Jump to content
  • 0

sensor gpio


hannibal1986
 Share

Question

I have the temperature sensor DS18B20 connected to port 20 of the gpio as w1, if I want to connect another sensor it is as easy as adding a w2 and its port in /boot/bin/orangepiplus2e.bin

[w1_para]
w1_used = 1
gpio = 20

[w2_para]
w2_used = 1
gpio = 10

 

or

 

[w1_para]
w1_used = 1
gpio = 20

gpio = 10

 

So or something else? thanks

Link to comment
Share on other sites

6 answers to this question

Recommended Posts

Armbian is a community driven open source project. Do you like to contribute your code?

  • 0

Onewire does have limitations on bus capacitance and length.  When using multiple sensors on one interface, it is best to not have stubs, wire to one sensor then the next rather than both from the pi.  You are also more likely to need to power your sensors rather than have them just on the bus.

 

Link to comment
Share on other sites

  • 0

...but the 3.4.x legacy kernel has a limitation - you won't be able to instantiate more than one 1-wire bus without patching and recompiling the kernel.

Linear or star topology, not using parasite power, pull-up resistor value are details that would need to be adjusted for better reliability or even to make things work to start with.

I would recommend reading this application note: https://www.maximintegrated.com/en/app-notes/index.mvp/id/148

Link to comment
Share on other sites

Guest
This topic is now closed to further replies.
 Share

×
×
  • Create New...