Electronics > Beginners
Help required with Thermostatic Mixer customization
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Martichoke:
I recently purchased a digital thermostatic mixer for my upcoming bathroom renovations.

The thermostatic mixer has a small console that controls temp adjustment to the mixer.
the mixer is just like a faucet mixer but controlled with a stepper motor.
The console has temperature control and temp display. The temp control buttons are also touch sensitive.

My plan is to have a Faucet and a N.O. latching Piezoelectric switch controlling a slow close water valve to allow or not allow water flow.
With another 2 N.O momentary Piezo switches to control temp adjustment (I like the aesthetic look of buttons and not the console)
I basically want the temp and water flow controlled from 3 piezo switches and the console hidden or not installed.

I did a tear down of the mixer and found 4 cables running to the console, 5vdc (red), GRND (Black), CLK (yellow) and DAT (blue). Pictured*
I measured the voltage down to ground and played with the touch buttons on the console to monitor any voltage change.
There is a constant 2.9v to yellow and 2.0v to DAT with basically no voltage change when adjusting temp.

I need help with trying to achieve adjusting the temp with a couple of simple N.O switches (hotter and colder).
Any suggestions are very appreciated.
Ian.M:
It uses some sort of clocked serial bus.   You'll need a DSO with protocol decoding to make any sense of it.   You *MAY* get there with a logic analyser and a lot of luck, but it will be a lot harder if you cant see the waveform risetimes to detect when the bus is being actively driven.   
Martichoke:

--- Quote from: Ian.M on April 29, 2018, 06:23:57 am ---It uses some sort of clocked serial bus.   You'll need a DSO with protocol decoding to make any sense of it.   You *MAY* get there with a logic analyser and a lot of luck, but it will be a lot harder if you cant see the waveform risetimes to detect when the bus is being actively driven.   

--- End quote ---

Thank you.
what is a DSO? My electronics is very limited.
Martichoke:
Do you think it might be worth doing a tear down of the console and trying to cut into the console touch buttons?
cowana:

--- Quote from: Martichoke on April 29, 2018, 07:58:27 am ---what is a DSO? My electronics is very limited.

--- End quote ---

A Digital Storage Oscilloscope. That may allow you to decode the control format (data/clock), and then 'spoof' it from your own controller.
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