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Cedar Grove Maker Studios 2023-01-13 08:57:15 -08:00
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examples/xnau7802_simpletest.py
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# SPDX-FileCopyrightText: 2023 Cedar Grove Maker Studios
# SPDX-License-Identifier: MIT
"""
nau7802_simpletest.py 2023-01-13 2.0.0 Cedar Grove Maker Studios
Instantiates two NAU7802 channels with default gain of 128 and sample
average count of 100.
"""
import time
import board
from cedargrove_nau7802 import NAU7802
# Instantiate 24-bit load sensor ADC; two channels, default gain of 128
nau7802 = NAU7802(board.I2C(), address=0x2A, active_channels=2)
def zero_channel():
"""Initiate internal calibration for current channel.Use when scale is started,
a new channel is selected, or to adjust for measurement drift. Remove weight
and tare from load cell before executing."""
print(
"channel %1d calibrate.INTERNAL: %5s"
% (nau7802.channel, nau7802.calibrate("INTERNAL"))
)
print(
"channel %1d calibrate.OFFSET: %5s"
% (nau7802.channel, nau7802.calibrate("OFFSET"))
)
print("...channel %1d zeroed" % nau7802.channel)
def read_raw_value(samples=100):
"""Read and average consecutive raw sample values. Return average raw value."""
sample_sum = 0
sample_count = samples
while sample_count > 0:
while not nau7802.available:
pass
sample_sum = sample_sum + nau7802.read()
sample_count -= 1
return int(sample_sum / samples)
# Instantiate and calibrate load cell inputs
print("*** Instantiate and calibrate load cells")
# Enable NAU7802 digital and analog power
enabled = nau7802.enable(True)
print("Digital and analog power enabled:", enabled)
print("REMOVE WEIGHTS FROM LOAD CELLS")
time.sleep(3)
nau7802.channel = 1
zero_channel() # Calibrate and zero channel
nau7802.channel = 2
zero_channel() # Calibrate and zero channel
print("READY")
### Main loop: Read load cells and display raw values
while True:
print("=====")
nau7802.channel = 1
value = read_raw_value()
print("channel %1.0f raw value: %7.0f" % (nau7802.channel, value))
nau7802.channel = 2
value = read_raw_value()
print("channel %1.0f raw value: %7.0f" % (nau7802.channel, value))