Hi
On 5 August 2018 at 20:09, Rowan Sylvester-Bradley
<ro...@sylvesterbradley.org> wrote:
If I switch to Raspberry Pi, how do I then connect the OneWire bus to the Pi?
Can I still use the DS9490R, or do I have to use some more hardwary way,
connecting to GPIO pins or something?
IMO, the better solution is to use I2C-1Wire adapters like the wonderful DS2484
which allowing a 5V 1-wire bus for better performances directly connected to
the 3.3V *PI's GPIO.For a large network, DS2482-800 provides 8 1-wire buses but
if you want a 5V 1-wire bus, you need an external level converter.More
information on this page (in French) : Connexion à un bus 1-wire
| |
Connexion à un bus 1-wire
|
It's for a BananaPI but it's applying also to any Raspberry GPIO compatible SBC
(OrangePI, ...) .
Unlink using directly GPIO, ds24* provide :- strong pullup for a better
handling of parasitic power probe- protect your *PI versus electrostatic
discharge (ESD)- free your CPU for managing 1-wire protocol (I2C is managed in
the hardware of SBC CPU, unlike 1-wire).
Bye
Laurent
PS: why 5V ? as per Maxim's application note, it provides better conversion
quality and reduces line noises.
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