← index #8325Issue #1987
Off-topic · high · value 1.631
QUERY · ISSUE

MicroPython OneWire protocol BUG?

openby beyonloopened 2022-02-18updated 2024-09-08
enhancement

Hello!

I'm using the onewire CI DS28E05 (https://datasheets.maximintegrated.com/en/ds/DS28E05.pdf) but Micropython ow.scan() show nothing. That is a onewire chip, so it use/works with the onewire protocol, of course. Well, if it is onewire protocol, the CI address need to be shown on the ow.scan() right?

>>> os.uname()
(sysname='esp32', nodename='esp32', release='1.18.0', version='v1.18 on 2022-01-17', machine='ESP32 module (spiram) with ESP32')
>>> from machine import Pin
>>> import onewire
>>> ow = onewire.OneWire(Pin(25))
>>> ow.scan()
[]
>>>

Just to you know that onewire pin are working, if I use another onewire chip, the DS18b20 CI, it shows the address on the ow.scan() as follow bellow:


>>> os.uname()
(sysname='esp32', nodename='esp32', release='1.18.0', version='v1.18 on 2022-01-17', machine='ESP32 module (spiram) with ESP32')
>>> from machine import Pin
>>> import onewire
>>> ow = onewire.OneWire(Pin(25))
>>> ow.scan()
[bytearray(b'(\xa7I\xf0\x0c\x00\x00\x17')]
>>>

Any idea what is wrong? Is it a MicroPython OneWire protocol BUG or what I need to do to works the ow.scan()?

Thank you in advance.

CANDIDATE · ISSUE

esp8266 - onewire missing

closedby doudzopened 2016-04-17updated 2016-06-05
port-esp8266

onewire seems missing in the last esp8266 build since I got "no module named onewire" trying to "import onewire"

Keyboard

j / / n
next pair
k / / p
previous pair
1 / / h
show query pane
2 / / l
show candidate pane
c
copy suggested comment
r
toggle reasoning
g i
go to index
?
show this help
esc
close overlays

press ? or esc to close

copied