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Add an option for setting maximum current limit #5

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Add an option for setting maximum current limit #5

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2d61b8e
Add an option for setting maximum current limit
ilario Jul 6, 2017
59d5ed7
Merge branch 'master' into master-max_current
ilario Jul 12, 2017
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3 changes: 2 additions & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -26,7 +26,7 @@ cd mppTracker
$ ./mppTracker.py -h
usage: mppTracker.py [-h] [--dummy] [--visa_lib VISA_LIB] [--reverse_polarity]
[--file FILE] [--scan]
[address] [t_dwell] [t_total]
[address] [t_dwell] [t_total] [max_current]

Max power point tracker for solar cells using a Keithley 2400 sourcemeter
(hopefully robust enough for perovskites). Data is written to stdout and human
Expand All @@ -36,6 +36,7 @@ positional arguments:
address VISA resource name for sourcemeter
t_dwell Total number of seconds for the dwell phase(s)
t_total Total number of seconds to run for
max_current Maximum current limit (amperes)

optional arguments:
-h, --help show this help message and exit
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6 changes: 5 additions & 1 deletion mppTracker.py
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Expand Up @@ -17,6 +17,7 @@
parser.add_argument("address", nargs='?', default=None, type=str, help="VISA resource name for sourcemeter")
parser.add_argument("t_dwell", nargs='?', default=None, type=int, help="Total number of seconds for the dwell phase(s)")
parser.add_argument("t_total", nargs='?', default=None, type=int, help="Total number of seconds to run for")
parser.add_argument("max_current", nargs='?', default=None, type=float, help="Maximum current limit (amperes)")
parser.add_argument('--dummy', default=False, action='store_true', help="Run in dummy mode (doesn't need sourcemeter, generates simulated device data)")
parser.add_argument('--visa_lib', type=str, help="Path to visa library in case pyvisa can't find it, try C:\\Windows\\system32\\visa64.dll")
parser.add_argument('--reverse_polarity', default=False, action='store_true', help="Swaps voltage polarity on output terminals.")
Expand Down Expand Up @@ -263,7 +264,10 @@ def close(self):
##NOTE: what if Isc degrades the device? maybe I should only sweep backwards
##until the power output starts dropping instead of going all the way to zero volts...
sweepParams = {} # here we'll store the parameters that define our sweep
sweepParams['maxCurrent'] = 0.01 # amps
if args.max_current is None:
sweepParams['maxCurrent'] = 0.01 # amps
else:
sweepParams['maxCurrent'] = args.max_current
sweepParams['sweepStart'] = Voc # volts
sweepParams['sweepEnd'] = 0 # volts
sweepParams['nPoints'] = 1001
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