Rainfall meter / Rain gauge

thingiverse

Yet another rainfall meter. Its sensitivity/resolution is approximately 1.25ml / 0.173mm/m2 per pulse, utilizing five-by-five-by-two magnets. Besides printed parts, you'll need: * Two five-by-five-by-two N38 magnets at minimum * Four M3x16 screws * Two M3x20 screws * One M3x35 screw * Four 3x16 or 3x20 wood screws with triangle heads * A unipolar Hall sensor and its PCB for it (everything on the PCB except the hall sensor is optional) * C1 & C2 - two 1206, 100uF, 16V capacitors * IC2 - a DS18B20, note that its pinout is reversed on the PCB The surface area of this meter is approximately 7238mm2, so its multiplier is about 138.15. In my case, the bucket tips when filled with around 1.25ml, but you should calibrate it and obtain specific values for your print: run any known quantity of water through the meter, divide it by the number of pulses generated, multiply it by 138, and there you have it - the amount of water per m2 per pulse.