def connect_device(self):
"""
:return:
"""
self.device = OpenBCIBoard(port=self.device_port)
class OpenBCIConnector(Connector):
def __init__(self,
publishers,
buffer_size,
step_size,
device_type='openbci',
device_port='/dev/tty.OpenBCI-DN0094CZ',
device_mac=None):
"""
:return:
"""
super(OpenBCIConnector,
self).__init__(publishers, buffer_size, step_size, device_type,
device_port, device_mac)
def connect_device(self):
"""
:return:
"""
self.device = OpenBCIBoard(port=self.device_port)
def start(self):
# callback functions to handle the sample for that metric (each metric has a specific number of channels)
cb_functions = {
metric:
self.callback_factory(metric,
get_num_channels(self.device_name, metric))
for metric in self.metrics
}
self.device.start(cb_functions)
def callback_factory(self, metric_name, num_channels):
"""
Callback function generator for OpenBCI metrics
:return: callback function
"""
def callback(sample):
"""
Handle OpenBCI samples for that metric
:param sample: the sample to handle
"""
message = {}
for i in range(8):
channel_value = "%.4f" % (sample.channel_data[i] * 10**9
) # Nano volts
message["channel_%s" % i] = channel_value
message['timestamp'] = int(time.time() *
1000000) # micro seconds
self.buffers[metric_name].write(message)
return callback
class OpenBCIConnector(Connector):
def __init__(self, publishers, buffer_size, step_size, device_type='openbci', device_port='/dev/tty.OpenBCI-DN0094CZ', device_mac=None):
"""
:return:
"""
super(OpenBCIConnector, self).__init__(publishers, buffer_size, step_size, device_type, device_port, device_mac)
def connect_device(self):
"""
:return:
"""
self.device = OpenBCIBoard(port=self.device_port)
def start(self):
# callback functions to handle the sample for that metric (each metric has a specific number of channels)
cb_functions = {metric: self.callback_factory(metric, get_num_channels(self.device_name, metric))
for metric in self.metrics}
self.device.start(cb_functions)
def callback_factory(self, metric_name, num_channels):
"""
Callback function generator for OpenBCI metrics
:return: callback function
"""
def callback(sample):
"""
Handle OpenBCI samples for that metric
:param sample: the sample to handle
"""
message = {}
for i in range(8):
channel_value = "%.4f" %(sample.channel_data[i]*10**9) # Nano volts
message["channel_%s" % i] = channel_value
message['timestamp'] = int(time.time() * 1000000) # micro seconds
self.buffers[metric_name].write(message)
return callback
def connect_device(self):
"""
:return:
"""
self.device = OpenBCIBoard(port=self.device_port)
