Yep, that’s a lot of ST pressure sensors! Each one has slightly different precision: like many companies making sensors, ST has gotten better and better at making sensors, with each new model getting better accuracy/precision.
The LPS28 is a big step up in capabilities – almost all baro/pressure sensors are good up to 1060hPA which is basically sea level pressure (naturally 1013hPA) or in a high pressure weather system.
The moment you want to go underwater, the ambient pressure increases rapidly by 1 Bar (equal to “1 Atmosphere” or 1000hPa) for every 10 meters. That is to say, 10 meters down you’ll be at 2000hPa, and at 30 meters, 4000hPa! But, like we said – most pressure sensors folks use cannot be used at such low pressures – which is why this sensor is the diggity – not only does it have a waterproof gel but you can actually use it underwater!
The interface for this sensor is also nice and easy: I2C or I3C with one address pin and one alert/interrupt pin. The sensors are calibrated in the ST factory and thankfully are loaded into the ASIC on boot, so you can just read the pressure directly from the I2C register address without doing any funky math.
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.
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