Hi, I'm new to the forum and I have a problem with my project. I'm using an Analog Devices EVAL-ADXL355Z accelerometer on an Arduino UNO.
The accelerometer is using I2C to communicate with the Arduino UNO.
It looks like it's returing the right values to the serial monitor, but the values that I'm getting back aren't in the right order. If i turn my accelerometer 90 degrees to the left, I get the values from where it was in the first place according to the attachment.
For example: The top is pointing upwards and i'm turning it 90 degrees to the left. Now the top is pointing to the left, but it gives me the values I should have when the top is pointing upwards.
This is my code:
/*
Description: EVAL_ADXL355Z Accelerometer
Revision: V1.3
Rev update: V1.0 November 3, 2020
Rev update: V1.1 November 10, 2020
Rev update: V1.2 November 19, 2020
Rev update: V1.3 November 24, 2020
*/
// include libraries
#include <Wire.h> // Wire library - used for I2C communication
#include <math.h> // Math library - used for math calculations
// ------------------------- Declare Constants ------------------------- //
#define STATUS 0x04 // define STATUS as 0x04
#define XDATA3 0x08 // define XDATA3 as 0x08
#define XDATA2 0x09 // define XDATA2 as 0x09
#define XDATA1 0x0A // define XDATA1 as 0x0A
#define YDATA3 0x0B // define YDATA3 as 0x0B
#define YDATA2 0x0C // define YDATA2 as 0x0C
#define YDATA1 0x0D // define YDATA1 as 0x0D
#define ZDATA3 0x0E // define ZDATA3 as 0x0E
#define ZDATA2 0x0F // define ZDATA2 as 0x0F
#define ZDATA1 0x10 // define ZDATA1 as 0x10
#define RANGE 0x2C // define RANGE as 0x2C
#define POWER_CTL 0x2D // define POWER_CTL as 0x2D, power_register address
#define RANGE_2G 2.048 // define RANGE_2G as decimal 2.048
#define RANGE_4G 4.096 // define RANGE_3G as decimal 4.096
#define RANGE_8G 8.192 // define RANGE_8G as decimal 8.192
// ------------------------- Declare Global Variables ------------------------- //
int ADXL355 = 0x53; // ADXL355 I2C address - 0x53
float x,y,z; // x,y,z initiated as float
float range; // range initiated as float
float rollF,pitchF=0; // rollF,pitchF initiated as float
uint8_t enable(uint8_t); // enable initiated as an unidentified integer
// Setup
void setup()
{
Serial.begin(9600); // Initiate serial communication
Wire.begin(); // Initiate the Wire library
Serial.println("Started"); // Print "Started" on the serial monitor
enable(0x00);
}
// Main loop
void loop()
{
// put your main code here, to run repeatedly:
Serial.println();
Serial.print("Accelerometer ADXL (x,y,z): ");
Serial.print(readX()); Serial.print(",");
Serial.print(readY()); Serial.print(",");
Serial.print(readZ());
Serial.println();
}
float readX() {
Wire.beginTransmission(ADXL355);
Wire.write(XDATA3);
Wire.endTransmission();
Wire.requestFrom((int)ADXL355,3);
uint32_t x1 = Wire.available()?Wire.read():0; // read wire x1 if wire is available
uint32_t x2 = Wire.available()?Wire.read():0; // read wire x2 if wire is available
uint32_t x3 = Wire.available()?Wire.read():0; // read wire x3 if wire is available
uint32_t data = (x1<<16)|(x2<<8)|x3;
data = data>>4;
float value = (float)data;
value = data>0X7FFFF?value-0XFFFFE:value;
return value/0X7FFFF*2.048;
}
float readY() {
Wire.beginTransmission(ADXL355);
Wire.write(YDATA3);
Wire.endTransmission();
Wire.requestFrom((int)ADXL355,3);
uint32_t y1 = Wire.available()?Wire.read():0; // read wire y1 if wire is available
uint32_t y2 = Wire.available()?Wire.read():0; // read wire y2 if wire is available
uint32_t y3 = Wire.available()?Wire.read():0; // read wire y3 if wire is available
uint32_t data = (y1<<16)|(y2<<8)|y3;
data = data>>4;
float value = (float)data;
value = data>0X7FFFF?value-0XFFFFE:value;
return value/0X7FFFF*2.048;
}
float readZ() {
Wire.beginTransmission(ADXL355);
Wire.write(ZDATA3);
Wire.endTransmission();
Wire.requestFrom((int)ADXL355,3);
uint32_t z1 = Wire.available()?Wire.read():0; // read wire z1 if wire is available
uint32_t z2 = Wire.available()?Wire.read():0; // read wire z2 if wire is available
uint32_t z3 = Wire.available()?Wire.read():0; // read wire z3 if wire is available
uint32_t data = (z1<<16)|(z2<<8)|z3;
data = data>>4;
float value = (float)data;
value = data>0X7FFFF?value-0XFFFFE:value;
return value/0X7FFFF*2.048;
}
uint8_t enable(uint8_t c = 0X00) {
Wire.beginTransmission(ADXL355);
if (Wire.endTransmission()==0) {
Wire.beginTransmission(ADXL355);
Wire.write(0X00);
Wire.endTransmission();
Wire.requestFrom((int)ADXL355,1);
if (Wire.available()) {
if (Wire.read()==0XAD) {
Serial.println("Device found");
}
else {
return 1;
}
}
}
else {
return 0;
}
Wire.beginTransmission(ADXL355);
Wire.write(POWER_CTL);
Wire.write(c);
Wire.endTransmission();
range = RANGE_2G;
return 1;
}
uint8_t readData() {
while(dataReady()==0);
uint32_t d3,d2,d1,data;
float value;
Wire.beginTransmission(ADXL355);
Wire.write(XDATA3);
Wire.endTransmission();
Wire.requestFrom(ADXL355,9);
d3 = Wire.available()?Wire.read():0;
d2 = Wire.available()?Wire.read():0;
d1 = Wire.available()?Wire.read():0;
data = (d3<<16)|(d2<<8)|d1;
data = data>>4;
value = (float)data;
value = data>0X7FFFF?value-0XFFFFE:value;
x = value/0X7FFFF*range;
d3 = Wire.available()?Wire.read():0;
d2 = Wire.available()?Wire.read():0;
d1 = Wire.available()?Wire.read():0;
data = (d3<<16)|(d2<<8)|d1;
data = data>>4;
value = (float)data;
value = data>0X7FFFF?value-0XFFFFE:value;
y = value/0X7FFFF*range;
d3 = Wire.available()?Wire.read():0;
d2 = Wire.available()?Wire.read():0;
d1 = Wire.available()?Wire.read():0;
data = (d3<<16)|(d2<<8)|d1;
data = data>>4;
value = (float)data;
value = data>0X7FFFF?value-0XFFFFE:value;
z = value/0X7FFFF*range;
return 0;
}
uint8_t dataReady() {
Wire.beginTransmission(ADXL355);
Wire.write(STATUS);
Wire.endTransmission();
Wire.requestFrom(ADXL355,1);
return Wire.available()?Wire.read()&0X01:0X00;
}
The code works, but I think my calculations aren't right.
The link from the (left) image in the attachment:
I was wondering if anyone knows how to 'fix' this problem or if they know if this isn't a big of a deal that all the values are 'moved' 90 degrees.
Thanks in advance.
