Zigbee Rain Gauge

I wanted a rain gauge to plug into my Home Assistant for use with an irrigation system and found this guide: https://community.home-assistant.io/t/diy-zigbee-rain-gauge/255379/25

I didn't want to wait for the gauge body being delivered so I remixed the following to fit a Sonoff SNZB-04 door contact sensor: https://www.thingiverse.com/thing:2849562

This model replaces 32RainBase.stl.

To modify the SNZB-04

Remove circuit board from the case
Make holes in the case for the wires to pass through
Unsolder the reed switch
Solder wire between reed switch and the pads the reed switch was originally attached to. Remember to pass the wires through the case before you finish the soldering

Calibrate the gauge:

Use a pipette to fill the tipper making sure to note how many milliliters it takes to tip.
Repeat 10 times
Calculate the average by adding up all of your readings and dividing by 10 (mine was 9.5ml)
Calculate the area of the funnel opening.
Put the figures into thi