Contributions:BioPacADC
Synopsis
The BioPacADC source module enables signal acquisition from BioPac MP160
Location
http://www.bci2000.org/svn/trunk/src/private/SignalSource/BioPacADC
Versioning
Authors
Huiling Huang (huiling@neurotechcenter.org)
Juergen Mellinger (mellinger@neurotechcenter.org)
William Engelhardt (engelhardt@neurotechcenter.org)
Version History
- 2022-04-15: Initial public release by Huiling Huang (huiling@neurotechcenter.org)
Video Overview
Functional Description
The MP160 is implemented as both a BCI2000 source module and as a “logger.” As a source module, the MP160 is treated as the time base for data acquisition. This means that any peripheral devices will be sampled with respect to the MP160. You should implement the MP160 as a bci2000 source module if this is your primary electrophysiological signal acquisition device. As a logger, the MP160 is implemented alongside a primary electrophysiological amplifier. This means data acquired from the MP160 is resampled to the primary source device. You should implement the MP160 as a logger if you are using it to acquire additional biometric information (such as skin conductance or respiration) but want to use another device for your primary electrophysiological amplifier.
In this tutorial, we will implement the MP160, BN-RSPEC, BN-EGG2, BN-EMG2, and BN-PPGED into BCI2000, which will allow us to acquire the respiration signal, electrogastrogram, electromyogram, and electrodermal signal.
Hardware Set Up
Figure 1 shows all the necessary hardware from MP160. Make sure you have the MP160 and a wireless amplifier, the power supply for the MP160, an Ethernet USB adapter, and an Ethernet cable that can connect your MP160 with the BCI2000 PC. You will also need the Windows BCI2000 PC that will be running BCI2000. The hardware connection is simple(Figure 2). Using the Ethernet cable, plug one end into the MP160 and the other end into the Ethernet USB adapter. Then connect the adapter to the BCI2000 PC. Alternatively, if your PC has an Ethernet port, you could directly connect the PC with the MP160 using an Ethernet cable.
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Figure 1: BioPac hardware. -
Figure 2: Hardware connection.
Calibration
For skin conductance measurements, we need to first calibrate the amplifier before data are acquired. After configuration setup, press “Set Config”, and a dialog will pop up. Then disconnect the leads to the electrodes and press “Calibrate”. Once the calibration is successful, you can reconnect the patient and record data.
Signal Info
| Signal Type | Signal Range | Signal Resolution |
|---|---|---|
| Respiration | [-10, 10] V | 13 bits |
| EDA | [0, 50] µS | 13 bits |
| EGG | [-10, 10] mV | 16 bits |
| EMG | [-10, 10] mV | 16 bits |
Parameters
SourceCh
The number of connected channels of MP160. This number must exactly match the number of wireless transmitters you are planning to connect to the MP160.
SampleBlockSize
The number of samples to acquire for every system clock.
SamplingRate
The MP160 supports the following sampling rates: 0.1, 0.125, 0.2, 0.25, 0.4, 0.5, 0.625, 1, 1.25, 2, 2.5, 4, 5, 6.25, 10, 20, 25, 40, 50, 62.5, 100, 125, 200, 250, 400, 500, 625, 1000, 1250, 2000, 2500, 4000, 5000, 6250, 10000, 12500, 20000, 25000, 40000, 50000, 100000, 20000HZ. The maximum sampling rate for BN-RSPEC, BN-PPGED, BN-EGG2, and BN-EMG2 is 2000HZ. So in our case, the maximum sampling rate here is 2000HZ.
SourceChMatrix
The information of the connected channels. You need to specify the channel ID and corresponding signal types in this matrix.
StreamChMatrix
The channel you wish to be shown in the stream window rather than be shown in the source signal window. For example, if you are acquiring EGG and EMG signals from the MP160, but you only want to monitor the EGG signal in the source signal window, then you can config the EMG signal to be shown in StreamChMatrix.