# Tutorial: Reading Water Flow rate with Water Flow Sensor

Pre-project discussion, teammates recruitment, project publishment and proposal.

### Re: Tutorial: Reading Water Flow rate with Water Flow Sensor

What distance can you send the signal from the flowmeter? How do you determine this? If the yellow signal wire to the seeeduino is 50 yards, would it still read properly on pin 2?
Pre-kindergarten

Posts: 1
Joined: Fri Jul 31, 2015 11:55 am

### Re: Tutorial: Reading Water Flow rate with Water Flow Sensor

Hello,
I have a flow meter and have everything wired up to an arduino uno. the signal is coming in at digital port 4. my problem is that when i power the arduino and upload the code, without having the pump on i get values like 520, 512 etc. I am testing the system with a small fish tank pump and when i turn it on, i now get values like 240, 304, 248 etc.

Three questions,
1)why am i getting 520 when there is no water flowing through the meter? I would expect this to be zero not a value like 520
2)Why do values vary so much on every sample? i can see 224, 280, 356, 404, 232,288 etc when the pump is just pumping the same amount more or less.
3)In the sample code the equation is

Calc = (NbTopsFan * 60 / 4.5); // (Pulse frequency x 60) / 4.5Q, = flow rate in L/hour

but in the comments above, it seems that the 4.5 suppose to be 7.5. Which one is correct?

Thanks
Pre-kindergarten

Posts: 5
Joined: Wed Jun 04, 2014 5:50 pm

### Re: Tutorial: Reading Water Flow rate with Water Flow Sensor

I'm trying to interface the sensor with Arm7.
Can you tell me what pin2 corresponds to so that i can interface it with ARM7.
Pre-kindergarten

Posts: 1
Joined: Sat Mar 05, 2016 12:24 pm

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