Hello I need help I am very new in this and I am needing to connect and read the values of a pressure transducer (https://www.festo.com/cat/en-gb_gb/data/doc_ENGB/PDF/EN/SPTW_EN.PDF) .
It operates from 8 to 30 V and returns analog values from 0 to 10v, so I have a question: if the arduino analog pins go from 0 to 5v, do I need a voltage divider? if so, the same should connect on the analog pin only to lower the output voltage of the sensor, right?
On the other hand, is it OK to feed the sensor with 12 v?
Yes on voltage divider. Feed the sensor to the top of the two resistors, connect the Arduino to the junction of the two resistors. Upside is that you need a 50% reduction which means both resistors are the same value. Any value such that you do not exceed the output current rating of the sensor or the wattage of the resistors.
If it is spec'ed to work 8-30, then running 12V should be fine.
martin_ferrari:
It operates from 8 to 30 V and returns analog values from 0 to 10v
The one that operates on 8 to 30 V outputs a 4-20mA signal (part suffix "A"), not a 0 to 10 V signal. If you have that part, then you would not use a resistor divider. You'd use this (see post #4).
The one that outputs 0 to 10 V operates on 14 to 30 V (suffix "VD"). If you have that one, then you could use a resistor divider.
Which one do you have?
OK, so is correct this diagram?
No. See link in reply #2.