Hello, I would like to connect a pressure sensor (0-50kPa) which has 0-3.3V output on analog input port.. I'am using Arduino UNO board.
I'am confused with A/D converter..
I have found that is possible to set up arduino to use 3.3V as reference voltage so the digital value of 3.3V is 1024?
Or If I use default "setup" the analog value of 5V is 1024 so 3.3V is about 689..
what is right aproach?
in my case 0V represent 0 Kpa and 3.3V represent 50kPa..
Can someone help me to convert "digital" value into pressure? (function is: Vout = VS (P x 0.018 + 0.04) ), VS = 3.3 V
for example: digital value of 689 = 50Kpa and digital value of 0 is 0 Kpa...