/Modules/Sensors/ALTIMET01A/SW/Wiring/MPL115A1/MPL115A1.ino
0,0 → 1,118
/*
MPL115A1 sparkfun breakout baropressure meter
SDN : pin 7
CSN : pin 10
SDI/MOSI : pin 11
SDO/MISO : pin 12
SCK : pin 13
*/
 
// the sensor communicates using SPI, so include the library:
#include <SPI.h>
 
#define PRESH 0x80
#define PRESL 0x82
#define TEMPH 0x84
#define TEMPL 0x86
 
#define A0MSB 0x88
#define A0LSB 0x8A
#define B1MSB 0x8C
#define B1LSB 0x8E
#define B2MSB 0x90
#define B2LSB 0x92
#define C12MSB 0x94
#define C12LSB 0x96
 
#define CONVERT 0x24
 
#define chipSelectPin 10
#define shutDown 7
 
float A0_;
float B1_;
float B2_;
float C12_;
 
void setup() {
Serial.begin(115200);
 
// start the SPI library:
SPI.begin();
 
// initalize the data ready and chip select pins:
pinMode(shutDown, OUTPUT);
digitalWrite(shutDown, HIGH);
pinMode(chipSelectPin, OUTPUT);
digitalWrite(chipSelectPin, HIGH);
delay (10);
// read registers that contain the chip-unique parameters to do the math
unsigned int A0H = readRegister(A0MSB);
unsigned int A0L = readRegister(A0LSB);
A0_ = (A0H << 5) + (A0L >> 3) + (A0L & 0x07) / 8.0;
unsigned int B1H = readRegister(B1MSB);
unsigned int B1L = readRegister(B1LSB);
B1_ = ( ( ( (B1H & 0x1F) * 0x100)+B1L) / 8192.0) - 3 ;
unsigned int B2H = readRegister(B2MSB);
unsigned int B2L = readRegister(B2LSB);
B2_ = ( ( ( (B2H - 0x80) << 8) + B2L) / 16384.0 ) - 2 ;
unsigned int C12H = readRegister(C12MSB);
unsigned int C12L = readRegister(C12LSB);
C12_ = ( ( ( C12H * 0x100 ) + C12L) / 16777216.0 ) ;
}
 
void loop() {
Serial.print("de druk is : ");
Serial.println(baropPessure());
delay(1000);
}
 
//Read registers
unsigned int readRegister(byte thisRegister ) {
unsigned int result = 0; // result to return
digitalWrite(chipSelectPin, LOW);
delay(10);
SPI.transfer(thisRegister);
result = SPI.transfer(0x00);
digitalWrite(chipSelectPin, HIGH);
return(result);
}
 
//read pressure
float baropPessure(){
digitalWrite(chipSelectPin, LOW);
delay(3);
SPI.transfer(0x24);
SPI.transfer(0x00);
digitalWrite(chipSelectPin, HIGH);
delay(3);
digitalWrite(chipSelectPin, LOW);
SPI.transfer(PRESH);
unsigned int presH = SPI.transfer(0x00);
delay(3);
SPI.transfer(PRESL);
unsigned int presL = SPI.transfer(0x00);
delay(3);
SPI.transfer(TEMPH);
unsigned int tempH = SPI.transfer(0x00);
delay(3);
SPI.transfer(TEMPL);
unsigned int tempL = SPI.transfer(0x00);
delay(3);
SPI.transfer(0x00);
delay(3);
digitalWrite(chipSelectPin, HIGH);
 
unsigned long press = ((presH *256) + presL)/64;
unsigned long temp = ((tempH *256) + tempL)/64;
 
float pressure = A0_+(B1_+C12_*temp)*press+B2_*temp;
float preskPa = pressure* (65.0/1023.0)+50.0;
 
return(preskPa);
}