Published November 20, 2020 © MIT

Optimized Data Logger (3000 Datapoints/sec)

If you're trying to log data from sensors fast, this device is promising. I have optimized the code for fast data logging for any sensor.

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Optimized Data Logger (3000 Datapoints/sec)

Things used in this project

Hardware components

LED (generic)

Arduino Mega 2560

Graphic OLED, 128 x 64

Flash Memory Card, SD Card

Elegoo SD Card Reader/Writer

Single Turn Potentiometer- 100k ohms

DFRobot Gravity:Digital Push Button (Yellow)

SparkFun Breadboard Power Supply Stick 5V/3.3V

Hand tools and fabrication machines

Wire Wrap Tool, Pencil

Soldering iron (generic)

Wire Stripper & Cutter, 18-10 AWG / 0.75-4mm² Capacity Wires

Story

This year my research project involves running ML models on collected EMG data. For my project, I need to be able to collect as many datapoints (EMG signals) as possible in a set time frame. Due to this need, I have created a data logger that can record and store EMG data values as fast as possible. Currently, it can measure up to 3,000 data points per second (Calculated using Arduino Serial Monitor Time Output).

The code I have developed can easily be used for any sensor so I thought it was worth sharing.

This code can:

Store recorded values onto SD card
Display readings on an OLED display
Has a button to start recordings for a set amount of time
Has a potentiometer to change the file name that the data is saved to on the SD card

This code can be made better. Due to my lack of knowledge in Port Manipulation, I don't know how to code without using Arduino based functions such as analogRead() or String(). If you do know how I could optimize my code further please let me know. I would be happy to update my project.