-1a- how you connect the ADC to the raspberry? - Using I2C connection with the help of I2C sheild
-1b- did you get it running,
work on range 0..4 V
testing with some voltage signal in that range?
whats your code - I am using this code and I didn't test it out with the range of 0 to 4 V
-2- the 2 wire 4 ..20mA sensor
how you want connect it? - I wanted to connect it with 4-20mA temperature sensor with I2C based current loop receiver
what resistor you used?-
with the official 250ohm it would be (0) 1 .. 5 V signal. - Not using any resistor, directly connected current loop receiver with raspberry Pi I2C sheild and configuring the mentioned code
what power supply you used?
should be 12 .. 24VDC - 24VDC
but I am not able to understand why its showing 2.5V every time while running the code