newbie - is this sketch OK ?

[morglum]

Hey everyone,

This is my first foray in the 1-wire device world. I'd like to do the following simple thing to get started:


Use an unslung NSLU2 with a DS9490R usb to 1-wire adapter. (software will be figured out later)
Figure out what the indoor temperature is, using a DS18S20 temperature sensor
If temperature is below X degrees, use a DS2413 switch controlling a relay to turn a load on , for example a baseboard heater.

I've attached a sketch, can you guys give a look to tell me if I'm missing something? I didnt put any diode/resistor because I have no idea where they would go.
Hey everyone,

This is my first foray in the 1-wire device world. I'd like to do the following simple thing to get started:


Use an unslung NSLU2 with a DS9490R usb to 1-wire adapter. (software will be figured out later)
Figure out what the indoor temperature is, using a DS18S20 temperature sensor
If temperature is below X degrees, use a DS2413 switch controlling a relay to turn a load on , for example a baseboard heater.

I've attached a sketch, can you guys give a look to tell me if I'm missing something? I didnt put any diode/resistor because I have no idea where they would go.
***ahh damn i can't post links as a newbie -- PM for sketch ?***


Thanks !


Any suggestion would be greatly appreciated.

Thanks !


Any suggestion would be greatly appreciated.

 

[pete_c]

Its easy and personally using 1-wire has worked for me for about 10 years now.

Mitch from Midon Design has written a nice overview of 1-Wire topologies, use, etc. Have a look at it as it will answer most if not all of your questions.

1-Wire Application Guide

Personally I have a mix of both star and bus topologies and utilize four 1-wire networks. I also utilize parasitic power on three of the four networks.

 

[morglum]

Its easy and personally using 1-wire has worked for me for about 10 years now.

Mitch from Midon Design has written a nice overview of 1-Wire topologies, use, etc. Have a look at it as it will answer most if not all of your questions.


Personally I have a mix of both star and bus topologies and utilize four 1-wire networks. I also utilize parasitic power on three of the four networks.

Reading, will be basck with more questions later on

 

[morglum]

Its easy and personally using 1-wire has worked for me for about 10 years now.

Mitch from Midon Design has written a nice overview of 1-Wire topologies, use, etc. Have a look at it as it will answer most if not all of your questions.


Personally I have a mix of both star and bus topologies and utilize four 1-wire networks. I also utilize parasitic power on three of the four networks.

Reading, will be basck with more questions later on

Thanks for the link, it was useful.

However, I'm still very unsure how to drive a relay using my DS2413.
Is it simply NSLU2--DS2413- sinking to--Relay-- grounded to nslu2

Or do I need transistors/diodes/resistors somewhere? Attached is a sketch of what I understand..

 

[midon]

However, I'm still very unsure how to drive a relay using my DS2413.
Is it simply NSLU2--DS2413- sinking to--Relay-- grounded to nslu2

Or do I need transistors/diodes/resistors somewhere? Attached is a sketch of what I understand..

Have a look at the TEMP08 FAQ, question 29: TEMP08 FAQ?

The DS2405 and DS2413 are similar in their PIO port.

Mitch

 

[morglum]

However, I'm still very unsure how to drive a relay using my DS2413.
Is it simply NSLU2--DS2413- sinking to--Relay-- grounded to nslu2

Or do I need transistors/diodes/resistors somewhere? Attached is a sketch of what I understand..

Have a look at the TEMP08 FAQ, question 29: TEMP08 FAQ?

The DS2405 and DS2413 are similar in their PIO port.

Mitch

Hi Mitch;

Thanks for the link, thats exactl what I was loking for.

Do I need to put these exact transistors in there, or is there some possibility for substitution? Thanks!

 

[morglum]

However, I'm still very unsure how to drive a relay using my DS2413.
Is it simply NSLU2--DS2413- sinking to--Relay-- grounded to nslu2

Or do I need transistors/diodes/resistors somewhere? Attached is a sketch of what I understand..

Have a look at the TEMP08 FAQ, question 29: TEMP08 FAQ?

The DS2405 and DS2413 are similar in their PIO port.

Mitch

Hey Mitch,

I received all my parts and now I have to admit I am puzzled when I look at the scheme on your faq.

Q1) Can I just connect it like this? ds2405 sketch
Q2) Also, the DataSheet says I need a pull-up resistor. Yet, I dont see one in your/the other guy's sketch. Do I need one?

Thanks