I'm using the standard SD.h library and the Datalogger example runs fine, but when I attempt to make my own datalogger using a ToF sensor (MTOF17001) (which is giving the correct data in its example code) it can't open the file.
SD Example:
/*
SD card datalogger
This example shows how to log data from three analog sensors
to an SD card using the SD library.
The circuit:
* analog sensors on analog ins 0, 1, and 2
* SD card attached to SPI bus as follows:
** MOSI - pin 11
** MISO - pin 12
** CLK - pin 13
** CS - pin 4 (for MKRZero SD: SDCARD_SS_PIN)
created 24 Nov 2010
modified 9 Apr 2012
by Tom Igoe
This example code is in the public domain.
*/
#include <SPI.h>
#include <SD.h>
const int chipSelect = 10;
void setup() {
// Open serial communications and wait for port to open:
Serial.begin(9600);
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.");
}
void loop() {
// make a string for assembling the data to log:
String dataString = "";
// read three sensors and append to the string:
for (int analogPin = 0; analogPin < 3; analogPin++) {
int sensor = analogRead(analogPin);
dataString += String(sensor);
if (analogPin < 2) {
dataString += ",";
}
}
// open the file. note that only one file can be open at a time,
// so you have to close this one before opening another.
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
File dataFile = SD.open("datalog.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 datalog.txt");
}
}
My attempt:
/*
SD card datalogger
This example shows how to log data from three analog sensors
to an SD card using the SD library.
The circuit:
analog sensors on analog ins 0, 1, and 2
SD card attached to SPI bus as follows:
** MOSI - pin 11
** MISO - pin 12
** CLK - pin 13
** CS - pin 4 (for MKRZero SD: SDCARD_SS_PIN)
created 24 Nov 2010
modified 9 Apr 2012
by Tom Igoe
This example code is in the public domain.
*/
#include <SPI.h>
#include <SD.h>
int incomingByte = 0;
char sendCommand;
char c;
int con;
int interval;
long distance;
const int chipSelect = 10;
void setup() {
// Open serial communications and wait for port to open:
Serial.begin(9600);
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.");
}
void loop() {
// make a string for assembling the data to log:
String dataString = "";
delay(333);//recover memory time
// read three sensors and append to the string:
dataString += millis() / 1000;
dataString += ", ";
sendCommand = 0x55;
Serial.write(sendCommand);
sendCommand = 0xAA;
Serial.write(sendCommand);
sendCommand = 0xD3;
Serial.write(sendCommand);
sendCommand = 0x00;
Serial.write(sendCommand);
sendCommand = 0x02;
Serial.write(sendCommand);
sendCommand = 0xD5;
Serial.write(sendCommand);
con = 0;
distance = 0;
while (true) {
if (Serial.available() > 0)
{
incomingByte = Serial.read();
con++;//get next data
if (con == 6) {
distance = incomingByte;
}
if (con == 7) {
distance = (distance << 8) + incomingByte;//combine data 6 & 7
Serial.print("Distance=> ");
Serial.print(distance);
dataString += String(distance);
Serial.println("mm");
}
} else { //no value -> break out the while loop
break;
}
}
// open the file. note that only one file can be open at a time,
// so you have to close this one before opening another.
writeDat(dataString);
}
void writeDat(String datas) {
Serial.println(datas);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
File dataFile = SD.open("DATALOG.TXT", FILE_WRITE);
// if the file is available, write to it:
if (dataFile) {
dataFile.println(datas);
dataFile.close();
}
else {
Serial.println("error"); //this is the error that is being returned, the sd card is initializing but cant open the file
}
}
Working sensor example:
/******************************************
SHARP Corporation
MTOF17001 TOF module
for Arduino Mega2560 V1.0
Working range : 10cm~120cm (White Card)
Board Connection
Arduino ToF module
0pin TXD
1pin RXD
GND GND
3.3V Vcc
Serial monitor setting
9600bps
Example instructions:
@ Command name:CMD_RD_MM
@ Send instruction:55 AA D3 00 02 D5
@ Return instruction:55 AA D3 00z 02 01 02 D8 -> get value 6 & 7 -> 0x0102=258mm
@ Distance measure data( reply the "8888" when abnormal status)
******************************************/
int incomingByte = 0;
char sendCommand;
char c;
int con;
int interval;
long distance;
void setup() {
Serial.begin(9600);
}
void loop() {
delay(100);//recover memory time
sendCommand = 0x55;
Serial.write(sendCommand);
sendCommand = 0xAA;
Serial.write(sendCommand);
sendCommand = 0xD3;
Serial.write(sendCommand);
sendCommand = 0x00;
Serial.write(sendCommand);
sendCommand = 0x02;
Serial.write(sendCommand);
sendCommand = 0xD5;
Serial.write(sendCommand);
con = 0;
distance = 0;
while (true) {
if (Serial.available() > 0)
{
incomingByte = Serial.read();
con++;//get next data
if (con == 6) {
distance = incomingByte;
}
if (con == 7) {
distance = (distance << 8) + incomingByte;//combine data 6 & 7
Serial.print("Distance=> ");
Serial.print(distance);
Serial.println("mm");
}
} else { //no value -> break out the while loop
break;
}
}
}