i got trouble when connect a pressure transmitter to Arduino Uno broad analog input, a0, with reading floating from 300 to 900 randomly. The sensor is tested and is normal. For the part of sensor connection, i basically connect the sensor in series with power source, and with -ve wire to A0 analog.input directly, for 4 to 20 mA reading capture in microprocessor.
So, the analog A0 has the self ground or not. Otherwise, how can i modify the.connection. The program was attached for yours comment.
many thanks .
application_pressure_sensor.ino (2.42 KB)