device.magnets_probes module

class device.magnets_probes.MagnetsProbes(buses, **kwargs)

Bases: HardwareBase

Set of 8 Arduino based measuring instruments (magnets experiment).

Parameters:

list (buses) – specify the 8 names (str) of serial buses where Arduinos are connected, e.g. /dev/ttyUSB0

Communication:

• serial interface to 8+1 Arduino devices

• this class mainly takes care of measurement sync between the 8+1 probes

ALL_IDS = ['1', '2', '3', '4', '5', '6', '7', '8', '9']

measure(device_client, duration, dt)

Trigger a short synchronized measurement using all probes. Data is saved to file and emitted to server.

• Estimated error in time-sync between probes = 0.5ms

• Time resolution ~ 0.1ms

• Signal resolution ~ 0.0006

Parameters:

• duration (float) – total duration of measurement [s], note that there is an upper limit 20_000 samples

• dt (float) – time between two samples [s], minimal is 1ms

measure_single()

Measure one sample on each probe. Returns numpy array containing integrated and raw value for each probe, shape=(8, 2). Order of the probes corresponds to the property probe_ids.

Note

This method is useful mainly for realtime plotting and does not guarantee best precision (time-sync, sampling rate). See measure().

property probe_ids

stop_plot()

update_frontend(device_client)

view_plot(probe_id)