This is a rough guide to making a suck/puff switch operate standard switch equipment.

Suck/puff switches (also known as low pressure/vacuum or sip/puff switches) can be obtained from www.rswww.com for around £22 each with 1m of PVC tube (code 317-443). You attach a tube to the front or the back of the switch (in the middle), to give control via either sip to activate, or puff to activate. They are in effect, simple on/off switches, and require no external power.

If you're an absolute beginner, we strongly recommend that you follow "The Basic Soldering Guide" - by Alan Winstanley.

To see suck/puff switches in action, see Mark BB's Nintendo 64 and Playstation controllers.


Technical:

"Pneumatic switches which are vented both sides of a diaphragm and can thus be used in either pressure, vacuum or differential modes. The single pole contacts remain in the normally open position until the operational differential pressure is reached. As the contact pressure is dependent on the air pressure, the switch rating will be reduced when used at the minimum operating pressures."

1. What you will need: 

1x low pressure/vacuum switch (with PVC connecting tube - supplied)
1x 3.5mm mono plug
1x Mounting system to bring to chin

Soldering iron (15 to 30 Watt power); thin solder; soldering flux; desoldering braid; speaker wire (2 wires).

Knife or wire strippers. Tools to make mounting system.

2. Wire and test:

Connect your speaker wire from the 3.5mm plug to the suck/puff switch.

Connect an appropriate length of PVC tube to the switch and test.

3. Mount and tidy.

Find a way to position the switch near to the person's mouth safely. Try to keep your wiring as tidy as possible.

Image pictured is of Mark Bosanquet-Bryant's suck/puff Playstation controller.

D.I.Y. Text PUBLIC DOMAIN 2003 - www.OneSwitch.org.uk