PipetteWrapper

The Opentrons API only allowed for use of all 8 channels of the multichannel pipette attachments. PipetteWrapper is used to wrap opentrons multichannel Pipette objects to allow the use of any number of channels while automatically tracking tip usage.

CURRENTLY REQUIRES A MODIFICATION TO LINE 67 IN opentrons/api/calibration.py:

CHANGE:

inst.pick_up_tip(container._container[0])

TO:

inst.pick_up_tip(location=container._container[0])

Installation

1. ssh into opentrons robot
2. Install from pypi: pip install pipettewrapper

Example

from pipettewrapper import PipetteWrapper
from opentrons import labware, instruments

tip_rack = labware.load('opentrons-tiprack-300ul', slot='4')
pipette = PipetteWrapper(instruments.P50_multi(mount='left', tip_racks=[tip_rack]))
plate = labware.load('96-flat')

pipette.distribute(50, plate.wells('A1'), plate.wells('A2'), num_tips=4)  # Uses 4 tips
pipette.transfer(50, plate.wells('A1'), plate.wells('A2'))  # Default behaviour (8 tips)