Created
March 29, 2019 15:53
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DYMO usb scale reading (multiple scales)
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import sys | |
import usb.core | |
VENDOR_ID = 0x0922 | |
PRODUCT_ID = 0x8003 | |
# find USB devices | |
devices = list(usb.core.find(find_all=True, idVendor=VENDOR_ID, | |
idProduct=PRODUCT_ID)) | |
# loop through devices, printing vendor and product ids in decimal and hex | |
print("len=",len(devices)) | |
masses=[] | |
sum=0 | |
for device in devices: | |
cfg=device | |
#sys.stdout.write('Decimal VendorID=' + str(cfg.idVendor) + ' & ProductID=' + str(cfg.idProduct) + '\n') | |
#sys.stdout.write('Hexadecimal VendorID=' + hex(cfg.idVendor) + ' & ProductID=' + hex(cfg.idProduct) + '\n\n') | |
#print("device=",device) | |
device.set_configuration() | |
# first endpoint | |
endpoint = device[0][(0,0)][0] | |
# read a data packet | |
attempts = 10 | |
data = None | |
while data is None and attempts > 0: | |
try: | |
data = device.read(endpoint.bEndpointAddress, | |
endpoint.wMaxPacketSize) | |
except usb.core.USBError as e: | |
data = None | |
if e.args == ('Operation timed out',): | |
attempts -= 1 | |
continue | |
#print (data) | |
mass = data[5]*256+data[4] | |
sum += mass | |
masses.append(mass) | |
#print("mass=",mass) | |
print("masses=",masses) | |
print("sum=",sum) | |
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