By counting the pulses from the output of the sensor, we can easily calculate the water flow rate (in litre/hour – L/hr) using a suitable conversion formula. The Arduino Sketch (code) uses the ...

A sensor measures flow for the Arduino, which adjusts a control valve actuator to maintain the specified setpoint. The software uses proportional and integral control (the PI part of a PID loop).

In this particular case, it’s a DIY USB polygraph-like machine by [Juangg] using an Arduino and sensors on ... complete with 3D printed enclosure and sensor elements. The polygraph may have ...