| 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); |
| } |
| |