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’.
Each 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!
8-6-2021 (August 6, 2021) is the Snakiest day of the year and it’s also this year’s CircuitPython Day! The day highlights all things CircuitPython and Python on Hardware. See you there!
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.