‎2022-07-04 07:35 AM
As the datasheet of H3LIS331DL has a 1000 Hz output data rate which means 1 reading every 1 millisecond, and that what is required in my project, I am using an I2C connection and having the period between two readings 3 to 4 milliseconds, the code is as follow :
#include "SparkFun_LIS331.h"
#include <Wire.h>
LIS331 xl;
unsigned long startMillis;
unsigned long currentMillis;
void setup()
{
Wire.begin();
xl.setI2CAddr(0x19); // This MUST be called BEFORE .begin() so
// .begin() can communicate with the chip
xl.begin(LIS331::USE_I2C); // Selects the bus to be used and sets
// the power up bit on the accelerometer.
// Also zeroes out all accelerometer
// registers that are user writable.
xl.axesEnable(true);
xl.setPowerMode(LIS331::NORMAL);
xl.setODR(LIS331::DR_1000HZ);
startMillis = millis(); //initial start time
Serial.begin(115200);
}
void loop()
{
int16_t x, y, z;
currentMillis = millis();
xl.readAxes(x, y, z); // The readAxes() function transfers the
Serial.print(currentMillis - startMillis);Serial.print(",");
Serial.print(xl.convertToG(100,x)); Serial.print(","); // The convertToG() function
Serial.print(xl.convertToG(100,y)); Serial.print(","); // accepts as parameters the
Serial.println(xl.convertToG(100,z)); // Serial.println(", ");// raw value and the current
startMillis = currentMillis;
}
The Output Result:
could you please help me to have 1 reading every 1 milisecond.
Thanks
‎2022-07-04 07:59 AM
The serial port baud rate is a limiting factor. Calculate how many chars/s you can print.
hth
KnarfB
‎2022-07-04 10:14 PM
Thank you for your reply. Could you please tell me how to do it , and is there any way to overcome the baud rate limitation so the sensor output data rate can reach 1 kHz,
I decreased the baud rate, and the interval between two readings increased, but when I increased the baud rate, the interval would stay3 to 4 even when the baud rate on 2000000.