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convert ds18b20 serial number
Posted: Sat Aug 12, 2017 8:04 pm
by c.man
Hi,
I'm running a code for temperature acquisition (with digital sensor ds18b20)
Code: Select all
import time
import machine
import onewire, ds18x20
# the device is on GPIO12
dat = machine.Pin(12)
# create the onewire object
ds = ds18x20.DS18X20(onewire.OneWire(dat))
# scan for devices on the bus
roms = ds.scan()
print('found devices:', roms)
# loop 10 times and print all temperatures
for i in range(10):
print('temperatures:', end=' ')
ds.convert_temp()
time.sleep_ms(750)
for rom in roms:
print(ds.read_temp(rom), end=' ')
print()
in output I have:
Code: Select all
found devices: [bytearray(b'(\xb4\x95f\x05\x00\x00\x0c')]
temperatures: 27.25
temperatures: 27.25
temperatures: 27.25
temperatures: 27.25
temperatures: 27.25
temperatures: 27.25
temperatures: 27.25
temperatures: 27.25
temperatures: 27.25
temperatures: 27.25
I want to convert devices from bytearray in string (in ubuntu/raspberry I have "28-0000056695b4").
How I to do ?
Re: convert ds18b20 serial number
Posted: Sat Aug 12, 2017 11:19 pm
by deshipu
Code: Select all
>>> hex(int.from_bytes(b'(\xb4\x95f\x05\x00\x00\x0c', 'little'))
'0xc0000056695b428'
Re: convert ds18b20 serial number
Posted: Sun Aug 13, 2017 6:09 am
by c.man
thanks !
Re: convert ds18b20 serial number
Posted: Sat Mar 03, 2018 9:54 am
by ajocius
How to add this to the code? Testing this sensor as well.
print('found devices:', hex(int.from_bytes(b'(roms', 'little'))))
does not work
Re: convert ds18b20 serial number
Posted: Fri May 17, 2019 9:00 am
by navy
ajocius wrote: ↑Sat Mar 03, 2018 9:54 am
How to add this to the code? Testing this sensor as well.
print('found devices:', hex(int.from_bytes(b'(roms', 'little'))))
does not work
roms is an array so you should use it like this:
Code: Select all
roms = ds.scan()
print('found devices:', roms)
#serialnum = hex(int.from_bytes(roms[0], 'little'))
#print('serial:', serialnum)
or in example loop:
Code: Select all
for i in range(5):
print('temperatures:', end=' ')
ds.convert_temp()
time.sleep_ms(750)
for rom in roms:
serialnum = hex(int.from_bytes(rom, 'little'))
print('sensor #', serialnum)
print(ds.read_temp(rom), end=' ')
print()
Re: convert ds18b20 serial number
Posted: Fri May 17, 2019 6:37 pm
by kevinkk525
Always funny when someone revives a thread that is a year old
The solution of converting a rom to string is quite simple: ''.join('%02X' % i for i in iter(rom))
Re: convert ds18b20 serial number
Posted: Fri Jun 19, 2020 9:20 pm
by BigStupidBeast
kevinkk525 wrote: ↑Fri May 17, 2019 6:37 pm
Always funny when someone revives a thread that is a year old
The solution of converting a rom to string is quite simple: ''.join('%02X' % i for i in iter(rom))
Every year some nube like me ask something like
Can you take some sample of code? Pleeeeeesssee
Re: convert ds18b20 serial number
Posted: Sat Jun 20, 2020 9:58 am
by kevinkk525