Iq2020 Control Over The Internet

[tomgobravo]

To save power and as a fun project I'd like to make a remote interface for my 2005 Hot Spring Sovereign so I can adjust the temperature from my phone. It has an IQ2020 controller which has an i2c interface. Do you know how I can get a manual documenting this interface? Or is there someone in the SF Bay Area with a Navigator RF Remote which I can watch operate using a Saleae logic analyzer? Can you help in any other way?

So far I've been decoding the messages on the bus using a python script, but it will take a while to work out enough of the bits to have confidence to start sending messages back. I'm guessing the controller reads from the remote on 7-bit address 18, 3E, 36, or 44. I've only seen the remotes on sale for >$400, pricy given that I expect the parts for a wireless internet remote to be under $100. I understand that I am likely voiding the warranty but suspect fiddling with i2c is fairly low risk of damage beyond what can be fixed by power cycling or replacing the controller board.

I found a similar thread from years ago, but it seems to have died.

Thanks!

[tomgobravo]

Instead of decoding the i2c I'm now turning my tub on and off from my phone by putting an additional resistive load across the thermometer port. This isn't very fancy but works pretty well. You can read some of the technical details at https://github.com/TomGoBravo/tub

[RyanS107]

Sounds like an awesome idea. I am very interested in your progress. So far I only have a Weather Direct Temperature sensor to be able to get alerts if the temperature changes, but that isnt going directly into the circuit board. Let me know what you are able to come up with for controlling it over the internet.

[mdejager]

Hi Newbie,

Is your system with a resistive load working still working? I also would like to change termpature with home domotica.

Could you draw a diagram for me and/or send me a picture of how you set it up?

Do you know what would happen if I put an on/off controller in between one of the temperature cables?

and switch it of. Probably the spa things the sensor is broken or something.. but does it stop heating then. and if so what happens if the cable is 'connected' again.

Like to hear from you.

ciao,

Martijn