Last Updated on September 30, 2023 by pg@petergamma.org
FreeEEG32 was presented 3 years ago on hackster:
but where else? It uses a 8-Channel, 24-Bit, Simultaneous Sampling ADC Data Sheet AD7771:
https://www.mouser.com/datasheet/2/609/AD7771-1501978.pdf
OpenBCI and PiEEG use the ADS1299 EEG chip:
https://www.ti.com/lit/ds/symlink/ads1299.pdf
Only the ADS1299 EEG chip with 8 channel is on Aliexpress around 100 USD:
https://vi.aliexpress.com/item/1005005717604246.html
But FreeEEG32 offers 32 channels for $199 USD? That’s a real bargain? And will your paper be accepted if you use FreeEEG32 for your reserach project? Only view papers use FreeEEG32 to this date:
https://scholar.google.com/scholar?hl=de&as_sdt=0%2C5&q=FreeEEG32&btnG=
- One paper stroke us the most, and that is “The Free EEG 32 project”, which is listed multiple times.
- But papers which use FreeEEG32 seem to be hardly cited.
- If we look for FreeEEG32 under Google picture search:
We can see that there are only view projects which use FreeEEG32.
On the other hand, there are a lot of papers and projects which use OpenBCI modules with the ADS1299 chip from Texas instruments. What might be the reason?
Comparison table on crowd supply:
| FreeEEG32 | OpenBCI Cyton | KT88-3200 | Mitsar 202 | |
|---|---|---|---|---|
| Microcontroller | STM32H743 | PIC32MX250F128B | – | – |
| Channels | 32 | 8 | 32 | 32 |
| Resolution (bits) | 24 | 24 | 12 | 24 |
| Max Programmable Gain Amplification (PGA) | 8x | 24x | Unknown | Unknown |
| Open Source | Yes | Yes | No | No |
| Price (in USD) | $199 | $500 (price varies between 230 USD for cable verssion and 1000 USD incl. Bluetooth dongle) | $1000 | $10,500 |
https://www.crowdsupply.com/neuroidss/freeeeg32#products
The Max Programmable Gain Amplification (PGA) is 8x for FreeEEG32 compared to 24x for OpenBCI and PiEEG.
- According to the Crowd supply page FreeEEG32 is no longer available.
- We have reported previously about FreeEEG32:
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