India's first open-hardware 32-channel EEG / biopotential acquisition board — a quad-ADS1299 analog front end driven by a dual-ATmega328 controller, designed in EAGLE by Soul Scientific in 2015, and just now open-sourced under Apache-2.0.
Adam-EEG packs four Texas Instruments ADS1299 24-bit, 8-channel simultaneous-sampling analog front ends onto one board — 32 truly simultaneous EEG channels, daisy-chained over a single SPI bus — with onboard microSD logging for fully standalone (untethered) recording. No host PC, no muxing, no compromise on channel count to hit a price point.
Why this exists
Research-grade multichannel EEG hardware is expensive and closed. A clinical 32-channel amplifier system routinely runs into five figures (USD), locked behind proprietary software and NDAs on the actual analog front-end design. If you wanted to actually learn how a real biopotential acquisition chain works — the bias-drive loop, the lead-off detection, the reference architecture — you couldn't just open the schematic and look.
Adam-EEG set out to prove something narrower and more useful: that a 32-channel, simultaneous-sampling, standalone-logging EEG board could be built from commodity parts, in a hobbyist CAD tool (EAGLE, not a $10k professional suite), at a fraction of the cost — and that the full schematic and board could just be public. Not a black box, not a paywalled datasheet. A real board you can open, trace net-by-net, and build.
