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Python port for RaspberryPI of the HX711 Breakout Board
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import RPi.GPIO as GPIO | |
import time | |
def createBoolList(size=8): | |
ret = [] | |
for i in range(8): | |
ret.append(False) | |
return ret | |
class HX711: | |
def __init__(self, dout, pd_sck, gain=128): | |
self.PD_SCK = pd_sck | |
self.DOUT = dout | |
GPIO.setup(self.PD_SCK, GPIO.OUT) | |
GPIO.setup(self.DOUT, GPIO.IN) | |
self.GAIN = 0 | |
self.OFFSET = 0 | |
self.SCALE = 1 | |
self.lastVal = 0 | |
#GPIO.output(self.PD_SCK, True) | |
#GPIO.output(self.PD_SCK, False) | |
self.set_gain(gain); | |
def is_ready(self): | |
return GPIO.input(self.DOUT) == 0 | |
def set_gain(self, gain): | |
if gain is 128: | |
self.GAIN = 1 | |
elif gain is 64: | |
self.GAIN = 3 | |
elif gain is 32: | |
self.GAIN = 2 | |
GPIO.output(self.PD_SCK, False) | |
self.read() | |
def read(self): | |
while not self.is_ready(): | |
#print("WAITING") | |
pass | |
dataBits = [createBoolList(), createBoolList(), createBoolList()] | |
for j in range(2, -1, -1): | |
for i in range(7, -1, -1): | |
GPIO.output(self.PD_SCK, True) | |
dataBits[j][i] = GPIO.input(self.DOUT) | |
GPIO.output(self.PD_SCK, False) | |
#set channel and gain factor for next reading | |
#for i in range(self.GAIN): | |
GPIO.output(self.PD_SCK, True) | |
GPIO.output(self.PD_SCK, False) | |
#check for all 1 | |
if all(item == True for item in dataBits[0]): | |
return self.lastVal | |
bits = [] | |
for i in range(2, -1, -1): | |
bits += dataBits[i] | |
self.lastVal = int(''.join(map(str, bits)), 2) | |
return self.lastVal | |
''' | |
data = [0,0,0] | |
for i in range(0,3): | |
#print(''.join(map(str, dataBits[i]))) | |
data[i] = int(''.join(map(str, dataBits[i])), 2) | |
#print(data[i]) | |
#data[2] ^= 0x80 | |
return data[2] << 16 | data[1] << 8 | data[0] | |
''' | |
def read_average(self, times=3): | |
sum = 0 | |
for i in range(times): | |
sum += self.read() | |
return sum / times | |
def get_value(self, times=3): | |
return self.read_average(times) - self.OFFSET | |
def get_units(self, times=3): | |
return self.get_value(times) / self.SCALE | |
def tare(self, times=15): | |
sum = self.read_average(times) | |
self.set_offset(sum) | |
def set_scale(self, scale): | |
self.SCALE = scale | |
def set_offset(self, offset): | |
self.OFFSET = offset | |
def power_down(self): | |
GPIO.output(self.PD_SCK, False) | |
GPIO.output(self.PD_SCK, True) | |
def power_up(self): | |
GPIO.output(self.PD_SCK, False) | |
############# EXAMPLE | |
hx = HX711(9, 11) | |
hx.set_scale(7050) | |
hx.tare() | |
while True: | |
try: | |
val = hx.get_units(3) | |
if val > 100: | |
print("OH NO") | |
#hx.power_down() | |
#time.sleep(.001) | |
#hx.power_up() | |
except (KeyboardInterrupt, SystemExit): | |
sys.exit() |
how to calibrate this code??? can anyone help me..
Thank you
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What is the set_scale(7050) for?