If I use a square signal generator with 2Hz, it works.
After 3 minutes run:
station
1 = {"state":0,"duration":180,"flow":116.05}
0 = {"state":0,"duration":180,"flow":116.05}
sensor
flow = {"count":342,"volume":342.00}
Measured is less by 3.4% than real ticks, probably that is fine.
