EYE ON NPI – ICP-10111 Barometric Pressure Sensor #EYEonNPI #DigiKey @DigiKey @InvenSense @Adafruit

This week’s EYE ON NPI (video) can handle the pressure of being featured – it’s the ICP-10111 Barometric Pressure Sensor with astonishing accuracy that makes it excellent to use as an altimeter.

According to TDK, this “pressure sensor can measure pressure differences with an accuracy of ±1 Pa, an accuracy enabling altitude measurement differentials as small as 8.5 cm, less than the height of a single stair step.” 1 Pa is really good and competitive in the market.

Even though we call this an altimeter, its technically a pressure sensor that uses the changes in pressure over altitude to compute. Earth’s ambient barometric pressure changes with altitude – because air gets thinner the higher you go. There’s a simple calculation that can be used to determine relative altitude changes and, if you know the sea level pressure (which usually doesn’t vary much) you can use that to determine the absolute altitude. The better and more accurate your pressure readings, the better your altitude calculation output.

GPS can also be used to calculate absolute altitude, by measuring timing differences from 3 or 4 orbiting satellites. However, GPS only has an accuracy of about 10 meters, which is good for large equipment like planes but not good for humans, who are only about 2 meters tall. Also, of course, you need to have GPS fix, which consumes a lot of power and requires one to be outdoors. Often times, even if a system does have GPS, a pressure-sensing altimeter will be included in the system. Also, pressure sensors can of course be used underground or underwater – try getting a GPS fix there!

This isn’t a new kind of sensor – we’ve stocked a wide range of barometric sensors over the years such as the popular BMPxxx and the DPS310. But this one seems to have improved the precision, with an impressive 1 Pascal at around sea level instead of the common 2 or 3 Pascals. This apparently can give you ~10 cm differential measurements. Note that this is differential, not absolute – you can tell if you’ve gone up or down and by how much, but it doesn’t necessarily translate to precision absolute measurements (which is a different specification).

One nice improvement over most sensors we’ve seen is that these come in four packaging options: physical size/pinout variations in 2x2mm and 2×2.5mm and then waterproofed to 1.5m depth versions with three micro-laser-drilled holes in the top. Obviously the PCB that the sensor attaches to may not be easily waterproofed, but this sensor could have a gasket covering it, or it could just be less sensitive to ingress moisture and dust.

Another big deal is…all four ICP-10111 versions in stock at Digi-Key! Right now most of the other sensors we like to use are totally unavailable due to parts shortages, but you can get some of these sensors and they seem to be I2C-usage pin-compatible with the BMP280/DPS310 and BME390. Note the SPI pins are NC/reserved, so its not purely pin-compatible, and of course there’s some firmware updates you’ll need to code up. So if you need a altimeter, and want one with waterproof casing, these could be an easy swap into an existing design to upgrade it! Order today an you could have them in hand by tomorrow morning.

See at Digi-Key at https://www.digikey.com/short/r248d9n8

Adafruit publishes a wide range of writing and video content, including interviews and reporting on the maker market and the wider technology world. Our standards page is intended as a guide to best practices that Adafruit uses, as well as an outline of the ethical standards Adafruit aspires to. While Adafruit is not an independent journalistic institution, Adafruit strives to be a fair, informative, and positive voice within the community – check it out here: adafruit.com/editorialstandards

Join Adafruit on Mastodon

Adafruit is on Mastodon, join in! adafruit.com/mastodon

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.

Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Join over 36,000+ makers on Adafruit’s Discord channels and be part of the community! http://adafru.it/discord

CircuitPython – The easiest way to program microcontrollers – CircuitPython.org

Maker Business — “Packaging” chips in the US

Wearables — Enclosures help fight body humidity in costumes

Electronics — Transformers: More than meets the eye!

Python for Microcontrollers — Python on Microcontrollers Newsletter: Silicon Labs introduces CircuitPython support, and more! #CircuitPython #Python #micropython @ThePSF @Raspberry_Pi

Adafruit IoT Monthly — Guardian Robot, Weather-wise Umbrella Stand, and more!

Microsoft MakeCode — MakeCode Thank You!

EYE on NPI — Maxim’s Himalaya uSLIC Step-Down Power Module #EyeOnNPI @maximintegrated @digikey

New Products – Adafruit Industries – Makers, hackers, artists, designers and engineers! — #NewProds 7/19/23 Feat. Adafruit Matrix Portal S3 CircuitPython Powered Internet Display!

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !

No Comments

No comments yet.

Sorry, the comment form is closed at this time.