Hello, I am using ss302 pressure sensor that gives 0-10V output based on its pressure. The thing is I am getting 10V when I have not applied pressure to it. So my question is that it works reversely or I am getting wrong values.
P.S. I donot have anything to apply pressure at this time.
I appreciate your suggestions.
Regards,
Does it have any markings other than ss302?
Has this been given to you for a student project? If so ask for the full model number or a link to the datasheet.
No its not a student project. The datasheet is
Workaholic:
No its not a student project. The datasheet is
http://www.sendo-sensor.com/pro1/19_109.html
http://www.pressuresensorsuppliers.com/uploads/file/20180124/SS302+.Q12.19.C03.pdf
Look at the ordering information on page 4. Which sensor do you have?
I have seen it. It is SS302+PS02A01B01
Does it have any physical adjustment potentiometers for 'span and zero' adjustment?
If not, contact the manufacturer and ask for the adjustment procedure.
If the sensor is new it may just need adjusting. If it's old it may be broken.
Thanks. Yes It needs some adjustment. Now it works from 0-10V with 0-400bar. However, the microcontroller reads 0.2V using adc so its gives 8 bar. Well, no problem, I will use 0.2 as offset.
Workaholic:
However, the microcontroller reads 0.2V...
The A/D returns an A/D value, not a voltage.
Changing a value into voltage is what you do when you make a voltmeter.
You should subtract an offset value from the returned A/D value.
And then multiply it with a factor to display pressure.
'Voltage' should nowhere be used.
Leo..
If 0.2V = 8 bar then >220 bar == broken Arduino.
It seems you forgot to place a voltage divider on the sensor output - 9:1 ratio or thereabouts would be good, bringing the voltage output to 0-1V, and use the internal reference for better stability of your readings.