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scaryghostscaryghost
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Added more example scripts
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‎examples/acc_threshold_detector.py‎

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# usage: python acc_threshold_detector [mac]
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from __future__ import print_function
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from mbientlab.metawear import MetaWear, libmetawear, parse_value
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from mbientlab.metawear.cbindings import *
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from time import sleep
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from threading import Event
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# CURRENT:
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# Sample accelerometer at 50Hz
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# Use the rms to combine X,Y,Z
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# Use the average to downsample to about 4Hz (averaging 8 samples)
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# Use the threshold detector to detect a bump
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# Also log all the event and download it later
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print("Searching for device...")
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d = MetaWear(sys.argv[1])
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d.connect()
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print("Connected to " + d.address)
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print("Configuring device")
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libmetawear.mbl_mw_settings_set_connection_parameters(d.board, 7.5, 7.5, 0, 6000)
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sleep(1.0)
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e = Event()
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def create_voidp(create, resource):
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result = [None]
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def handler(ctx, pointer):
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result[0] = RuntimeError("Could not create " + resource) if pointer == None else pointer
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e.set()
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callback_wrapper = FnVoid_VoidP_VoidP(handler)
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create(callback_wrapper)
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e.wait()
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e.clear()
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if (result[0] is RuntimeError):
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raise result[0]
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return result[0]
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def end_event_record(evt):
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result = [None]
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def handler(ctx, pointer, status):
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if (status != Const.STATUS_OK):
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result[0] = RuntimeError("Event recording returned a non-zero status (%d)" % (status))
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e.set()
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callback_wrapper = FnVoid_VoidP_VoidP_Int(handler)
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libmetawear.mbl_mw_event_end_record(evt, None, callback_wrapper)
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e.wait()
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e.clear()
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if (result[0] is RuntimeError):
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raise result[0]
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try:
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# setup accelerometer (odr 50Hz and 2Gs)
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libmetawear.mbl_mw_acc_bmi160_set_odr(d.board, AccBmi160Odr._50Hz)
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libmetawear.mbl_mw_acc_set_range(d.board, 2.0)
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libmetawear.mbl_mw_acc_write_acceleration_config(d.board)
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# start to setup rms->avg->thresh->log chain
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acc_signal = libmetawear.mbl_mw_acc_get_acceleration_data_signal(d.board)
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# create RMS - root mean square of acc X,Y,Z
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rms = create_voidp(lambda fn: libmetawear.mbl_mw_dataprocessor_rms_create(acc_signal, None, fn), "RMS")
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print("RMS created")
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# setup averager - averages over 8 RMS samples @ 50Hz
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avg = create_voidp(lambda fn: libmetawear.mbl_mw_dataprocessor_average_create(rms, 8, None, fn), "averager")
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print("Averager created")
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# setup event on avg - reset averager
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libmetawear.mbl_mw_event_record_commands(avg)
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libmetawear.mbl_mw_dataprocessor_average_reset(avg)
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end_event_record(avg)
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# setup threshold detector - detect anything above 1
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ths = create_voidp(lambda fn: libmetawear.mbl_mw_dataprocessor_threshold_create(avg, ThresholdMode.BINARY, 1.0, 0.0, None, fn), "threshold detector")
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print("Threshold detector created")
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# setup logger - log the final signal of the averaged data
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ths_logger = create_voidp(lambda fn: libmetawear.mbl_mw_datasignal_log(ths, None, fn), "threshold logger")
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print("Threshold logger created")
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# start accelerometer and event logging
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libmetawear.mbl_mw_acc_enable_acceleration_sampling(d.board)
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libmetawear.mbl_mw_acc_start(d.board)
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libmetawear.mbl_mw_logging_start(d.board, 0)
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# change this to any time amount you want
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print("Logging data for 10s")
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sleep(10.0)
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libmetawear.mbl_mw_acc_stop(d.board)
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libmetawear.mbl_mw_acc_disable_acceleration_sampling(d.board)
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libmetawear.mbl_mw_logging_stop(d.board)
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def progress_update_handler(context, entries_left, total_entries):
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if (entries_left == 0):
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e.set()
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fn_wrapper = FnVoid_VoidP_UInt_UInt(progress_update_handler)
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download_handler= LogDownloadHandler(context = None, \
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received_progress_update = fn_wrapper, \
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received_unknown_entry = cast(None, FnVoid_VoidP_UByte_Long_UByteP_UByte), \
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received_unhandled_entry = cast(None, FnVoid_VoidP_DataP))
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callback = FnVoid_VoidP_DataP(lambda ctx, p: print("threshold crossed: {epoch: %d, value: %s}" % (p.contents.epoch, parse_value(p))))
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libmetawear.mbl_mw_logger_subscribe(ths_logger, None, callback)
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libmetawear.mbl_mw_logging_download(d.board, 0, byref(download_handler))
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e.wait()
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except RuntimeError as err:
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print(err)
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finally:
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e.clear()
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print("Resetting device")
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d.on_disconnect = lambda status: e.set()
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libmetawear.mbl_mw_debug_reset(d.board)
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e.wait()

‎examples/calibrate.py‎

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# usage: python led.py [mac]
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from mbientlab.metawear import MetaWear, libmetawear, parse_value
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from mbientlab.metawear.cbindings import *
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from time import sleep
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from threading import Event
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import sys
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device = MetaWear(sys.argv[1])
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device.connect()
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print("Connected")
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e = Event()
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def calibration_data_handler(ctx, board, pointer):
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print("calibration data: %s" % (pointer.contents))
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libmetawear.mbl_mw_sensor_fusion_write_calibration_data(board, pointer)
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libmetawear.mbl_mw_memory_free(pointer)
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e.set()
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fn_wrapper_01 = FnVoid_VoidP_VoidP_CalibrationDataP(calibration_data_handler)
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signal = libmetawear.mbl_mw_sensor_fusion_calibration_state_data_signal(device.board)
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def calibration_handler(ctx, pointer):
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value = parse_value(pointer)
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print("state: %s" % (value))
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if (value.accelrometer == Const.SENSOR_FUSION_CALIBRATION_ACCURACY_HIGH and \
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value.gyroscope == Const.SENSOR_FUSION_CALIBRATION_ACCURACY_HIGH and \
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value.magnetometer == Const.SENSOR_FUSION_CALIBRATION_ACCURACY_HIGH):
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libmetawear.mbl_mw_sensor_fusion_read_calibration_data(device.board, None, fn_wrapper_01)
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else:
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sleep(1.0)
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libmetawear.mbl_mw_datasignal_read(signal)
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fn_wrapper_02 = FnVoid_VoidP_DataP(calibration_handler)
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libmetawear.mbl_mw_sensor_fusion_set_mode(device.board, SensorFusionMode.NDOF)
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libmetawear.mbl_mw_sensor_fusion_write_config(device.board)
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libmetawear.mbl_mw_datasignal_subscribe(signal, None, fn_wrapper_02)
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libmetawear.mbl_mw_sensor_fusion_start(device.board)
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libmetawear.mbl_mw_datasignal_read(signal)
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e.wait()
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print("Disconnecting")
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e.clear()
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device.on_disconnect = lambda s: e.set()
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libmetawear.mbl_mw_sensor_fusion_stop(device.board)
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libmetawear.mbl_mw_debug_disconnect(device.board)
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e.wait()

‎examples/multi_device.py‎

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@@ -18,7 +18,7 @@ def __init__(self, device):
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self.callback = FnVoid_VoidP_DataP(self.data_handler)
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def data_handler(self, ctx, data):
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#print("%s -> %s" % (self.device.address, parse_value(data)))
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print("%s -> %s" % (self.device.address, parse_value(data)))
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self.samples+= 1
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states = []
@@ -53,7 +53,7 @@ def data_handler(self, ctx, data):
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libmetawear.mbl_mw_datasignal_unsubscribe(signal)
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libmetawear.mbl_mw_debug_disconnect(s.device.board)
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sleep(1.0)
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sleep(30.0)
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print("Total Samples Received")
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for s in states:

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