Affordable precision pluviometer PART 1 (introduction and construction) is here.
Here are first analog measurements of the affordable precision pluviometer:
The measurement setup was: measuring graduated cylinder (4) strain gauge sensor (3) from kitchen scale, power suuply (2) and digital multimeter (1):
The measured output voltage vs. volume (water mass) was:
and the sensitivity was pretty consistent:
Next step: add some ADC with PGA for digital measurements. I will try to measure the sensitivity vs. temperature, but from my experience I am not expecting very high error due to temperature changes.
Another important information is the maximum volume before automatic drain: 785mL.
Some additional photos of today experiment: