Tutorial: Reading Water Flow rate with Water Flow Sensor

[alina06]

brakke562 post_id=5967 time=1298036200 user_id=3016:

@brakke562 post_id=5967 time=1298036200 user_id=3016

[b]eltoddo:[/b] Yes, it will be off 1.5cl in the worst case. If, and only if, the accuracy is constant for a certain device, it can be configured. Lets say you have constant -1% error in measured vs. real value, (aka. 50cl measured, 50.5cl real) you pull 1.01 as multiplier into the code. In +1%, you use 0.99 as multiplier. (Yes, it is a bit wrong, but I'm just making it simple enough.) Experiment and change the multiplier value to compensate. If the error was constant, that is.

[b]Nashblackcat:[/b] If the sensor works with 1 to [URL=https://vidmate.vet/]Vidmate[/URL] [URL=https://downloader.vip/itunes/]iTunes[/URL] [URL=https://notepad.software/]Notepad++[/URL]
30 liters per minute(LPM) range, 50cl is gained with 6LPM in 5 seconds. Take that as 10cl in 1 sec, and if going down to 2LPM speed, it is ~3.33cl in one sec. Hard to say what the safe margin is, but I would NOT try filling 4cl vodka shot. 8cl maybe.

[b]LeeLinkoff:[/b] In the formula NbTopsFan * 60 / 7.5 , the NbTopsFan is the amount of rising pulse edges detected by the controller in a set delay time. Here it was 1 second. So we have here our pulses per second and the *60 multiplies this value by 60, so we get pulses per minute. The 7.5 is a constant set in the datasheet of the sensor that tells us the relation between flowrate and pulses per minute the sensor is sending. I would add here a correction value *0.97 to *1.03 if the measurement error is constant to a certain device.

[b]nikoumouk:[/b] I agree, the comment and code is wrong and real output is in LPM. Add *60 or change original *60 to *3600 to get liters per hour.

This is very interesting! Thanks for posting. I have a question around a practical example I’m thinking about putting together around this. I see the the “accurate within 3%” note and I get a bit nervous…