After studying for many years multi-channel EEG device demos based on the ADS1299 chip from Texas Instruments which could be a successor of OpenBCI, we almost have lost our hope that such a device will be on the market which fit s for our needs in near future. So our last hope on YouTube is How To Electronics. This channel has published sophisticated videos such as the:

IoT Based Patient Health Monitoring System using ESP32 Web Server:

or the

Do it Yourself Thermal Fever Detector with MLX90640 & OpenCV on Raspberry Pi:

Studying different instructions from How To Electronics and others, we came to the conclusion that at multi-channel EEG device based on TGAM modules,

the ADS1115 16-Bit Analog-to-Digital Converter, Arduino, ESP8266 & ESP32:

and InfluxDB should not be too difficult to build. We miss an instruction from How To Electronics how to do this.