Hi everyone !
I am a complete rookie in both the Arduino and the electronics in general, coming right from the programming world. The only part I feel at ease with right now is the sketches coding ;).
That’s it for who I am, since this is my first post in this forum :). I hope I will chose my words right, at least I will try to.
Now, about my project. I am looking for a way to add remote-controlled capabilities to my spa. It seems to be quite straight forward (with the appropriate knowledge :)) as the actual keypad communicates with the internal motherboard using a 4-pin cable (VDD, RX, TX, GND).
My newbie assumption is that I should be able to use the Arduino Uno I own as a man-in-the-middle to be able to do both read and write operations over the signal.
Does someone know how I would be able to translate the multiplexed signal coming from the spa motherboard and also generate the appropriate signals to increase/decrease the temperature, or set the pump or the bubbles on/off.
I already checked that the VDD pin is providing a 5V+ current, and I was able to read an analog signal using the RX/TX pins of the Arduino Uno.
I attach some pictures of the controller PCB. The chip in the middle is labelled PIC16F723A.
Can anyone help me, I am eager to learn more about this new stuff :).