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Fart Thermometer

To fart or not to fart?

What is the Fart Detector?

The Fart Thermometer is a Raspberry Pi- powered machine that detects the amplitude of farts that are given off by nearby surroundings. Detection is not limited by farts, burps and belches will also give off a signal resulting in a reading on the Fart Thermometer. In order to maximise readings it is highly recommended to stand up while farting as coverage over the backside would decrease the amount of gas particles released- resulting in a weaker fart reading.

How does it work? It’s too good to be true.

Humans can detect farts easily, as we are sensitive to the volatile sulphuric compounds which make up 1% of flatulence (i.e. the compounds which make farts smell). To detect a fart with the Raspberry Pi, however, is a slightly different proposition: we need to give the Raspberry Pi a ‘nose’, by connecting it to a sensor which is responsive to one of the gasses present in flatulence. The sensor recommended for this project is the Figaro TGS2600, which is sensitive to the hydrogen, another gas contained in flatulence. When air enters the sensor, it is energised by a small heater which allows its electrical resistance to be measured. This is done by passing a low level of electricity across a small gap of energised air. The more contaminated the air is, the less resistance it has and the better it will conduct electricity (like a variable resistor). The output of the sensor is therefore an analogue voltage that goes up and down according to how contaminated the air is. The more contaminants, the higher the voltage output.

Find out more about the potential of the Fart Thermometer here:

https://www.raspberrypi.org/learning/fart-detector/worksheet/

 

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