, 2013 at 17:05

4 Answers 4


Get the thermal sensor @Jivings suggested and some thermal grease . http://www.raspberrypi-spy.co.uk/2013/03/raspberry-pi-1-wire-digital-thermometer-sensor/ + http://www.ebay.com/sch/i.html?_nkw=thermal+paste

Attach the sensor to the carboy with some thermal grease, to ensure good thermal conductivity, and glue/tape it to keep it in place.

You can even hook multiple up easily by running single wires for GND and 3.3v around the carboy.

  • These DS18B20[+ = lead free] temperature sensors are a good choice. They are quite cheap, deliver the data in digital format, and using multiple of them on the same wire and averaging the values will give a pretty precise reading.
    – Daniel F
    Dec 30, 2013 at 19:21

Adafruit sells a waterproof temperature sensor that would work. They also have a related tutorial.


I use a TEMPer USB Thermometer with my Pi, they are less than $10. I guess you could use as many as you want with a hub and attach them with a thermal epoxy.

Search for 'temper pi' for more info.


This might just be useful, check it out: http://brewpi.com/


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