Sip and Puff (SNP) devices are one example of Assistive Technology that allow one to interact with things by applying negative or positive pressure to a straw or tube in their mouth. This is done by either sipping on the tube, like a straw, or puffing into it, like when you blow bubbles in your milk until your parental unit (or partner) makes you stop.
Here, we show how with the right sensors, microcontrollers, and software, it can be relatively easy to make a very basic but expandable Sip and Puff device. It is a fun, easy project that you can use to learn a bit more about them and how they might be used.
The heart of this project is a STMicroelectronics (ST) LPS33HW MEMS pressure sensor mounted to an Adafruit breakout board with built in STEMMA QT connectors and support circuitry. Importantly the LPS33HW has a metal port on top like a hat and a groove for fitting an o-ring. With 24-bit pressure data output, an absolute pressure range of 260-1260 hPa ( hectopascals ), and the ability to work in absolute or relative modes, this sensor is the perfect tool for the job.
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Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.