Contact Admin. Sip-and-puff or sip 'n' puff SNP is assistive technology used to send signals to a device using air pressure by "sipping" inhaling or "puffing" exhaling on a straw, tube or "wand. It is commonly used to control a motorized wheelchair by quadriplegics with very high injury to their spinal cord or people with ALS. Devices that use SNP technology require specific amounts of air pressure to be "sipped" or "puffed" by the user.
Note that the words "hard" and "soft" are relative to the user and depend on their breathing abilities. Once this calibration process is complete, the SNP device will only recognize the user specific sips and puffs that have been saved into the SNP device. Typical applications of Sip-and-Puff devices are for control of a motorized wheelchair.
Control typically consists of four different inputs from the user. An initial hard puff will enable the wheelchair to move forward, while a hard sip will stop the wheelchair. Conversely, an initial hard sip will enable the wheelchair to move backward, while a hard puff will stop the wheelchair. A continuous soft sip or soft puff will enable the wheelchair to move left or right respectively depending on how long the user blows into the tube, straw or "wand".
The mouth-controlled input provide users a simple and effective way to control mouse movement. Movement and operation of this joystick is similar to that of a mouth stick. Mouse button clicking is accomplished with the help of sips or puffs function of the joystick. A sip-and-puff input device combined with computer accessibility software means many keyboard -accessible programs can be used with this device.
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