FreeEEG32 alpha1.0 -- test failed, wired bug fixes

24 bits, 4kSPS, WIFI, Accel & hyro,
SD, Isolated SPI, UART, USB, power

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use new version: FreeEEG32 + alpha1.5,

Old version FreeEEG32 alpha1.0 -- alpha test failed, don't work without wired bug fixes,

32 channels mobile electroencephalography under GNU AGPL,


Estimation on components

ESP8266 not worked in this configuration, because it radiates on nearby channels.

Data and power over USB only working good when clean power -- from OrangePi for example, another way there will be noise from USB line.

So better separate power from USB, what was before USB and ESP8266 was added in last moment and not tested.

So in FreeEEG32 alpha1.05 made changes that ESP8266 module was excluded, and UART isolator was not used, and only used power isolator for power supply from battery. 

And SPI isolator was fixed so it can pass UART, so this isolated UART used to connect to external ESP32 devboard, to be used as USB when ESP32 disabled, or can be used as WiFi.

New changes will be tested in FreeEEG32 prealpha2

Made FreeEEG32+ alpha1.5 with all bug fixes that was found in alpha1 test.

spreadsheet - 86.69 kB - 04/18/2017 at 08:09



Zip Archive - 165.03 kB - 04/15/2017 at 21:37


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  • 4 × ADR4525BRZ Power Management ICs / Voltage References
  • 1 × DA2303-ALD Inductors, Chokes, Coils and Magnetics / Current, Voltage and Power Transformers
  • 2 × MBR0520LT1G Discrete Semiconductors / Diodes and Rectifiers
  • 1 × ISO7341CDW Robust EMC, Low Power, Quad-Channel 3/1 Digital Isolator, Fail-Safe High

View all 32 components

View all 4 project logs

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Dmitry Sukhoruchkin wrote 05/27/2019 at 12:11 point

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