need help with IDT flow sensor FS1025

Other Hardware Sensors
1

I am trying to build a flow totalizer using idt fs1025 [Product link](http://need help with IDT flow sensor FS1025)
and an arduino nano.

So far the first problem i encountered was unstable readings, i tried filtering them out using an exponential filter, which gives decent readings. however the sensor gives the flow rate from 0-7 l/min. i need to calculate total liquid that flows through the flow meter.

2

Your link is not working.

So far the first problem i encountered was unstable readings, i tried filtering them out using an exponential filter, which gives decent readings. however the sensor gives the flow rate from 0-7 l/min. i need to calculate total liquid that flows through the flow meter.

I cannot see the code that produces this. Post the code using code tags (the </> button in the editor)!

Conceptually you just have to integrate the flow rate over time.

3

https://www.idt.com/products/sensor-products/flow-sensors/fs1025-liquid-flow-sensor-module

I have tried using the Megunolink exponential filter for smoothing and it works great.

#include "MegunoLink.h"
#include "Filter.h"
 
// Create a new exponential filter with a weight of 5 and an initial value of 0. 
ExponentialFilter<long> ADCFilter(5, 0);
 
void setup() 
{
  Serial.begin(9600);
  Serial.println("Exponential Filter");
  Serial.println("-----------------------");
}
 
void loop() 
{
  int RawValue = analogRead(A7);
  ADCFilter.Filter(RawValue);
 
  TimePlot Plot;
  Plot.SendData("Raw", RawValue);
  Plot.SendData("Filtered", ADCFilter.Current());
 
  delay(100);
}

the first idea that popped was to integrate the data over time, but I'm not quite sure on how to proceed with that on arduino

4

I am curious how you determine unstable readings with a sensor that has 5ms response times?

Paul

5

Hi,
I have similar problem using the sensor.
It seems when the sensor is dry, the Vout is good at 0 volt.
As soon at the sensor is wet (put water in but no flow); the Vout is erratic and has noise ripples

You can try looking at the Vout with a scope.

I contacted IDT suport, it seems they do not have a solution. In my application I did a moving average to suppress the noise ripple. I dont think the sensor is usable in prescision flow measurement.

John

p1.jpg

6

Are you turning on the "heater enable" without liquid flowing?

Paul

7

Have you made any headway on this? I'm trying to figure out the temperature coefficient as the voltage varies greatly at set flow rates for different temperature waters.