Automatic restart of the 1-Wire bus

zorro_66

I use a Unipi light and would like to use the function automatic reset 1-wire bus where do I find the variable OW_off_1.
The manual for this function is very poor

Martin Kudláček

Hello @zorro_66 , the restart of the 1-Wire bus is not available on the UniPi 1.1.

zorro_66

Ok thanks for the answer.
How many sensors can a Unipi light handle.
I have connected 15 sensors now and the 1-wire bus stops after about 5 hours and requires a reset to work again.

Martin Kudláček

Hello @zorro_66,
the problem with 1-Wire bus is, that there are no guarantees about its functionality. You may have 10 sensors on 100m bus working just fine and you can have 5 sensors on 20m that will not work at all.

The general guidelines are:

Avoid stub and star topology (e.g. use our 4 wire sensors)
Use shielded cable and don't lay the cable along the 230V power lines

For more detailed information, try reading this paper from Maxim: https://www.maximintegrated.com/en/app-notes/index.mvp/id/148

Best regards,
Martin