If I reverse the clock and data channels it still doesn't output errors, so it's hard to say if the decoder is outputting the actual data or just noise. I'm not sure if its decoding correctly either as it doesn't give any frame errors the way the uart decoder does. It also doesn't seem like the framing of D1 and D0 align.
Hot tub control panel serial#
I tried decoding as a UART, but it doesn't seem to be a serial signal as there are many frame errors no matter what baud rate I use. I logged the signal with Sigrok pulseview and found that there is a constant signal being sent/received, regardless of whether the tub is running or idle. There are four wires, 16v power, ground and two signal/communication wires. If this assumption is true, then the temperature must be sent from the main panel to the top side panel, and the top side panel is telling the main panel when to turn on the heat, water pump, jets, etc. The top side panel is an L-50 and is potted so I cannot really examine the circuit, however I have observed that if I unplug the control panel from the main panel, the pump and heater shut off - which indicates to me that the top side panel is what is actually doing the temperature monitoring and control. I cannot tell what the microprocessors are as there is no writing on them, but it appears that the same 28 pin chip was used in both the control panel and main board. The top side control panel plugs into the main control panel with a 4 wire RJ style jack. Disconnect the electric and component cords from control system (pump, blower, etc.). The spaside control panel, its just a convenient way to turn things on and off, and view equipment status lights and water temperature. The tub is an older (early/mid 2000s) Vita Spa. Disconnect incoming power cord from equipment system. And thats all the topside control is - a control panel, think of it as a remote control for your hot tub, wired into your spa controller, which is really the brains of the spa system. You can confirm your spa is on and ready from a distance – a real advantage, especially in winter.I am trying to reverse engineer the control signal that my hot tub's top side control panel uses to communicate with the main panel which controls the heater, water pump, etc. The HotSpring logo’d Power on/ready indicator light, located on the cabinet front, is visible even with the spa cover in place.
Hot tub control panel free#
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