Hello... I am working on one project of water pressure measurement, in which i used pressure transducer which gives me output between 4-20mA Current form. I am using one 250 ohm resistance to convert current into voltage, and than i give this voltage to ADC of arduino UNO channel 0 (A0). ADC reading is continuously fluctuating up to 10 decimal numbers. I have also check by connecting multi-meter and measure sensor current reading, for particular pressure. but current reading is stable (even not fluctuate 1 or 2 points.) also i have checked voltage value after 250 Ohms +Ve and ground. converted voltage is also showing very stable. but why ADC reading is fluctuating..? i am using arduino uno, i doesn't have any changes in AREF, AVCC etc... please suggest effective solution, Thank in advance.