Home
JAQForum Ver 24.01
Log In or Join  
Active Topics
Local Time 06:38 07 Jul 2025 Privacy Policy
Jump to

Notice. New forum software under development. It's going to miss a few functions and look a bit ugly for a while, but I'm working on it full time now as the old forum was too unstable. Couple days, all good. If you notice any issues, please contact me.

Forum Index : Microcontroller and PC projects : Multiple DS18B20 on single pin

Author Message
jtelectron
Newbie

Joined: 19/06/2016
Location: Australia
Posts: 2
Posted: 03:27pm 28 Jun 2016
Copy link to clipboard 
Print this post


Hi everyone,
Can somebody explain what seems to me a problem:-
Connection of Multiple DSB1820 on a single pin.
I have an unusual need to connect 15 of these devices on 1 bus
in 3 wire mode.
Realising the need to reduce the 4.8k pullup resistor in value.
Most people seem to indicate that there are problems in coding
and implementing this method[The MicroMite provides for 1 pin/device]
 
Phil23
Guru

Joined: 27/03/2016
Location: Australia
Posts: 1667
Posted: 05:51pm 28 Jun 2016
Copy link to clipboard 
Print this post

  jtelectron said  
Hi everyone,
Can somebody explain what seems to me a problem:-
Connection of Multiple DSB1820 on a single pin.
I have an unusual need to connect 15 of these devices on 1 bus
in 3 wire mode.
Realising the need to reduce the 4.8k pullup resistor in value.
Most people seem to indicate that there are problems in coding
and implementing this method[The MicroMite provides for 1 pin/device]


Hi JTE,

You might like to look thru some of my posts.
This thread is one of the more recent updates.

I've wanted all my temp sensors for a couple of projects on a single bus & pin and am doing just that successfully.

You should be able to find the code I've posted.

I use one piece of code to extract the serial numbers from individual devices.
(At this stage I need to connect them ONE AT A TIME, & copy the numbers down).

Then my main application just uses those serial numbers to address the sensors.

One project currently has 4 on a daisy chain bus, the other has them all star connected at a central point.

Both are still using a 4.7k pull-up.

Chers

Phil


 
jtelectron
Newbie

Joined: 19/06/2016
Location: Australia
Posts: 2
Posted: 01:50pm 29 Jun 2016
Copy link to clipboard 
Print this post

Thanks Phil,
I will do my best to understand your
code and thanks all for your help!!
 
Print this page


To reply to this topic, you need to log in.

The Back Shed's forum code is written, and hosted, in Australia.
© JAQ Software 2025