M3200 Pressure Transducer Arduino

The M3200 pressure transducer from the Microfused line of TE is suitable for measurement of liquid or gas pressure, even for difficult media such as contaminated water, steam, and mildly corrosive fluids. 

M3200 - Pressure Transducer

Specifications:

• Analog Outputs (V/mA)
• 14-Bit Digital Output for Pressure and 11-Bit for Temperature
• CE Compliance
• Weatherproof
• 0.5% zero offset, 1.5% accuracy (Total error band)

• (1)Arduino Nano
• (1)M3200 - Pressure Transducer
• (2) 4.7 kOhms Resistor
• Breadboard

Construct the circuit.

#include <Wire.h>


int M3200address = 0x28;   // 0x28, 0x36 or 0x46, depending on the sensor.
float maxPressure =100;  // pressure in PSI for this sensor, 100, 250, 500, ... 10k.
byte status;


unsigned long pressureMillis = 0;
const int pressureTiming = 500; // 500ms every data acquisition


void setup (){
Serial.begin(9600);
Serial.println("M3200 initializing");
Wire.begin();
}


void loop(){
if (millis()-pressureMillis >= pressureTiming){
  pressureMillis = millis();
Wire.requestFrom(M3200address,4);   // request 4 bytes
int n = Wire.available();
  if( n == 4){
    status = 0;
    uint16_t rawP;     // pressure data from sensor
    uint16_t rawT;     // temperature data from sensor
    rawP = (uint16_t) Wire.read();    // upper 8 bits
    rawP <<= 8;
    rawP |= (uint16_t) Wire.read();    // lower 8 bits
    rawT = (uint16_t)  Wire.read();    // upper 8 bits
    rawT <<= 8;
    rawT |= (uint16_t) Wire.read();   // lower 8 bits


    status = rawP >> 14;   // The status is 0, 1, 2 or 3
    rawP &= 0x3FFF;   // keep 14 bits, remove status bits


    rawT >>= 5;     // the lowest 5 bits are not used
  
 // The math could be done with integers, but I choose float for now
    float pressure = ((rawP - 1000.0) / (15000.0 - 1000.0)) * maxPressure;
    float temperature = ((rawT - 512.0) / (1075.0 - 512.0)) * 55.0;


    Serial.print("Status = ");
    Serial.println(status);
    Serial.print( "Pressure = ");
    Serial.println( pressure);
    Serial.print( "Temperature = ");
    Serial.println( temperature);
    Serial.println("-------------------------------------");


  }else{
    Serial.println( "M3200 Pressure Transducer not Detected");
  }
}


}

Open and check the serial monitor.