to make a hydraulic pressure switch calibrator.

Projects Programming
1

I am new in Arduino. I want to make a pressure switch calibrator using Arduino. I made the hardware using Danfoss pressure transmitter MBS 2050. Its working range is from 0 to 250 bars and output is 10% to 90% of its supply which is 4.75 to 8 volts. I want to make a program which display the pressure from the transmitter and display the switching point pressure which is also connected the same hydraulic line. Please anybody help me to make the program.

2

Use a voltage divider (e.g. 2x 10K) to make that 2.375 - 4 Volt so the Arduino analog port can read it.

then you need some code like this.

unsigned long lastTime = 0;

void setup()
{
  Serial.begin(115200);
  Serial.println("pressure v0.1");
}

void loop()
{
  if (millis() - lastTime >= 2000) // every 2 seconds do a measurement
  {
    lastTime += 2000;
    int raw = analogRead(A0);
    float voltage = raw * 5.0 / 1023.0;

    float pressure = voltage * some_constant ; // to be defined - datasheet will help here

    Serial.print(millis());
    Serial.print('\t');
    Serial.println(pressure, 3); // 3 decimals
  }
}
3

Sorry misread, still the code is same assuming 5V operation

the voltage is between 0.5 (10%=0bar) and 4.5 (90%=250bar) volts.

code becomes something like:

unsigned long lastTime = 0;

void setup()
{
  Serial.begin(115200);
  Serial.println("pressure v0.1");
}

void loop()
{
  if (millis() - lastTime >= 2000) // every 2 seconds do a measurement
  {
    lastTime += 2000;
    int raw = analogRead(A0);
    float voltage = raw * 5.0 / 1023.0;

    float pressure = (voltage - 0.5) * 250 / 4.0; // assume linear relation

    Serial.print(millis());
    Serial.print('\t');
    Serial.println(pressure, 3); // 3 decimals
  }
}
4

Thanks for the answers and i am using LCD(16×2) not serial. It should read the pressure and when the pressure switch (which is for calibration) input is ON , display the point of pressure also in second line