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#!/usr/bin/env python3
# vim:tabstop=4 softtabstop=4 shiftwidth=4 textwidth=160 smarttab expandtab colorcolumn=160
#
# Copyright (C) 2023 Daniel Friesel
#
# SPDX-License-Identifier: GPL-2.0-or-later
from matplotlib import cm
import matplotlib.pyplot as plt
import numpy as np
import sys
matplotlib_theme = "fast"
def parse_file(filename, in_channel, out_channel):
readings = list()
with open(filename, "r") as f:
for line in f:
if line.startswith("#"):
continue
timestamp, channel, voltage = line.split()
timestamp = float(timestamp)
channel = int(channel)
voltage = float(voltage)
if abs(voltage) > 1:
readings.append((timestamp, channel, voltage))
vin_t = list()
vout_t = list()
vout_vin = list()
last_vin = None
last_vout = None
for timestamp, channel, voltage in readings:
if channel == in_channel:
vin_t.append((timestamp, voltage))
if last_vin is not None and last_vout is not None:
vout_vin.append((np.mean((last_vin, voltage)), last_vout))
last_vin = voltage
elif channel == out_channel:
vout_t.append((timestamp, voltage))
if last_vin is not None and last_vout is not None:
vout_vin.append((last_vin, np.mean((last_vout, voltage))))
last_vout = voltage
return np.array(vin_t), np.array(vout_t), np.array(vout_vin)
def main(files):
plt.style.use(matplotlib_theme)
handles = list()
cmap = cm.get_cmap("winter")
in_channel = int(files.pop(0))
out_channel = int(files.pop(0))
for i, pair in enumerate(files):
current, filename = pair.split("=")
vin_t, vout_t, vout_vin = parse_file(filename, in_channel, out_channel)
(handle,) = plt.plot(
vout_vin[:, 0],
vout_vin[:, 1],
linestyle="none",
marker="s",
color=cmap(i / len(files)),
markersize=2,
label=current,
)
handles.append(handle)
plt.legend(handles=handles, title="Output Current [mA]")
plt.title("MT3608 Output Voltage Stability")
plt.xlabel("Input Voltage [V]")
plt.ylabel("Output Voltage [V]")
plt.show()
if __name__ == "__main__":
main(sys.argv[1:])
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