Hello, I am new in this forum.
I have recently bought a MS5611 barometer, with the board configuration shown in the pictures.
I have tried everything for reading the I2C registers of it, but when using the I2C scanner, it doesn’t find any device.
I also tried a bit with the SPI, but I dont know exactly how to do it.
So, what I’d like to know is:
-My sensor board seems to be slightly different to the one shown in the wire diagram at drotek.fr. I attach two pictures of how it looks like. I don’t knowif I should do somethig special with it, or what is the rol of the CS pin (I have tried both, connecting it to ground and 3.3V, but it seems it never selects the I2C mode).
-I am connecting to MEGA 2560.
-I have seen other people with the same problem solved it after playing with the pull up resistor or soldering something on the board, but since my board is different, I don’t know what to do.
Thank you so much for your help.
I am using the following code:
#include <Wire.h>
#define ADDRESS 0x77 //0x76
uint32_t D1 = 0;
uint32_t D2 = 0;
int64_t dT = 0;
int32_t TEMP = 0;
int64_t OFF = 0;
int64_t SENS = 0;
int32_t P = 0;
uint16_t C[7];
float Temperature;
float Pressure;
void setup() {
// Disable internal pullups, 10Kohms are on the breakout
PORTC |= (1 << 4);
PORTC |= (1 << 5);
Wire.begin();
Serial.begin(9600); //9600 changed 'cos of timing?
delay(100);
initial(ADDRESS);
}
void loop()
{
D1 = getVal(ADDRESS, 0x48); // Pressure raw
D2 = getVal(ADDRESS, 0x58);// Temperature raw
dT = D2 - ((uint32_t)C[5] << 8);
OFF = ((int64_t)C[2] << 16) + ((dT * C[4]) >> 7);
SENS = ((int32_t)C[1] << 15) + ((dT * C[3]) >> 8);
TEMP = (int64_t)dT * (int64_t)C[6] / 8388608 + 2000;
Temperature = (float)TEMP / 100;
P = ((int64_t)D1 * SENS / 2097152 - OFF) / 32768;
Pressure = (float)P / 100;
Serial.print(" Actual TEMP= ");
Serial.print(Temperature);
Serial.print(" Actual PRESSURE= ");
Serial.print(Pressure);
Serial.println();
Serial.print(" RAW Temp D2= ");
Serial.print(D2);
Serial.print(" RAW Pressure D1= ");
Serial.println(D1);
Serial.println();
// Serial.print(" dT= ");
// Serial.println(dT); can't print int64_t size values
Serial.println();
Serial.print(" C1 = ");
Serial.println(C[1]);
Serial.print(" C2 = ");
Serial.println(C[2]);
Serial.print(" C3 = ");
Serial.println(C[3]);
Serial.print(" C4 = ");
Serial.println(C[4]);
Serial.print(" C5 = ");
Serial.println(C[5]);
Serial.print(" C6 = ");
Serial.println(C[6]);
// Serial.print(" C7 = ");
// Serial.println(C[7]);
Serial.println();
delay(1000);
}
long getVal(int address, byte code)
{
unsigned long ret = 0;
Wire.beginTransmission(address);
Wire.write(code);
Wire.endTransmission();
delay(10);
// start read sequence
Wire.beginTransmission(address);
Wire.write((byte) 0x00);
Wire.endTransmission();
Wire.beginTransmission(address);
Wire.requestFrom(address, (int)3);
if (Wire.available() >= 3)
{
ret = Wire.read() * (unsigned long)65536 + Wire.read() * (unsigned long)256 + Wire.read();
}
else {
ret = -1;
}
Wire.endTransmission();
return ret;
}
void initial(uint8_t address)
{
Serial.println();
Serial.println("PROM COEFFICIENTS ivan");
Wire.beginTransmission(address);
Wire.write(0x1E); // reset
Wire.endTransmission();
delay(10);
for (int i=0; i<6 ; i++) {
Wire.beginTransmission(address);
Wire.write(0xA2 + (i * 2));
Wire.endTransmission();
Wire.beginTransmission(address);
Wire.requestFrom(address, (uint8_t) 6);
delay(1);
if(Wire.available())
{
C* = Wire.read() << 8 | Wire.read();
}
else {
Serial.println("Error reading PROM 1"); // error reading the PROM or communicating with the device
}
Serial.println(C*);
}
Serial.println();
}
