Fermion: Serial Data Logger Wiki - DFRobot

Introduction

Compared to the previous Fermion: MicroSD Card Module for Arduino (Breakout), this Fermion: Serial Data Logger can store data more conveniently, and supports direct data printing through serial port without additional codes. Fermion: Serial Data Logger supports 32GB TF card, making it suitable for long-time data storage. The device comes with a USB function, which means you can directly connect it to a PC computer to read the stored files without using a card reader. Meanwhile, with the onboard LED indicator, data writing status can be viewed visually. And the SAVE pin makes it easier to store data into separate files.

The upgraded V2.0 version compared to V1.0 version:

• Supports storage in TXT and CSV file formats.
• Significantly improves startup time and runtime stability.
• Supports scheduled creation of files for more flexible storage.
• Added USB port to make reading files more convenient.

For First Time Use

1. Format the SD card
2. 1 Press the "Win+R" keys and then enter "diskpart" to enter the command prompt interface
3. 2 Enter “list disk” to display the storage list
4. 3 Enter “select disk X” (X is the disk number of the SD card) to select the disk
5. 4 Enter “clean” to clear the disk partition information
6. 5 Enter “convert mbr” to convert the disk to MBR format
7. 6 Enter “create partition primary” to create a partition
8. 7 Enter “select partition 1” to select the created partition
9. 8 Enter “format fs=fat32 quick” to quickly format the disk to FAT32
10. Power on the module through the power supply of the UART interface for more than 2 seconds, so that the module automatically generates the CONFIG.TXT file.
11. Check whether the CONFIG.TXT file is generated normally. You can modify the module parameters by modifying CONFIG.TXT.
12. Connect the module to the main control serial port to store data normally.

Configuration file parameters Baud: Serial communication baud rate selection (00 corresponds to 2400 baud rate, 01 corresponds to 4800 baud rate). The module baud rate must match the baud rate of the main control serial port printing in order to store data normally.

FileNum: The file sequence number for the next new file (FileNum=0099, the next generated file name will be FILE0099.txt). The file sequence number automatically increments. If the file already exists, it will overwrite the current file.

FileFormat: File storage format, 0-TXT, 1-CSV.

Time: Automatically create files on schedule, 0-Do not create files on schedule, N-Create files every N minutes to store data [N: 0~10080 (one week)].

Note

1. Don't send data to the module serial port before CONFIG.TXT file is generated.
2. Don't connect the USB and serial ports at the same time.
3. Connect the PC through USB. It is recommended to eject the USB flash drive before removing the module.

Features

• With USB function, no card reader required
• Support multiple baud rates, with good compatibility
• LED indicator for viewing data writing status visually
• FAT32 file system, support 32GB TF card
• Supports storage in TXT and CSV file formats.
• Supports scheduled creation of files for more flexible storage.

Applications

• Offline data collection
• Capture product debug logs
• Robots and drones debug

Specification

• Supply Voltage: 3.3V~5V
• Operating Current: 10mA
• USB Protocol: USB2.0
• Operating Temperature Range: -20℃~65℃
• Operating Humidity Range: 5%RH~85%RH
• Dimension: 23×29mm/0.91×1.14"

Pinout

SD LED indicator is the one for data interaction between module and storage. It blinks when data is being written or a new file is being created.

Tutorial

Requirements

• Hardware
  • DFRduino UNO R3 x 1
  • Fermion: Serial Data Logger x 1
  • M-M/F-M/F-F Jumper wires

• Software
  • Arduino IDE

Connection Diagram

Sample Code 1 - Write Data

Write data to the module through Serial.print, save a file every once in a while.

#define SPIN 6  //Connect to the module Pin S, trigger to save files at low level 
uint16_t i = 0;

void setup(void)
{
  Serial.begin(9600);
  delay(2000);  //To aviod data lost, delay a period of time to wait for the module to start
  pinMode(SPIN, OUTPUT);
  digitalWrite(SPIN, HIGH);
}

void loop(void)
{
  Serial.println(String(i));
  i++;
  if((i % 10) == 0){
    digitalWrite(SPIN, LOW);
    delay(500);
    digitalWrite(SPIN, HIGH);
  }
  delay(300);
}

Sample Code 2 - Write data in CSV format

NOTE: In the config.txt file, set FileFormat to 1

#define SPIN 6  //Connect to the module Pin S, trigger to save files at low level 
uint16_t i = 0;

void setup(void)
{
  Serial.begin(9600);
  delay(2000);  //To aviod data lost, delay a period of time to wait for the module to start 
  pinMode(SPIN, OUTPUT);
  digitalWrite(SPIN, HIGH);
}

void loop(void)
{
  Serial.println(String(i));
  i++;
  if((i % 10) == 0){
    digitalWrite(SPIN, LOW);
    delay(500);
    digitalWrite(SPIN, HIGH);
  }
  delay(300);
}

FAQ

More Documents

• Schematics
• Dimensions