First init.

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2025-10-12 09:13:56 +02:00
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#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");
}
}
}