OWFS seems a little slow lately so I thought I would share my 1wire relay
interface. Its just some relay boards mounted on a perspex plate however it
also provides 12VDC wiring and ready to connect field devices via terminals.
The design allows for easy fault finding in the future if anything were to
go wrong. i.e. simple plug and play between the relays and DS2408 chip. As
the opto isolated relay board has all the pull up resistors and works on low
= on and high = off it works great with no other components required.
DS2408 mounted in small case
http://img.photobucket.com/albums/v319/rjconway/1wire-2.jpg
DS2408 Direct Connected to relay interface boards -Futurlec US15.00
http://img.photobucket.com/albums/v319/rjconway/1wire-1.jpg
Completed relay interface panel fully assembled.
http://img.photobucket.com/albums/v319/rjconway/1wirerelay-2.jpg
I had to place the relay boards on top of one another to save room
http://img.photobucket.com/albums/v319/rjconway/1wirerelay-1.jpg
This board is for my latest aquarium. I hope to change the design once the
new 1wire BAE0910 for heater and cooling control is delivered however first
up will be simple 1wire relay controls. My plan is to test the temperature
controls with simple on off control then move onto how much better I can
achieve using pwm fan speed control. As I trend ambient and tank
temperature I should be able to get some good comparisons. Naturally PWM
control should provide better stability however it will be a good exercise
to document.
rob
Australia
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