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Thermodo adds a thermometer to your smartphone


March 8, 2013

The Thermodo is a plug-in thermometer for use with mobile devices

The Thermodo is a plug-in thermometer for use with mobile devices

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Today’s sensor-packed smartphones can measure a lot of things, but ambient temperature generally isn’t one of them. It is possible to buy separate Bluetooth temperature-sensing modules, and it’s been suggested that mobile devices could use beams of infrared light to obtain spot temperature readings. The Thermodo, though, is considerably more straightforward – it’s a tiny electrical thermometer that plugs into the phone’s headphone port.

Here’s how it works ...

The Thermodo itself is based on a standard four-pole audio plug, but it also contains a passive temperature sensor. An audio signal is sent through that sensor – depending on the temperature surrounding the phone, the sensor will attenuate the signal amplitude differently. The phone’s microphone picks up the altered signal, and relays that data to the accompanying app. The result is a real-time onscreen display of the temperature.

The device draws its power from the phone, and reportedly uses less juice than a pair of headphones. When not needed, it can be plugged into a matched keychain carrier.

One of the Thermodo’s limiting factors is the range of temperatures it can measure: -20 to 50ºC (-5 to 120ºF). The designers are quick to point out that the stated operating range of the iPhone 5 is 0 to 35°C (32 to 95° F), but that still may limit its usefulness for some applications.

Copenhagen-based start-up Robocat is currently raising production funds for the Thermodo on Kickstarter, and has already far exceeded its funding goal – apparently a lot of people want a thermometer for their smartphone. A pledge of US$25 will get you one.

More information is available in the pitch video below.

Source: Thermodo

About the Author
Ben Coxworth An experienced freelance writer, videographer and television producer, Ben's interest in all forms of innovation is particularly fanatical when it comes to human-powered transportation, film-making gear, environmentally-friendly technologies and anything that's designed to go underwater. He lives in Edmonton, Alberta, where he spends a lot of time going over the handlebars of his mountain bike, hanging out in off-leash parks, and wishing the Pacific Ocean wasn't so far away. All articles by Ben Coxworth

The idea is awesome, but if it's dependent on the microphone...then it might not work in a noisy setting. Just a slight negative.

Roma Khudoleyev

@Roma; it uses the microphone part of the jack, not the microphone built into the phone (unless by noisy you mean electrically noisy).

All in all a clever piece of kit, and i find myself wondering if the same approach could be used for other measurements.


I like this one. To bad the $10 level is closed :(

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