which is why [mircemk] decided to build a hand-held version using the Arduino Nano and a BMP180 pressure sensor. Since you don’t want to be staring at a little screen in mid-air, the device ...

These devices allow the user to lightly sip or puff into a tube to control switches or sensors ... shelf tubing and fittings, 2 pressure/vacuum switches, and an Arduino. Each one of the switches ...