0

June 5, 2015 AT 2:00 pm

Handheld Humidity Measuring with Astro-Pi #piday #raspberrypi @Raspberry_Pi

NewImage

Via Easily Distracted.

The main theme of our winning entry for the Astro-Pi completion was detecting the ‘sweaty astronaut’ using the HAT’s humidity sensor.

To test how this might work, and to build a simple demonstration for the CodeClub team, we wrote some Python to use the Astro-Pi’s awesome LED matrix to display the latest readings from the humidity sensor.

Adding a battery pack turns this into a useful hand-held humidity sensor (you could easily use it as a thermometer instead with a minor code change).

The code changes the colour of the displayed numbers based on the previous reading. If the humidity has increased then the digits are green, if it has decreased, they’re red, and (you guessed it) orange if there has been no change.

Of course the screen only displays two digits so when it gets really hot and steamy…

The code also logs the humidity out to a file, so you can plot humidity against time. Here is 24 hours in our house. The big spike near the start was due to another ‘breath test’.

NewImage

Read more.


998Each Friday is PiDay here at Adafruit! Be sure to check out our posts, tutorials and new Raspberry Pi related products. Adafruit has the largest and best selection of Raspberry Pi accessories and all the code & tutorials to get you up and running in no time!


Check out all the Circuit Playground Episodes! Our new kid’s show and subscribe!

Have an amazing project to share? Join the SHOW-AND-TELL every Wednesday night at 7:30pm ET on Google+ Hangouts.

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

Learn resistor values with Mho’s Resistance or get the best electronics calculator for engineers “Circuit Playground”Adafruit’s Apps!


Maker Business — Steve Ballmer Serves Up a Fascinating Data Trove

Wearables — Chalk it up

Electronics — Look to ferrites (no, not ferrets, the European polecat) when faced with high frequency

Biohacking — A Run in the Altra IQ Smart Shoes

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.