reading 4 to 20mA pressure transducer

Hi,

Please guide me, how i can interface a 4-20mA pressure transducer with my microcontroller(LPC2478-ARM7),
how i can read its output current, so that i can display the present pressure over a display.
Thank you

The simplest way is to pass the 4-20mA through a 150 ohm resistor,
to create a voltage between 0.6 and 3.0 volts.

Use the ADC built into the LPC2478 to read the voltage as a 10bit value.

Thank you ExperimenterUK for the reply,
Should i direct place 150 ohm resistor between Transducer signal wire and ADC channel or there would be any other biasing circuitary?
Please elaborate with some example circuitary to do this.
Thanks in advance.

You need to connect resistor in shunt to measure voltage across it.

There would be no any biasing circuit?
only a shunt resistor will do the work

There would be no any biasing circuit?
only a shunt resistor will do the work

diana1234

Just connect the sense resistor between the transducer output and ground.
Add a small (say 1 uF) capacitor in parallel with the resistor
to give a bit of smoothing.
You can calibrate in software or by adding a variable resistor.

If the sense resistor becomes disconnected you will get a high voltage
at the transducer output, make sure your connections are good !
This circuit has smoothing, voltage protection and is adjustable.

Thank you sir
I make a try with the transducer and let you know.