winkj:
Hi Rushan,I wrote Arduino drivers for Sensirion flow sensors, which should support the LD20 sensor: GitHub - winkj/arduino-sflow: Unoffical arduino driver for Sensirion flow sensors.
Note that if you're using a 5V Arduino, you may have to use a logic level shifter (e.g. https://www.sparkfun.com/products/12009) as the LD20 is spec'ed at 3.3..3.7V only.
Thank You very much brother. Have you worked with these LD20 sensors? Which are other options of low flow sensors? I was searching from where to buy in UK, so if you could tell e from where can i buy and price?