I’m collecting data from two 6DoF IMUs using the ESP32 IoT Redboard and a Qwiic I2C MUX (ports 0 & 1).
I can view the data in the serial monitor but I’m not able to log it to the on-board SD card. I was previously able to create a file and write “Hello World” to it, so I know the card is formatted correctly and the problem is with my code, which I developed by resourcing a datalogging example and combining it with what I already having working.
#include <Wire.h>
#include "SparkFun_ISM330DHCX.h"
#include "FS.h"
#include "SD.h"
#include "SPI.h"
SparkFun_ISM330DHCX myISM;
#define NUMBER_OF_SENSORS 2
// For Datalogging to SD Card
const int chipSelect = 5;
// Structs for X,Y,Z data
sfe_ism_data_t accelData;
sfe_ism_data_t gyroData;
void setup()
{
Serial.begin(115200);
Serial.println("Qwiic Mux Shield Read Example - Trevor's Edit v08");
// Datalogger Setup
Serial.print("Initializing SD card...");
// see if the card is present and can be initialized:
if (!SD.begin(chipSelect)) {
Serial.println("Card failed, or not present");
// don't do anything more:
while (1);
}
Serial.println("card initialized.");
Wire.begin();
//Initialize all the sensors
for (byte x = 0 ; x < NUMBER_OF_SENSORS ; x++)
{
enableMuxPort(x); //Tell mux to connect to port X
if (!myISM.begin()) {
Serial.println("Did not begin.");
while (1)
;
}
// Reset the device to default settings. This if helpful is you're doing multiple
// uploads testing different settings.
myISM.deviceReset();
// Wait for it to finish reseting
while (!myISM.getDeviceReset()) {
delay(1);
}
Serial.println("Reset.");
Serial.println("Applying settings.");
delay(100);
myISM.setDeviceConfig();
myISM.setBlockDataUpdate();
// Set the output data rate and precision of the accelerometer
myISM.setAccelDataRate(ISM_XL_ODR_416Hz);
myISM.setAccelFullScale(ISM_2g);
// Set the output data rate and precision of the gyroscope
myISM.setGyroDataRate(ISM_GY_ODR_416Hz);
myISM.setGyroFullScale(ISM_125dps);
// Turn on the accelerometer's filter and apply settings.
myISM.setAccelFilterLP2();
myISM.setAccelSlopeFilter(ISM_LP_ODR_DIV_100);
// Turn on the gyroscope's filter and apply settings.
myISM.setGyroFilterLP1();
myISM.setGyroLP1Bandwidth(ISM_XTREME);
disableMuxPort(x);
}
Serial.println("Mux Shield online");
}
void loop()
{
// make a string for assembling the data to log:
String dataString = "";
// read sensors and append to the string:
for (byte x = 0 ; x < NUMBER_OF_SENSORS ; x++)
{
int sensor = analogRead(x);
dataString += String(sensor);
if (x < 2) {
dataString += ",";
}
char fileName[] = "datalogger.txt";
// open the file. note that only one file can be open at a time,
// so you have to close this one before opening another.
File dataFile = SD.open("datalogger.txt", FILE_WRITE);
// if the file is available, write to it:
if (dataFile) {
dataFile.println(dataString);
dataFile.close();
// print to the serial port too:
Serial.println(dataString);
}
// if the file isn't open, pop up an error:
else {
Serial.println("error opening datalogger.txt");
}
enableMuxPort(x); //Tell mux to connect to this port, and this port only
if (myISM.checkStatus()) {
myISM.getAccel(&accelData);
myISM.getGyro(&gyroData);
Serial.print(x);
Serial.print(" ");
Serial.print("Accelerometer: ");
Serial.print("X: ");
Serial.print(accelData.xData);
Serial.print(" ");
Serial.print("Y: ");
Serial.print(accelData.yData);
Serial.print(" ");
Serial.print("Z: ");
Serial.print(accelData.zData);
Serial.println(" ");
Serial.print(x);
Serial.print(" ");
Serial.print("Gyroscope: ");
Serial.print("X: ");
Serial.print(gyroData.xData);
Serial.print(" ");
Serial.print("Y: ");
Serial.print(gyroData.yData);
Serial.print(" ");
Serial.print("Z: ");
Serial.print(gyroData.zData);
Serial.println(" ");
}
disableMuxPort(x); //Tell mux to disconnect from this port
}
delay(1000); //Wait for next reading
}
Running this sketch, I get the attached output in the Serial Monitor which leads me to believe I have the order of the code jumbled up.
I’m new to programming and have attempted to solve this on my own for 3 days with no success.
