 This week's IonMPI is from ST. Ladyida, what is your new product introduction of the week brought to you by Digi-Key? Okay, glad you asked. What is it? It's the ST LPS-28. This is a new barometric pressure and temperature sensor available from ST. It comes in this funky package. It's got this like cool lip on it because it's actually designed so you could put into injection molded case with an O-ring or you can attach a tube to it and have again an O-ring maybe to seal it. The thing that's really cool about the sensor is it is a dual full scale up to 4000 hectopascals absolute digital output and it's water resistant. So this is neat because we've had a couple of water resistant packages that are like okay you just can use them outside and they're not likely to get damaged, especially if you're using it to measure outdoor humidity and like you know without a Teflon coating, these have like a gel coating, their I-squared C they have 24-bit reading but really the thing that's cool about them is that they go to 4000 HPA. They are part of a family, we stock actually quite a few ST barometers, pressure sensors. I think we stock the LPS-22, the 25 and the 33 so you can see some of these but as you can tell pretty much all of them except for the 28 only go up to 1260 HPA which is basically sea level. Sea level is about 1000. One atmosphere is about 1000 hectopascals and so that's what you'll usually see for most sensors from ST, from Bosch, from other vendors, Sincere, etc. So it's interesting about, oh sorry and then here's some of the other sensors, so if you do want to pick some of those up you know we have some of them in stock as well and they're good for altitude sensing so this is what you know a lot of pressure sensors are used for, yes you can use them to kind of detect weather patterns but what they're most commonly used for is you know as you go up a mountain, as you go upstairs or as your drone you know lifts off the ground, the pressure is going to change and you can use this to detect changes in altitude but what a lot of them can't do is go below sea level so one thing that this sensor does which was really nice is it's got you know it's got that MEM sensor in the middle and the ASIC is what does the iSquad C conversion and the metal lid is you know mechanical protection but then it's it's filled with gel and so the gel protects it from water pressure up to 10 atmospheres which would be 10,000 hectopascals and keeps it water resistant so you could actually dunk this under water. Of course you know the rest of the circuitry has to be water protected or sealed but the sensor itself can be exposed to water and it even says you know water can be mixed with some chlorine or detergent or solvents or chemicals to some extent. I think if you have like a you know I wouldn't dunk in gasoline but if it's just water that has some contaminants in it the gel will protect the sensor and allow you to still sense that pressure change and it's important that it can do up to 4,000 hectopascals also known as about four bar because if you want to use a say in a diving watch that can go down to 30 meters or just you know a watch that can survive underwater usage and tell you how far below you're going how far below the surface of the water you are you know it's interesting is you know most sensors I think they are like you know a couple hundred to again a thousand hectopascals and that will actually take you up to like you know most mountain tops but if you go only down 10 meters underwater the pressure doubles at 20 meters it doubles again 30 meters now it's three times sorry four times as much pressure as you would at sea level so you know even though it's like wow four four times the pressure reading that must mean you can go infinitely deep nope 30 meters but that's still I'm very deep and of course you could use this as a sensor to determine if you're making like a UAV that goes underwater or some other underwater robotic cam or something that could be in a high pressure zone this sensor will do the job and of course it's waterproof as well the interface is nice and convenient it's standard i-squared c there's an interrupt data ready pen handy there's an address select pen so you can have two sensors or maybe actually four sensors I think if you connect the SA0 pen to like power ground clock or data I think you could have a couple different i-squared t address seven bit addresses and then it's also not only i-squared c but i3c which we covered a couple shows ago it's you know the new modern i-squared c improvements has a couple things going for it but back compatible with i-squared c so don't worry you can still use it with your 8-bit microcontroller and then you want to integrate this into an android running watch with i3c go for it you're also good to go one nice thing I noticed is the register map is really simple there's a built-in calibration but the calibration is programmed in at the factory so you just once you initialize that you set up you know what FIFOs or whatever you want or how you know how many readings to take before doing any kind of averaging you pretty much just read the pressure out you know as a scale from zero to you know the max value whether you're in high pressure or low pressure mode and that's it there's no math there's no exponentials there's no like logarithmic stuff you got to do it's really easy to get that data out and and calculate it instantly ST has a library if you don't want to write it from scratch check it out it's not you know Arduino but it could probably be easily ported to whatever platform you're using of course it's going to work great with you know ST's IDE and tools but it's on github so check it out I you know I really am enjoying that Silicon vendors are now releasing published open source code for their drivers for their sensors it's it's a big step up from you know even like a decade ago when you were really on your own you read the datasheet and good luck but having it not under NDA being open sourcing available is awesome so check that out there's also an aval board which I can show on the overhead real fast if you want to get started quickly did she has the aval board in stock and it's basically just a simple breakout yeah well and then here it is there's some we like to do these when you can actually buy them yes so this sensor is actually available you can purchase it so it's not part of the chip shortage it's part of NPI you wouldn't do that to you now so this is let me see this is the sensor in the middle there says there's a simple breakout I think this will plugs into some of their dev boards but you've just got the iSquad C pins labeled out here in the interrupt ground power and just a capacitor it's all you need and you can see it's a quite small sensor it's designed for watches and wearables but of course it can be used for anything that needs high pressure waterproof sensing okay and that's on NPI