OpenSprinkler › Forums › Hardware Questions › OpenSprinkler › 3 wire Flow Sensor › Reply To: 3 wire Flow Sensor
I am finally getting around to installing my water meter. Going through the maths and firmware for determining the best divider to use from my sensor, I have hit a bit of an issue. In this thread @Ray states the maximum rate of pulse accepted is 200 pulses/sec, however, looking through the firmware the debounce period seems to be 50ms which would only allow 20 pulses/sec?
The only practical issue I can imagine is that this sensor can send very high frequency pulses which may exceed the maximum frequency the firmware accepts (200 pulses per second).
ulong curr = millis(); if(curr-os.flowcount_time_ms < 50) return; // debounce threshold: 50ms flow_count++; os.flowcount_time_ms = curr;
For my application this isn’t a huge issue since my flow meter far exceeds the max rate so will need a divider anyway. If I divide by 270 rather than 27 I should end up with a single pulse per liter giving a maximum rate of 2 pulses/sec at full flow of 120 l/min. Or perhaps divide by 135 to give max of 4 pulses/dec.