Spa Controller

Author Message

Joined: 24/12/2017
Location: Australia
Posts: 507
Posted: 06:57pm 02 Dec 2019      

Thanks for that Phil23. The circuit is similar to that posted by Tinine but the 27uS delay has been extended out to over 5mS! It looks like a good device, well protected  and documented.

Considering that I bought the MAX485 chip locally for $5.95 the price is good too.

I have used one of these devices on my laptop to talk to RS485 devices using DOS MMBasic. It must use a similar automatic direction control.

Keep safe. Live long and prosper.