Download Latest Version ECG Logger v3.1.5.hex (86.0 kB)
Email in envelope

Get an email when there's a new version of ECG Logger

Home / HEX files
Name Modified Size InfoDownloads / Week
Parent folder
ECG Logger v3.1.5.hex 2022-03-14 86.0 kB
3 3 weekly downloads
ECG Logger v3.1.3.hex 2021-09-13 86.4 kB
0
ECG Logger v3.1.2.hex 2021-09-06 86.4 kB
0
ECG Logger v1.6.0_with_bootloader.hex 2018-05-12 89.8 kB
0
ECG Logger v1.6.0.hex 2018-05-10 86.3 kB
0
ECG Logger v1.5.4.hex 2018-03-22 84.9 kB
0
ECG Logger v1.5.3.hex 2017-09-08 85.0 kB
0
Totals: 7 Items   604.9 kB 3

ECG Logger - Rythmic HOLTER by AdNovea (c)2017-2021

ECG Logger is a Wearable Cardiac Monitor for Long-Term Data Acquisition and Analysis.

The ECG Logger project is aimed for providing a very low-cost open-source "Hardware and Software" for a Rhythmic Holter. The hardware has been made very simple and is based on an Arduino Nano micro-controller with three companion boards for the SD card mass-storage, the instrumentation differential amplifier and the Real time clock. It can help monitoring arrhythmia syndromes such as bradycardia, tachycardia, extra-systoles or pause. In no case it can be use to replace a professional medical examination.

WARNING: DO NOT connected hardware to sources powered by mains (e.g. PC, DC pack, etc.)

This original work is the property of Laurent (AdNovea(r)) and is provided ASIS.
(https://sourceforge.net/u/adnovea)

DOCUMENTATION

All the ECG LOGGER project documentation has been moved into the Application software help file including the information related to the hardware building and schematic.
If the help CHM file is run from a network drive, the web page content will not display.

DEVICE SPECIFICATIONS

  • Number of Channels: 1
  • Lead: standard 3-lead
  • Sampling Rate: 250 Hz
  • Sampling Accuracy: 10-bit / 8-bit selectable
  • Recording Time: up to 24 Hours
  • Time accuracy: +/- 1 minute per day
  • Interface: USB 2.0
  • Scale Voltage: 1 mV ±5%
  • Sensitivity valve: ≤20μV (TBC)
  • Lowest voltage signal: 50 μ Vpp (TBC)
  • Input Impedance: ≥ 1GΩ
  • Input circuit bias current: ≤ 0.1 μA
  • Noise level: ≤ 10 μ Vpp (0.1 Hz to 40 Hz)
  • Common-Mode Rejection Ratio: >= 60 dB (DC to 60Hz)
  • Electrode offset rejection: ± 300 mV
  • Voltage tolerance: ± 500 mV
  • Time constant: ＞ 3.2 s (0.3Hz)
  • Frequency response: 0.05 ~ 150 Hz
  • Filter: AC, EMG, Drift Filter, RFI
  • Complex QRS detection: Pan & Tompkins algorithm
  • Safety Human Body Model: 8 kV ESD (HBM)
  • Real time clock for files timestamp

** Physical Parameters:**

  • Type B* internally powered
  • Size (L x W x H) : 100 x 60 x 25 mm
  • Net weight (w/o battery): 76 g
  • Weight with batteries: 121g
  • Total weight: 205 g (incl. carrier/electrodes)
  • Power: 4 x AAA batteries / 950mAh or more Ni-MH rechargeable batteries
  • Autonomy: >30 hours with Alkaline batteries / >24h with rechargeable batteries

** Average consumption:**

  • Normal mode: 17 mA (Standby)
  • Sleep mode: 6.2 mA
  • Recording mode: 31 mA (~36 hours - depend on SD Card)

VERSIONS

3.1.5 2022-01-20

  • Baudrate for data transfer can be changed up to 1MB/s but SDC limits max speed
  • Modified HLR file download protocol (required new F/W)

3.1.4 2021-12-17

  • Code optimization

3.1.3 2021-09-12:

  • Add reset to factory
  • Add debug mode

3.1.2 2021-09-06:

  • Change H(our) command to C(clock) command
  • Code refactoring

3.1.1 2021-08-17:

  • Save Rec- ording time, Noise filter and battery factor into EEPROM
  • Add save command to write parameters into EEPROM

3.1.0 2021-08-14 (ECG Logger device requires new Hardware and Firmware V3.1):

  • Add RTC for date-time saving while powered-off
  • Add buzzer to improve user interface
  • Info file is dedicated for each recording
  • Directory list has new syntax : LS
  • Serial baudrate selection removed

3.0.1 2020-09-02 (not released):

  • Remove HiRes 10-bit mode for Holter mode
  • Remove R-peak detection
  • PARAMS command has new syntax: PARAMS=batt factor value

1.6.1 2020-08-30 (not released):

  • Code optimization (no change in features)
  • Fix error: log file deletion

1.6.0 2018-05-10:

  • Add ECG noise pre-filtering (HF) with FILTER ON/OFF command
  • Add STATUS command to display Resolution and Recording time parameters
  • Change QRS detection parameters values
  • Change Free stack code for saving space
  • BUG FIX: R-peak type were not saved into data blocks

1.5.4:

  • Change Pause conditions from R-R percentage to R-R duration
  • Change default Pause duration to > 2 secs
  • Change default Bradycardia to < 55 BPM
  • Change default Tachycardia to > 100 BPM

1.5.3:

  • Initial release
Source: README.md, updated 2022-03-14