FreeBCI 16-Channel RS422-I EEG Acquisition Module with Shell ADS1299 STM32 RS422/UART Compatible Interface

FreeBCI 16-Channel RS422-I EEG Acquisition Module with Shell ADS1299 STM32 RS422/UART Compatible Interface

Description:
- The communication interface is RS422/UART compatible. When shipped, it can be configured as either RS422 or UART (3.3V logic level) interface according to user requirements. Users can also solder relevant components according to the instructions and configure them as the required interface.
- The RS422/UART interface is physically DB9, and both power supply and communication are implemented through this interface. Whether it is the RS422 interface or the UART interface, the signal and power are isolated, with a signal isolation voltage of 6000V and a power isolation voltage of 5000V. Isolation is safer and can reduce common mode interference, resulting in better signal quality.
- ADS1299 is driven by STM32 processor to achieve EEG acquisition.
- By issuing commands, the serial port baud rate can be configured to 115200 or 921600, supporting multiple sampling rates such as 250, 500, 1000, 2000, etc. The maximum support for synchronous sampling is 2000 sampling rate in 8-channel and 1000 sampling rate in 16 channel.
- Support configuring the working mode of ADS1299 through communication protocol, which can be configured as differential, SRB1 common reference, SRB2 common reference, BIAS common mode negative feedback output and other working modes.
- Providing self-developed executable programs for upper computer for Python, which can achieve various functions such as waveform display, real-time FFT spectrum calculation, EEG band calculation, data file storage, and real-time forwarding of LSL network data streams.
- The EEG data stream can be forwarded in real-time through LSL and imported into EEGLab for convenient subsequent processing.
- Two Qwiic interfaces are reserved for hardware, and software can be customized to expand Qwiic sensors externally.
- Providing communication protocols and support secondary development.

Typical Application 1: Connect the PC end upper computer software directly through a USB to RS422 cable.
- At this point, configure the acquisition board as an RS422 interface, communicate with the acquisition board through a USB to RS422 cable, and power is provided by the USB port. Then, in the upper computer acquisition software, you can directly communicate with the acquisition board to complete EEG data acquisition.
- The advantages of configuring as RS422 interface are long transmission distance and strong anti-interference ability.
- This application scenario can adapt to situations that require remote EEG acquisition and bus wiring.

Typical Application 2: Through UART port and Raspberry Pi board communication, the Raspberry Pi controls the acquisition board to achieve EEG acquisition.
- At this point, configure the acquisition board as a UART interface and connect it to the DB9 interface of the acquisition board through the 4, 6, 8, and 10 pins of the Raspberry Pi. In the Raspberry Pi, communicate with the acquisition board through the serial port to complete EEG data acquisition.
- Other boards with strong processing capabilities, such as STM32F7/H7 series or even FPGA, can be used to control the acquisition board through UART port to achieve EEG acquisition.

Applications:
- Suitable for those who want to use Raspberry Pi STM32F4/F7/H7, even boards with strong processing capabilities such as FPGA are used to control the development and algorithm research of this EEG acquisition board for EEG acquisition.
- Suitable for users who want to remotely acquisite EEG through bus wiring.
- This acquisition board can be embedded as a module into the user's large system, for example, by connecting it to the STM32H7 processor to achieve EEG acquisition function, and then expanding other functions such as blood oxygen signal acquisition and sleep research on this basis.
- Providing communication protocols, suitable for users who require secondary development.

Package Included:
- 1 x EEG Acquisition Module

Note:
- This product is only for scientific research or learning purposes and is not a medical product. It cannot be used for official diagnosis or medical purposes.