def tare_ok(self, tare_list):
i = 0
# We compare each value in the tare_list and see if it is within the allowed TARE_WIDTH
# of the corresponding approximate expected reading in TARE_READINGS. Also the total
# of the readings must be within the config total +/- * TARE_WIDTH * 2.
# We will only return True if *all* tare readings and the tare_total are within acceptable bounds.
tare_delta_total = 0
max_delta = 0 # we track max delta for debug purposes
max_i = 0
while i < len(tare_list):
tare_delta = tare_list[i] - self.settings["TARE_READINGS"][i]
if abs(tare_delta) > max_delta:
max_delta = tare_delta
max_i = i
tare_delta_total += tare_delta
if abs(tare_delta) > self.settings["TARE_WIDTH"]:
if self.settings["LOG_LEVEL"] <= 2:
print(
"tare_ok FAIL reading[{}] {:.0f} out of range vs {:.0f} +/- {}"
.format(i, tare_list[i],
self.settings["TARE_READINGS"][i],
self.settings["TARE_WIDTH"]))
return False
else:
i += 1
if tare_delta_total > self.settings["TARE_WIDTH"]:
if self.settings["LOG_LEVEL"] == 1:
print(
"tare_ok total delta {} of [{}] is out of range for [{}] +/- {}"
.format(
tare_delta_total, list_to_string(tare_list, "{:+.0f}"),
list_to_string(self.settings["TARE_READINGS"],
"{:+.0f}"),
self.settings["TARE_WIDTH"]))
return False
if self.settings["LOG_LEVEL"] == 1:
print("tare_ok is OK, max delta[{}] was {:.0f}".format(
max_i, max_delta))
return True
def tare_scales(self):
t_start = time.process_time()
tare_list = []
# we 'tare' each sensor, this will also update the tare value used in each HX771 object
for hx in self.hx_list:
# Here we initialize the 'empty weight' settings
tare_list.append(hx.tare_A())
print("tare_scales readings [ {} ] completed at {:.3f} secs.".format(
list_to_string(tare_list, "{:+.0f}"),
time.process_time() - t_start))
# If the tare_list is 'ok' (i.e. within bounds) we will write it to the tare file and return it as the result
if self.tare_ok(tare_list):
print("tare_scales updating tare file.")
self.write_tare_file(tare_list)
return tare_list
# Otherwise.. the tare reading was NOT ok...
# The new tare readings are out of range, so use persisted values
tare_dictionary = self.read_tare_file()
tare_list = tare_dictionary["tares"]
# As the measured tare values are not acceptable, we now update the HX711 objects with the persisted values.
i = 0
for hx in self.hx_list:
hx.set_offset_A(tare_list[i])
i += 1
output_string = "tare_scales readings out of range, using persisted values [ {} ]"
print(output_string.format(list_to_string(tare_list, "{:+.0f}")))
return tare_list
def get_value(self):
t_start = time.process_time()
total_reading = 0
for hx in self.hx_list:
# get_weight accepts a parameter 'number of times to sample weight and then average'
reading = hx.get_weight_A(1)
total_reading = total_reading + reading
if self.settings["LOG_LEVEL"] == 1:
output_string = "get_weight readings [ {} ] completed at {:.3f} secs."
print(
output_string.format(list_to_string(debug_list, "{:+.0f}"),
time.process_time() - t_start))
return total_reading / self.settings["WEIGHT_FACTOR"] # grams
import sys
from classes.time_buffer import TimeBuffer
from classes.config import Config
from classes.sensor import Sensor
from classes.sensor_utils import list_to_string
print("test.py started with {} arguments: [{}]".format(len(sys.argv), list_to_string(sys.argv)))
if len(sys.argv) > 1 :
filename = sys.argv[1]
config = Config(filename)
else:
config = Config(None)
config.settings["VERSION"] = "TEST_0.1"
s = Sensor(settings = config.settings)
s.begin()
# for playback we can specify
# sleep=0.1 for a fixed period between samples
# or
# realtime=True which will pause the time between recorded sample timestamps.
# otherwise the playback will be as fast as possible.
t = TimeBuffer(settings=config.settings)
from classes.config import Config
from classes.sensor_utils import list_to_string
VERSION = "0.60"
# ----------------------------------------------------------------------
# ----------------------------------------------------------------------
# main code
# ----------------------------------------------------------------------
# ----------------------------------------------------------------------
if __name__ == "__main__":
print("main started with {} arguments {}".format(len(sys.argv),
list_to_string(sys.argv)))
if len(sys.argv) > 1:
filename = sys.argv[1]
config = Config(filename)
else:
config = Config()
config.settings["VERSION"] = VERSION
s = Sensor(settings=config.settings)
weight_sensor = WeightSensor(config.settings)
s.begin()