Shower timer

My first ever project based on Micropython code. I wanted to tackle two simple household issues in my bathroom:

• Make sure the (teenage) inhabitants don't shower longer than necessary (save water & energy).
• Boost the Renson Healthbox 3.0 ventilation to extract moisture/steam quicker.

How did I do this

The first issues is easy: install a bathroom timer that buzzes when time is up. The second one is do-able as the Renson ventilation has a local API that can be addressed to boost the ventilation to max.

Hardware needed

• Adafruit Magtag (https://www.adafruit.com/product/4800)
• Lithium Ion Polymer Battery - 3.7v 2500mAh (https://www.adafruit.com/product/328)

Software components (Micropython) used:

• MagTag
• Adafruit requests

Additional info

• Only variables I use are the location of the API (http) and the shower timer
• Upon boot, it shows Start button & battery info, then waits a few seconds (until Start pressed)
• It goes into sleep mode to wake with Timer button showing on the screen.
• It lasts at least 4 weeks on the battery (average usage 3 showers a day)
• The buzzer is an awful sound ;-)
• Every hour it wakes itself up & goes back to sleep to update battery info.
• The background is created by using a shower and battery picture in SVG format and putting it on a BMP using The GIMP.
• The font (Milky Coffee) was downloaded from Dafont (https://www.dafont.com/milky-coffee.font)

To do

• Show battery info in percentage rather than voltage (nice to have, not a must have)

View of the screen