Contributions:OpenBCISource - Revision history

Mellinger: /* OpenBCISource */

2025-06-29T15:49:10Z

OpenBCISource

← Older revision		Revision as of 15:49, 29 June 2025
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	===OpenBCISource===		===OpenBCISource===

	OpenBCISource can acquire data from OpenBCI Cyton board through serial port. It can automatically open port, set up baud rate and set up parity.		OpenBCISource can acquire data from OpenBCI Cyton board through serial port. It can automatically open a port, set up baud rate and set up parity.

	===OpenBCI===		===OpenBCI===

Akshayvyas: Undo revision 8268 by Akshayvyas (talk)

2019-06-11T16:03:00Z

Undo revision 8268 by Akshayvyas (talk)

← Older revision		Revision as of 16:03, 11 June 2019
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	===OpenBCISource===		===OpenBCISource===

	OpenBCISource can acquire data from OpenBCI Cyton~~-Daisy~~ board through serial port. It can automatically open port, set up baud rate and set up parity.		OpenBCISource can acquire data from OpenBCI Cyton board through serial port. It can automatically open port, set up baud rate and set up parity.

	===OpenBCI===		===OpenBCI===

Akshayvyas at 15:59, 11 June 2019

2019-06-11T15:59:56Z

← Older revision		Revision as of 15:59, 11 June 2019
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	===OpenBCISource===		===OpenBCISource===

	OpenBCISource can acquire data from OpenBCI Cyton board through serial port. It can automatically open port, set up baud rate and set up parity.		OpenBCISource can acquire data from OpenBCI Cyton-Daisy board through serial port. It can automatically open port, set up baud rate and set up parity.

	===OpenBCI===		===OpenBCI===

Mellinger: /* PortName */

2018-11-14T16:19:06Z

PortName

← Older revision		Revision as of 16:19, 14 November 2018
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	===PortName===		===PortName===
	The port ~~name is depend on~~ where ~~the user plug in~~ the Bluetooth ~~dangle~~. ~~One~~ the experimenter plugs in the ~~dangle~~, he can ~~check~~ the port name ~~from~~ ''~~Device~~ and ~~Printer~~'' on Windows.		The name of the port where the Bluetooth dongle is attached to. Once the experimenter plugs in the dongle, he can obtain the port name through ''Devices and Printers'' in Windows.

	==See also==		==See also==

Mellinger: /* Extension Board */

2018-11-14T16:17:00Z

Extension Board

← Older revision		Revision as of 16:17, 14 November 2018
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	===Extension Board===		===Extension Board===

	~~If the user want~~ to use ~~channel has index larger~~ than 8, ~~the user need to plug~~ in extension board~~. The~~ sampling rate will reduce to half of the original sampling rate		In order to use more than 8 channels, an extension board must be plugged in.
	and a linear interpolation will be used for up-sampling. The pins on the extension board have the same name as pins on the main board. The index for each channel on the extension board ~~are~~ equal to the pin number plus 8. The ground pin on the extension board also needs to be connected to ground.		With an extension board present, the sampling rate will reduce to half of the original sampling rate
			and a linear interpolation will be used for up-sampling. The pins on the extension board have the same name as pins on the main board. The index for each channel on the extension board is equal to the pin number plus 8. The ground pin on the extension board also needs to be connected to ground.

	==Steps to use OpenBCISource==		==Steps to use OpenBCISource==

Mellinger: /* SampleBlockSize */

2018-11-14T16:14:05Z

SampleBlockSize

← Older revision		Revision as of 16:14, 14 November 2018
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	Samples per channel per digitized block.		Samples per channel per digitized block.
	Together with the sampling rate, this parameter determines how often per second data are collected, processed, and feedback is updated. For example, at 500 Hz sampling and a SampleBlockSize of 20, the system (e.g., source signal display, signal processing, and stimulus presentation) will be updated 25 times per second.		Together with the sampling rate, this parameter determines how often per second data are collected, processed, and feedback is updated. For example, at 500 Hz sampling and a SampleBlockSize of 20, the system (e.g., source signal display, signal processing, and stimulus presentation) will be updated 25 times per second.
	For OpenBCI Cyton the sampling rate is 250Hz and it sends data to buffer every half second. So the ~~suggest~~ value for sample ~~bock~~ size is 125.		For OpenBCI Cyton the sampling rate is 250Hz and it sends data to buffer every half second. So the suggested value for sample block size is 125.
			Note that more frequent updating than two times per second is not possible without altering the OpenBCI firmware.

	===SamplingRate===		===SamplingRate===

Pbrunner: /* Extension Board */

2017-12-08T21:39:04Z

Extension Board

← Older revision		Revision as of 21:39, 8 December 2017
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	If the user want to use channel has index larger than 8, the user need to plug in extension board. The sampling rate will reduce to half of the original sampling rate		If the user want to use channel has index larger than 8, the user need to plug in extension board. The sampling rate will reduce to half of the original sampling rate
	and a linear interpolation will be used for up-sampling.		and a linear interpolation will be used for up-sampling. The pins on the extension board have the same name as pins on the main board. The index for each channel on the extension board are equal to the pin number plus 8. The ground pin on the extension board also needs to be connected to ground.

	==Steps to use OpenBCISource==		==Steps to use OpenBCISource==

Pbrunner at 21:36, 8 December 2017

2017-12-08T21:36:40Z

← Older revision		Revision as of 21:36, 8 December 2017
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	PC does NOT activate pull-up on RFduino pin 4		PC does NOT activate pull-up on RFduino pin 4

			===Extension Board===

			If the user want to use channel has index larger than 8, the user need to plug in extension board. The sampling rate will reduce to half of the original sampling rate
			and a linear interpolation will be used for up-sampling.

	==Steps to use OpenBCISource==		==Steps to use OpenBCISource==
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	2.Check the port of the Bluetooth dongle		2.Check the port of the Bluetooth dongle

	3.Run OpenBCISource and ~~set~~ the ~~port number~~		3.If use 16 channels mode, plug in the extension board.

			3.Run OpenBCISource and specify the list of channels.

	4.Click start button.		4.Click start button.

Pbrunner at 20:55, 19 September 2017

2017-09-19T20:55:35Z

← Older revision		Revision as of 20:55, 19 September 2017
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	PC does NOT activate pull-up on RFduino pin 4		PC does NOT activate pull-up on RFduino pin 4

	~~==Cyton Data Format==~~

	Each packet contains a header followed by a sample counter, followed by 8 ADS channel data, followed by the three axes values of the accelerometer, followed by a footer. The accelerometer data are optional, and don’t need to be sent with every packet when used. if unused, the bytes will read 0. This allows for user defined auxiliary data to be sent in the last six bytes before the footer. Also, there may be room for compressing more samples. Here are details on the format

	~~===Header===~~

	~~Byte 1: 0xA0~~

	~~Byte 2: Sample Number~~

	~~===EEG Data===~~

	~~Note: values are 24-bit signed, MSB first~~

	~~Bytes 3-5: Data value for EEG channel 1~~

	~~Bytes 6-8: Data value for EEG channel 2~~

	~~Bytes 9-11: Data value for EEG channel 3~~

	~~Bytes 12-14: Data value for EEG channel 4~~

	~~Bytes 15-17: Data value for EEG channel 5~~

	~~Bytes 18-20: Data value for EEG channel 6~~

	~~Bytes 21-23: Data value for EEG channel 7~~

	~~Bytes 24-26: Data value for EEG channel 8~~

	~~Bytes 27-28: Data value for accelerometer channel X~~

	~~Bytes 29-30: Data value for accelerometer channel Y~~

	~~Bytes 31-32: Data value for accelerometer channel Z~~

	~~===Footer===~~

	~~Byte 33: 0xCX where X is 0-F in hex~~

	~~==Convert 24-BIT SIGNED DATA VALUES==~~

	For the EEG data values, you will note that we are transferring the data as a 24-bit signed integer, which is a bit unusual. We are using this number format because it is the native format used by the ADS1299 chip that is at the core of the Cyton board. To convert this unusual number format into a more standard 32-bit signed integer, you can steal some ideas from the example Processing (aka, Java) code:

	~~int interpret24bitAsInt32(byte[] byteArray) {~~
	~~int newInt = (~~
	~~((0xFF & byteArray[0]) << 16) \|~~
	~~((0xFF & byteArray[1]) << 8) \|~~
	~~(0xFF & byteArray[2])~~
	);
	~~if ((newInt & 0x00800000) > 0) {~~
	~~newInt \|= 0xFF000000;~~
	~~} else {~~
	~~newInt &= 0x00FFFFFF;~~
	}
	~~return newInt;~~
	}

	==Steps to use OpenBCISource==		==Steps to use OpenBCISource==

Pbrunner: /* OpenBCISource */

2017-09-19T20:40:52Z

OpenBCISource

← Older revision		Revision as of 20:40, 19 September 2017
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	===OpenBCISource===		===OpenBCISource===

	OpenBCISource can ~~require~~ data from OpenBCI Cyton board through serial port. It can automatically open port, set up baud rate and set up parity.		OpenBCISource can acquire data from OpenBCI Cyton board through serial port. It can automatically open port, set up baud rate and set up parity.

	===OpenBCI===		===OpenBCI===