In this particular case, it’s a DIY USB polygraph-like machine by [Juangg] using an Arduino and sensors on ... complete with 3D printed enclosure and sensor elements. The polygraph may have ...

[Jens]’ device consists of an Arduino ... By carefully calibrating a TGS822 sensor, [Jens] was able to measure the acetone content of an exhaled breath along with temperature and pressure.

Gas sensor made from nanoflakes of indium oxide-based materials successfully identifies individuals with lung cancer ...